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Health & Fitness Tools

Calculators for macronutrients, calories, body composition, hydration, and more. Get the numbers you need to make informed decisions about your health and fitness goals.

Understanding your body starts with understanding the numbers. Whether you are counting macros to hit a fitness goal, estimating your daily calorie needs, or trying to figure out the right protein intake for your body weight, accurate calculations make the difference between guessing and planning.

Our health and fitness tools take the complexity out of nutrition math. Enter a few details about yourself and your goals, and get personalized results instantly. No confusing spreadsheets, no conflicting advice from random forums — just clear numbers based on widely-used formulas.

These tools are informational and designed to support your wellness journey. For medical advice or specific dietary needs, always consult a healthcare professional.

Health & Fitness Tools

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BAC Calculator
Estimate your blood alcohol content based on drinks, weight, and time
Biological Age Calculator
Discover your body's real age based on your lifestyle
Blood Pressure Calculator
Understand your blood pressure reading with clinical context
BMI Calculator
Calculate your Body Mass Index and understand what it means
Body Fat Calculator
Estimate your body fat percentage using Navy, circumference, or skinfold methods
Caffeine Calculator
Calculate your safe daily caffeine limit and track intake
Calories Burned Calculator
Calories burned by activity & duration
Chocolate Toxicity Calculator for Dogs
Find out if the chocolate your dog ate is dangerous -- fast
Dog Food Calculator
Precise daily feeding portions based on your dog's needs
Dog Years Calculator
Convert your dog's age to human years using modern veterinary science
Due Date Calculator
Calculate your estimated due date and track key pregnancy milestones
Fasting Calculator
Plan your intermittent fasting schedule and see when your body enters each metabolic zone
Keto Calculator
Calculate your personalized keto macro targets for fat, protein, and carbs
Life Expectancy Calculator
See how your lifestyle choices impact your projected lifespan
Macro & Calorie Calculator
Find your daily calories and macros based on your body and goals
Nutrition Label Analyzer
Instant health grade and nutrition breakdown for any packaged food
One-Rep Max Calculator
Estimate your one-rep max and plan your training percentages
Pace & Race Time Calculator
Find your pace, finish time, or distance — with splits for every mile
Pregnancy Weight Gain Calculator
Track recommended weight gain week by week through pregnancy
Protein Per Dollar Calculator
Rank any food by protein grams per dollar with live USDA data
Recovery & Readiness Score
Get a 0-100 readiness score to know when to push and when to rest
Sleep Cycle Calculator
Find the best times to sleep and wake based on your sleep cycles
Steps to Distance Calculator
Convert your step count into miles, kilometers, and calories burned
Supplement Stack Analyzer
Check your supplement stack for interactions, overlaps, and optimal timing
TDEE Calculator
Find your daily calorie target based on your body and activity level
Training Plan Builder
Generate a progressive multi-week training plan for any goal
VO2 Max Calculator
Estimate your VO2 max and cardio fitness age with four test protocols
Water Intake Calculator
Personalized daily hydration guide

Who Are These Tools For?

Fitness Enthusiasts

Calculate macros, track calorie targets, and dial in your nutrition to match your training goals.

Health-Conscious Adults

Understand your BMI, daily calorie needs, and body composition for better long-term health decisions.

Coaches & Trainers

Generate quick nutrition estimates for clients without needing expensive software.

Frequently Asked Questions

Our calculators use widely accepted formulas like the Mifflin-St Jeor equation for BMR, standard macro split ratios, and NIH body composition guidelines. Each tool explains the formula it uses.

No. These tools provide estimates based on general formulas and are meant for informational purposes only. For medical advice, dietary restrictions, or specific health conditions, consult a qualified healthcare professional.

Most fitness professionals recommend recalculating every 4 to 6 weeks, or whenever your weight, activity level, or goals change significantly.

Yes. Every tool on EvvyTools is free with no signup required. Subscribers get bonus features like saved history and premium options, but the core tools are always free.