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Fitness and Health Calculators – Free Online Tools

All fitness and health calculators, from BMI and calories to pregnancy and heart rate, in one place.

Browse the Health & Fitness collection

33 free tools — each with live calculation, explanation, FAQs and an embed code.

BMI Calculator

Calculate your Body Mass Index from height and weight and see which category you are in.

Body Fat Calculator

Estimate body fat percentage with the U.S. Navy circumference method.

Macro Calculator

Find your daily calories and protein, fat and carb targets by goal and activity.

Pregnancy Calculator

Calculate how far along you are, when the baby is due and which trimester you are in.

Pregnancy Conception Calculator

Estimate when conception likely happened from your due date.

Conception Calculator

Predict your fertile window and ovulation from your cycle.

Pace Calculator

Convert running or cycling distance and time into pace and speed.

Carbohydrate Calculator

Estimate how many grams of carbohydrates you need each day.

Healthy Weight Calculator

Find a healthy weight range for your height using BMI and common formulas.

One Rep Max Calculator

Estimate your one-repetition maximum from a heavy set and get training percentages.

Protein Calculator

Estimate your daily protein needs by body weight and goal.

TDEE Calculator

Calculate total daily energy expenditure and calorie targets for losing, maintaining or gaining.

GFR Calculator

Estimate your glomerular filtration rate (kidney function) from a blood creatinine test.

Futurism BMI Calculator

A BMI calculator in the style of the popular Futurism tool, with level classification.

Calorie Calculator

Estimate your daily calorie needs for losing, maintaining or gaining weight.

Body Surface Area Calculator

Compute your body surface area with the Mosteller formula.

Anorexic BMI Calculator

Check a BMI score against the eating-disorder risk threshold.

Overweight Calculator

See whether your BMI places you in the overweight or obese categories.

BMR Calculator

Calculate your basal metabolic rate with Mifflin-St Jeor and Harris-Benedict.

Ideal Weight Calculator

Estimate your ideal body weight with several classic formulas.

Pregnancy Weight Gain Calculator

See recommended weight gain ranges for pregnancy based on your starting BMI.

Due Date Calculator

Estimate your baby\u2019s due date and key pregnancy landmarks.

Army Body Fat Calculator

Estimate body fat percentage with the US Army tape-measure method.

Lean Body Mass Calculator

Split your weight into lean mass and fat mass.

Calories Burned Calculator

Estimate calories burned during exercise by activity, weight and duration.

Target Heart Rate Calculator

Find your target heart rate zones with the Karvonen formula.

Fat Intake Calculator

Estimate a daily fat target in grams for your calorie goal.

Ovulation Calculator

Predict your ovulation day and fertile window for planning.

Period Calculator

Predict your next periods using cycle length.

Body Type Calculator

Estimate whether you lean toward ectomorph, mesomorph or endomorph from measurements.

BAC Calculator

Estimate your blood alcohol concentration with the Widmark formula.

Weight Watchers Points Calculator

Estimate the points value of a food item with the PointsPlus-style formula.
About the Fitness and Health Calculator

What is the Fitness and Health Calculator?

The fitness and health calculator hub gathers every health tool on this site: body measurements, calorie needs, pregnancy dates, heart rate zones and more.

Why use this page?

Whether your goal is losing weight, planning a workout, or tracking a pregnancy, having one reliable place for the numbers removes guesswork and keeps you consistent.

How to use it

  1. Pick a calculator from the grid below.
  2. Enter your measurements and details.
  3. Read your result and the explanation behind it.
  4. Use the embed code on any calculator to add it to your own website.
Health results are estimates, not medical advice. Always talk to a health professional about your individual situation.
Frequently Asked Questions
Which calculator should I start with?
Most people start with the BMI calculator, the calorie calculator, or the TDEE calculator to get a baseline of their current numbers.
Are these results medically accurate?
They use widely published formulas, but every body is different. Use them as guidance and confirm important decisions with a professional.
Can I embed tools on my own site?
Yes. Every calculator page has an embed box in the sidebar with a ready-to-paste iframe snippet.
Is this a medical diagnosis?
No. This tool provides general wellness information only. It is not a substitute for evaluation by a qualified healthcare professional.
Why do results differ from my doctor's measurements?
Clinical measurements use calibrated equipment and professional technique. Home estimates rely on formulas and self-reported values, so small differences are normal.
How often should I recalculate?
Recheck after meaningful changes such as weight gain or loss, a new workout routine, or every few months to track trends over time.
Do these formulas apply to everyone?
Most population formulas are less accurate for athletes, pregnant people, very young children and the elderly. Use them as a general guide.
Is this calculator free to use?
Yes. Every calculator on this site is completely free, with no hidden fees, no subscriptions and no limits on how many times you can use it.
How accurate are the results?
We use standard, widely accepted formulas and calculate in your browser using double-precision arithmetic. Results are rounded for readability, so treat them as reliable estimates rather than a guarantee. Real-world factors can vary the true figure.
Can I add this calculator to my own website?
Yes. Open this calculator page and use the "Add to your website" box in the sidebar to copy a ready-made iframe snippet, then paste it into any HTML page.

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