Free Online Tools & Calculators

Board Foot Calculator Board feet, weight, cost, and species data for woodworkers 205 Closing Cost Calculator Estimate your total closing costs before you sign 217 Concrete Calculator Calculate concrete volume for slabs, footings, columns, and more 188 Decking Calculator Every material for your deck build, from boards to footings 694 Drywall Calculator Calculate sheets, tape, mud, screws, and corner bead for any room 207 Fence Calculator Calculate posts, rails, pickets, and concrete for any fence project 170 Flooring Calculator Estimate materials & cost for any flooring project 184 Frost Dates & Planting Planner Your real last/first frost dates from 30 years of data, plus 40-crop sow windows 4 Gas vs Electric Appliance Calculator Real state energy prices for gas vs electric appliance cost comparison 564 HELOC Payment Simulator See the payment shock before you sign: draw period vs repayment modeling 409 Home Affordability Calculator Find out how much house you can actually afford 206 Home Equity Calculator See how much equity you've built and your borrowing power 191 Home Equity Loan Comparison Compare HELOC, cash-out refi, and personal loans side by side 196 Home Insurance Coverage Calculator Calculate your true replacement cost and coverage needs 175 Home Sale Proceeds Calculator The seller's net sheet: what you actually walk away with at closing. 1 Home Systems Lifespan & Replacement Budget The monthly number that stops repairs becoming emergencies 2 Homebuyer Readiness Score Score your readiness to buy across five key pillars 151 Investment Property Analyzer Analyze rental deals with BRRRR and buy-hold models 164 Landscape Material Calculator Cubic yards, weight, and bag count for any landscaping material 299 Mortgage Payment Calculator Calculate your monthly mortgage payment with taxes and insurance 283 Mortgage Refinance Calculator Know your break-even date before you refinance your mortgage 129 Moving Cost Estimator Get a realistic estimate for your upcoming move — local or cross-country 185 Paint Calculator Calculate exactly how much paint you need for any room 161 Property Hazard Risk Profiler FEMA hazard scores, live weather alerts, and earthquake history for any US address 3 Property Tax Estimator Estimate your annual property taxes and monthly escrow impact 166 Renovation ROI Calculator Find out which home improvements actually pay for themselves 197 Rent Increase Reality Check Is your rent increase normal, legal, negotiable? Answered with the official numbers. 1 Rent vs. Buy Calculator Find out whether renting or buying saves you more over time 196 Rental Profit Calculator Find out if your short-term rental will actually make money after all expenses 181 Roofing Calculator Calculate squares, bundles & materials by pitch 618 Solar Savings Calculator See if solar panels are worth it for your home and how fast they pay for themselves 839 Stair Calculator Design code-compliant stairs with the right rise, run, and materials 155 Tile Calculator Exact tile, grout, and adhesive quantities for any layout pattern 180 Tree Canopy Shade Calculator Shadow length and shaded area by season and latitude 1,857 Tree Pruning Calendar Species-aware pruning windows for 40+ trees 153 Tree Watering Calculator Weekly gallon targets by trunk size, age & season 1,010 Wallpaper Calculator Get the exact number of wallpaper rolls with pattern repeat math 162

Air Quality & Exercise Planner Live AQI turned into a workout decision: run, shorten, or move it indoors 4 BAC Calculator Estimate your blood alcohol content based on drinks, weight, and time 228 Biological Age Calculator Discover your body's real age based on your lifestyle 255 Blood Pressure Calculator Understand your blood pressure reading with clinical context 193 BMI Calculator Calculate your Body Mass Index and understand what it means 269 Body Fat Calculator Estimate your body fat percentage using Navy, circumference, or skinfold methods 201 Caffeine Calculator Calculate your safe daily caffeine limit and track intake 189 Calories Burned Calculator Calories burned by activity & duration 849 Chocolate Toxicity Calculator for Dogs Find out if the chocolate your dog ate is dangerous -- fast 765 Dog Food Calculator Precise daily feeding portions based on your dog's needs 235 Dog Years Calculator Convert your dog's age to human years using modern veterinary science 181 Due Date Calculator Calculate your estimated due date and track key pregnancy milestones 187 Fasting Calculator Plan your intermittent fasting schedule and see when your body enters each metabolic zone 217 Heart Rate Zone Calculator Karvonen training zones with honest error bars, not false precision. 1 Heat Index & Exertion Safety Planner The WBGT number coaches and OSHA actually use 2 Hospital Quality Lookup CMS star ratings and safety records for the hospitals near any ZIP 5 Keto Calculator Calculate your personalized keto macro targets for fat, protein, and carbs 161 Life Expectancy Calculator See how your lifestyle choices impact your projected lifespan 1,302 Macro & Calorie Calculator Find your daily calories and macros based on your body and goals 292 Medication Label & Side-Effect Explorer FDA label warnings, real-world side-effect reports, and active recalls for any US drug 3 Nutrition Label Analyzer Instant health grade and nutrition breakdown for any packaged food 129 One-Rep Max Calculator Estimate your one-rep max and plan your training percentages 175 Ovulation Calculator Your fertile window with honest uncertainty -- a six-day window, not one fake-precise day. 1 Pace & Race Time Calculator Find your pace, finish time, or distance — with splits for every mile 201 Pregnancy Weight Gain Calculator Track recommended weight gain week by week through pregnancy 170 Protein Per Dollar Calculator Rank any food by protein grams per dollar with live USDA data 1,249 Recovery & Readiness Score Get a 0-100 readiness score to know when to push and when to rest 189 Sleep Cycle Calculator Find the best times to sleep and wake based on your sleep cycles 180 Steps to Distance Calculator Convert your step count into miles, kilometers, and calories burned 189 Supplement Stack Analyzer Check your supplement stack for interactions, overlaps, and optimal timing 207 TDEE Calculator Find your daily calorie target based on your body and activity level 234 Training Plan Builder Generate a progressive multi-week training plan for any goal 180 UV Exposure & Vitamin D Planner Live UV index, time-to-sunburn for your skin type, and minutes needed for vitamin D 7 VO2 Max Calculator Estimate your VO2 max and cardio fitness age with four test protocols 190 Water Intake Calculator Personalized daily hydration guide 222

1099 vs W-2 Calculator Compare your real take-home pay as a contractor versus an employee 226 ACA Subsidy & Self-Employed Health Coverage Estimator What a marketplace plan really costs after the tax credit 2 AdSense Revenue Calculator Estimate AdSense revenue by traffic, niche, and ad density 1,503 Break-Even Calculator Find out exactly how many units you need to sell before you profit 268 Business Valuation Calculator Estimate your business value using four valuation methods 211 Cash Flow Forecaster Build a 12-month rolling cash flow model with danger zone alerts 189 Client Profitability Scorecard Score up to 8 clients by profitability, effort, and relationship quality 174 Commission Calculator Calculate sales commission for flat, tiered, and accelerator structures 223 CTR Calculator Calculate Click-Through Rate and compare it to industry benchmarks 169 Employee Cost Calculator Calculate the true total cost of hiring an employee beyond salary 406 Freelance Rate Calculator Find your ideal hourly rate based on your income goals 251 Influencer ROI Calculator Measure the true ROI of your influencer marketing campaigns 193 Instagram Engagement Calculator Calculate engagement rate & compare benchmarks 196 Invoice Calculator Build line items, apply discounts and tax, and see your invoice total 200 Margin & Markup Calculator Convert between margin and markup instantly — and find your ideal price 203 Meeting Cost Calculator Watch your meeting cost tick up in real time 166 Mileage Deduction Calculator The 2026 mid-year rate split (72.5c then 76c) computed correctly -- most tools are quietly wrong this year. 1 Per-Diem & Mileage Lookup GSA lodging + M&IE for any US city and date, plus 2026 IRS mileage rates 8 Project Estimator Estimate project timelines and costs with confidence 169 Proposal Win-Rate & Pricing Analyzer Find your sweet spot pricing and improve your proposal win rate 1,721 Quarterly Tax Estimator Calculate your estimated quarterly tax payments and avoid penalties 172 ROAS Calculator Calculate your Return on Ad Spend and see if your campaigns are profitable 159 S-Corp vs LLC Tax Savings Calculator Does the S-Corp election actually save you money? The whole computation, QBI included. 1 SaaS Pricing Calculator Model your SaaS pricing tiers and project recurring revenue 201 Salary & Hourly Converter Convert between salary and hourly rate — see what you really earn 198 Salary Percentile Calculator Government wage data to know if you're paid fairly by occupation and state 1,178 Startup Runway Calculator See how long your cash lasts and when you need to raise or profit 203 TikTok Engagement Rate Calculator Measure TikTok video performance against niche benchmarks 224 YouTube Earnings Calculator Estimate YouTube ad revenue by views, niche, and audience geography 216

Age & Date Calculator Calculate exact age, date differences, and countdowns 224 Electrical Power Calculator Calculate watts, kVA, HP, motor starting, and amperage 189 Electricity Cost Calculator See how much any appliance or device costs you to run. 213 Event Weather Odds Planner 30 years of real weather for any calendar date: rain odds, temps, and records 4 Flight Delay & Airport Status Checker Live FAA ground stops, delay programs and the real cause, for any US airport 4 Generator Wattage Calculator Size your generator by checking off what you need to power 193 GPA Calculator Weighted, unweighted, cumulative -- and what you need next semester to hit your target. 3 Loan Comparison Engine Compare up to 4 loans side by side with amortization curves 168 Net Worth Tracker & Analyzer Calculate your net worth with percentile ranking by age 268 Percentage Calculator Solve any percentage problem instantly — three modes, one tool 238 Real Hourly Wage Calculator Discover what you really earn per hour after all work costs 168 Recall Radar One search across CPSC, FDA food & drug, and NHTSA vehicle recalls 2 Retirement Readiness Calculator Find out if you will have enough to retire comfortably 209 Sales Tax Calculator Calculate sales tax for any US state with reverse tax mode 206 Subscription Audit Calculator Track all your subscriptions and find what to cut 227 Subscription Tracker Calculator Reveal the true cost of subscription creep 230 Time Card & Overtime Calculator Weekly hours and gross pay computed the way payroll actually computes them. 1 Tip Calculator Calculate the right tip and split the bill easily. 327 Travel Budget Calculator Live exchange rates for multi-destination trip budgeting 157 Unit Converter Convert between any units of measurement instantly 220

AI Content Detector Analyze text to estimate whether it was written by AI or a human 232 AI Grammar Checker Check grammar, punctuation, spelling, and style instantly 288 Bio & About Page Generator Generate 5 professional bio formats instantly as you type 181 Brand Voice & Tone Analyzer Analyze your writing style across six voice dimensions 164 Case Converter Convert text between 10 naming conventions in one click 188 Citation Generator Paste an ISBN, DOI or URL — get all four styles 3 Cold Email & Outreach Scorer Get a brutally honest 0-100 score on your cold emails 156 Content Brief Builder Generate structured SEO content briefs with outlines and titles 160 Email Signature Generator Signature HTML that survives Outlook -- previewed in light AND dark inboxes. 2 Email Subject Line Tester Score your email subject lines for open rates before you hit send. 188 Headline Analyzer Score your headlines for clicks, engagement, and emotional impact 258 Invisible Character Remover Detect and remove hidden Unicode characters from text 223 Jargon Ipsum Generator Generate hilarious profession-themed placeholder text 176 Markdown Editor Write, preview, and convert Markdown with live rendering. 184 Meta Tag Analyzer Generate and preview meta tags for Google and social media 167 Reading Level Analyzer Analyze your text's reading level with multiple scoring methods 270 Schema Markup Generator Generate JSON-LD structured data for Google rich results 160 SEO Content Analyzer Optimize your content for search engines with actionable scoring. 185 Social Media Optimizer Optimize your posts for every platform with character counts and scoring. 182 Speech Timer & Teleprompter Words to minutes done honestly -- then read it off a real teleprompter. 2 Text Diff Tool Compare two texts side by side and see every difference highlighted. 181 Word & Character Counter Count words, characters, and reading time as you type 246

AI Token Calculator Count tokens and estimate API costs for any AI model. 191 Color Converter & Palette Generator Convert colors between formats and generate harmonious palettes 205 Cron Expression Builder Build and decode cron expressions with a visual schedule editor. 189 CSS Generator Generate beautiful CSS gradients, shadows, and glassmorphism effects. 203 Dependency CVE Checker Paste a package.json, requirements.txt or composer.json and see every known CVE 2 Design Token & Color System Generator Generate complete design systems from a single brand color 188 DNS Lookup Query and inspect all DNS records for any domain instantly 168 DNS Propagation Checker One record checked across 5 resolvers plus the authoritative NS, with live TTLs 4 Email Deliverability Analyzer SPF, DKIM, DMARC, and MX records fetched, parsed, and graded — with copy-paste fixes 3 Encoding Toolkit Encode, decode, and convert between Base64, URL, HTML, and more. 171 Hash Generator Generate MD5, SHA-1, SHA-256, and SHA-512 hashes instantly 174 HTML Cleaner & Formatter Clean messy HTML from Word, Google Docs, and CMS editors 166 HTTP Security Header Grader Audit your HTTP security headers with A-F grades per category 161 IP Subnet Calculator Calculate subnet details from any IP/CIDR notation 149 Is It Down? Website Checker Down for everyone or just you -- answered layer by layer, not with a shrug. 2 JSON Formatter & Validator Format, validate, and explore JSON with instant error detection 208 JWT Decoder Decode, inspect, and validate JSON Web Tokens instantly. 169 Link Building Cost Calculator Estimate link building costs by DA, niche, and link type 172 Meta Tag Generator Generate SEO meta tags, Open Graph, and Twitter Cards with live previews 142 QR Code Generator Generate customizable QR codes for URLs, WiFi, contacts, and more 155 Regex Tester Build and test regular expressions with live match highlighting 192 Robots.txt Generator Build and validate robots.txt files visually 159 SQL Formatter Format and beautify SQL queries instantly 147 SQL Query Builder & Explainer Build SQL visually or paste queries for plain-English explanations 187 SSL Certificate & Expiry Monitor Read any site's certificate off a live TLS handshake, with a days-to-expiry countdown 2 Unix Timestamp Converter Paste anything -- it detects the format and converts every direction. 3 UUID Generator Generate, validate, and format UUIDs instantly 169 XML Sitemap Generator Generate valid XML sitemaps with URL validation and smart splitting 178

Air Fryer Converter Convert oven recipes to air fryer settings instantly. 213 Baking Substitution Finder Find ingredient swaps with exact ratios and effectiveness ratings 192 BBQ & Smoking Calculator Estimate cook times, temps, and servings for any smoked meat 194 Brining Calculator Wet, dry, and equilibrium brine math with salt-type and cure-salt support 89 Coffee Brew Method Calculator Coffee dose, water temp, grind size, and brew timing for every brewing method 66 Cooking Oil Selector Pick the right cooking oil for the temperature, flavor, and fat profile you want 61 Cooking Unit Converter Convert cooking measurements with ingredient-aware accuracy 186 Fermentation & Pickle Brine Calculator Lacto-fermentation salt brine math with food-safety bounds and pH expectations 79 Grocery Basket Inflation Calculator Build your real grocery basket and see what it cost in any year — actual BLS price data 4 How Long Does It Last? Food Storage Guide 647 foods from USDA's own FoodKeeper data -- pantry, fridge and freezer, searchable. 1 Meat Roasting Calculator Get oven temps, cook times, and pull temps for any roast 208 Packaged Food Scanner & Comparator Scan a barcode, decode the product — Nutri-Score, processing class, additives — and compare two head-to-head 7 Pizza Dough Calculator Calculate exact dough ingredients using baker's percentages 191 Pizza Value Calculator Compare pizza sizes by price per square inch to find the best deal 1,784 Produce Seasonality & Peak-Freshness Finder What is actually in season where you live 5 Recipe Nutrition Calculator Calculate total and per-serving nutrition from any recipe 240 Recipe Scaler Scale any recipe up or down with smart kitchen-friendly rounding. 184 Smart Cooking Temperature Converter Convert oven temperatures with convection, altitude, and oven-calibration adjustments 40 Sourdough Baker's Math Calculator Full baker's percentage workbench with preferments, bulk timing, and reverse mode 62 Sous Vide Calculator Heat-up and pasteurization times for sous vide using Baldwin tables 207 Turkey & Big-Roast Timeline Planner The whole bird, scheduled backwards from the moment plates hit the table. 1 Yield & Trim Loss Calculator Edible yield percentages, true cost per edible pound, and how much raw to buy 66

401(k) Calculator Project your 401(k) growth with employer matching and compound returns. 204 Budget Calculator Allocate your paycheck with the 50/30/20 rule in seconds. 206 Capital Gains Tax Calculator The 0/15/20 stacking done correctly -- the same gain can owe $0 or $9,520. 2 CD Calculator Calculate CD earnings with compounding, penalties, and ladder strategies 170 College Cost & Payoff Comparator Real net price at your family income, plus earnings, debt, and completion 2 Compound Interest Calculator Visualize how your money grows with the power of compound interest. 297 Cost of Living Calculator Compare the true cost of living between any two cities. 272 Cost of Smoking Calculator See the true financial cost of smoking -- and what you could have instead 200 Credit Card Payoff Calculator See your debt-free date and the true cost of minimum payments. 184 DCA Backtest Calculator What $100 a week into Bitcoin or the S&P 500 actually did — real history, not assumed returns 2 Debt Payoff Planner Build a payoff plan and see how fast you can become debt-free. 260 Down Payment Calculator Plan your down payment with PMI analysis and a savings timeline 163 Emergency Fund Calculator Calculate your ideal emergency fund and savings plan 157 FIRE Calculator Financial independence retire early planner 173 Gas Price Tracker Live gas prices by state, crude oil trends, and your personal cost impact 1,930 Inflation Calculator See what your money was worth then — or will be worth in the future. 302 Pay Raise vs Inflation Calculator See whether your raise actually beat inflation using live CPI data 146 Paycheck & Take-Home Pay Calculator Salary to take-home for 2026, with real tables for all 50 states + DC. 1 Roth IRA Calculator Project Roth IRA growth and compare to Traditional IRA after taxes 181 Savings Goal Calculator Find out exactly how much to save each month to reach any financial goal 166 Social Security Claiming-Age Optimizer Claim at 62, 67 or 70? Run the real numbers 3 Student Loan Calculator Compare repayment plans and calculate payoff timeline 156 Treasury Bill Calculator Live Treasury yields with state tax advantage and CD comparison 365

AC Circuit Analyzer Impedance, resonance, Q factor, and Bode-plot filter design for RLC circuits 217 Aurora & Space Weather Forecast Will you see the northern lights tonight? Live Kp index and visibility odds for your location 3 Beam Deflection & Load Calculator Maximum deflection, stress, shear, and safety factor for common beam profiles and materials 135 Boiling Point Calculator Find the boiling point of water at any altitude or pressure. 256 Density Calculator Calculate density, mass, or volume with 100+ material database. 182 Fraction Calculator Exact fraction arithmetic with the steps shown -- no floating point anywhere. 1 Golden Hour & Light Planner Golden hour, blue hour, and twilight times with a cloud-based light-quality score 4 Graphing Calculator Plot and explore mathematical functions interactively 196 ISS & Satellite Pass Predictor See exactly when the space station crosses your sky 5 Matrix Workbench Determinant, inverse, eigenvalues, RREF, LU decomposition, and Ax=b solver 131 Ohm's Law Calculator Calculate voltage, current, resistance, and power instantly. 185 PID Tuner & Step Response Simulator Suggested Kp, Ki, Kd gains via Ziegler-Nichols, Cohen-Coon, and IMC with a live step plot 152 Pipe Flow & Pressure Drop Calculator Darcy-Weisbach and Hazen-Williams pressure drop, Reynolds, friction factor, pump power 118 Projectile Motion Calculator Calculate trajectory, range, height, and flight time with animation. 246 Resistor Color Code Calculator Decode color bands to resistance values or encode values to colors. 177 Scientific Calculator Trig, algebra, primes, and base conversion in one powerful tool 180 Statistical Power Calculator Required sample size for t-tests, proportions, ANOVA, and chi-squared at any power and alpha 110 Statistics Calculator Descriptive stats, distributions, hypothesis testing, and regression 242 Tide & Fishing Window Planner NOAA tide predictions plus solunar windows and dawn/dusk overlays 3 Tree Age Estimator Estimate tree age from trunk diameter using ISA growth factors 728 Triangle Calculator Solve any triangle -- with BOTH solutions shown in the ambiguous case. 2 Unit-Aware Equation Solver Type an equation with units, get dimensional consistency and any-variable solution 106

Auto Loan Calculator Calculate monthly payments, total interest, and underwater risk 190 Car Depreciation Calculator See how your car loses value year by year with a 10-year projection 238 EV vs Gas Cost Calculator Real state energy prices, tax credits, and 5-year ownership cost 182 Fuel Cost Calculator Calculate your trip fuel cost and compare vehicles side by side 226 Lease vs Buy vs Finance Comparator The honest three-way -- money factor translated, equity counted, mileage priced. 2 MPG Calculator Calculate fuel economy and trip costs 211 Road Trip Fuel & Charging Cost Planner The real route, every mile priced in the state it is driven in -- today's gas or electricity rate, your car's EPA figure. New 1 Tire Size Comparator Will it fit -- and what will your speedometer be wrong by? 3 True Cost of Ownership Calculator What a specific car actually costs over five years, not what it costs to buy. 1 Vehicle Safety & Complaint Report The crash-test stars, and then the part nobody shows you: what owners complained about. 4 VIN Decoder & Recall Watch Factory build sheet, open safety recalls, complaints, and crash ratings from one VIN 3

Breach Directory & Exposure Timeline Every known breach, what it leaked, and how long it stayed hidden. 11 Credit Freeze & Post-Breach Action Plan What to actually do in the 48 hours after your data leaks, in the order that matters. 4 Data Broker Opt-Out Action Plan Get off the people-search sites -- real links, honest flags, progress saved. 3 Digital Estate & Legacy Planner What happens to your accounts when you die -- and the settings that only work if you flip them now. New 2 Email Header Analyzer Paste the raw headers of a suspicious message and read the forensics in plain English. 3 Password Generator Generate cryptographically secure passwords with strength analysis 158 Password Strength & Crack-Time Estimator Real entropy, the patterns a cracker exploits, and how long it survives bcrypt vs MD5. 4 QR Code Safety Scanner Decode any QR code before your phone trusts it -- image never uploaded. 7 Router Security Scorecard The real vulnerabilities published against your actual router model, ranked by what a stranger can reach. 3 Scam & Phishing Link Analyzer Paste a suspicious link and see what it really is, without clicking it. 4 Two-Factor Auth Coverage Planner Which of your accounts can actually be protected, ranked by what a phishing page cannot defeat. 3 Website Privacy X-Ray See every company a website reports you to, before you consent to anything. 5

Baby Name Finder Search 117,000 real names by rarity, trend, era and letter -- every rank, peak and trend from the SSA's own counts. New 3 Birthday Twins Real people born on your exact date, every one with an article you can go and check. 3 Can You Fake Randomness? Tap 120 random coin flips, then let real statistics catch you out. 4 Coin Flip Genuinely fair, and then it tells you whether your streak is actually strange. 3 Dice Roller Real dice notation, per-die results, and faces that are provably fair. 4 How Far You've Travelled Through Space Since you were born you have never left your chair -- and moved billions of miles. Every layer from a real velocity. New 3 Reaction Time & Focus Test A real continuous performance task, not a green-box reflex test. 7 The Birthday Paradox Room Enter a group's real birthdays: the exact odds two of them share a day, and which pairs actually do. New 2 The Day You Were Born The real weather, moon phase and prices on the day you arrived. 10 True Zodiac Your star sign is a 2,000-year-old calendar. This is where the Sun actually was. 9 Typing Speed Test A one-minute test with honest numbers -- net WPM, real accuracy, real consistency. 5 What Things Cost the Year You Were Born Gas, eggs, stamps, houses, the minimum wage -- then vs now, every number a real series. 4 Your Name Through Time How many babies got your name the year you were born, when it peaked, and where it ranks now -- real SSA counts, 1880 to today. New 7 Your Personal Climate Stripes One coloured bar for every year of your life, in your own town. 7