Know your numbers.
Fast, transparent fitness & health calculators — backed by real formulas, not guesses.
Every calculator shows its formula and a worked example you can verify.
Formulas cite NIH, WHO, ACOG, ACSM and peer-reviewed sources, with review dates.
Long-form articles that explain the numbers — not dense ad-cluttered utility pages.
Popular calculators
View all →BMI Calculator
Calculate your Body Mass Index and see where you fall on the WHO weight categories.
Open calculatorCalorie Calculator
Find your daily calorie target for maintenance, loss, or gain.
Open calculatorBody Fat Calculator
Estimate your body fat percentage with the U.S. Navy tape-measurement method.
Open calculatorDue Date Calculator
Estimate your pregnancy due date from LMP, conception, ultrasound, or IVF transfer.
Open calculatorMacro Calculator
Split your daily calories into protein, carbs, and fat — across five plans, or build your own.
Open calculatorTDEE Calculator
Find your Total Daily Energy Expenditure and compare cut, maintain, and bulk targets.
Open calculatorBrowse by category
Body Composition & Weight
BMI, body fat, ideal weight, lean body mass, waist-to-hip ratio, and healthy weight — measures of what your body is made of.
7 calculatorsEnergy & Nutrition
Calorie, BMR, TDEE, macro, protein, and water intake calculators — how much fuel and hydration your body needs.
8 calculatorsPerformance & Training
One-rep max, target heart rate, pace, and calories burned — numbers that guide how you train and move.
4 calculatorsPregnancy & Cycle
Due date, conception, ovulation, and pregnancy weight gain calculators — timeline tools for fertility and pregnancy.
8 calculatorsClinical & Lifestyle
Kidney function, body surface area, and blood alcohol — measures that come from a lab report or a clinical setting rather than a gym.
3 calculatorsFrom the blog
All articles →BMI vs. Body Fat Percentage: Which Actually Matters?
BMI is everywhere, but it can't tell muscle from fat. Here's what each measure captures, where each one misleads, and how to read them together.
Read articleWhat Is a Healthy BMI? Understanding the WHO Categories
Where the 18.5–24.9 range came from, what the categories above and below it actually mean, and how much weight to put on the number.
Read articleHow to Measure Body Fat at Home (Without Calipers)
A practical guide to the U.S. Navy tape method — where to place the tape, how to avoid the common errors, and how it compares to scales and scans.
Read articleWaist-to-Hip Ratio vs. BMI: Which Predicts Health Risk Better?
Where you store fat matters as much as how much you carry. What waist-to-hip ratio measures, what the WHO thresholds mean, and when it beats BMI.
Read articleWhy the Scale Isn't Telling You the Whole Story
Muscle and fat weigh the same but occupy different space. What that means for tracking progress, and why the scale can stall while your body changes.
Read articleIdeal Weight Formulas Compared: Devine, Robinson, Miller and Hamwi
Four formulas, four different answers, all from the same height. Where they came from, why they disagree, and what to use instead of any of them.
Read articlePrinted from mystatura.com — for general information only, not medical advice.