Health calculators that make sense.
Free BMI, calorie, ideal-weight and calorie-deficit calculators backed by the same formulas dietitians use — with a clear, jargon-free readout.
- 100%
- Free, no sign-up
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- Evidence-based tools
- Cited
- Peer-reviewed sources
Our calculators
Four tools that cover almost every daily question about weight, calories and body composition.
BMI Calculator
Body Mass Index with a colour-coded health range and your healthy weight band.
Calorie Calculator
Mifflin-St Jeor TDEE with a macro breakdown and goal adjustments.
BMR Calculator
Calories burned at rest via Mifflin, Harris-Benedict and Katch-McArdle.
Ideal Weight Calculator
Compare Devine, Robinson, Miller and Hamwi — plus your healthy BMI range.
Macro Calculator
Turn your calories into protein, carbs and fat — balanced, keto, or custom.
Protein Calculator
Daily protein grams by goal, plus per-meal portions and food sources.
Exercise Calories
45+ activities with MET values — calories burned by your weight and duration.
Calorie Deficit Calculator
Set a safe weekly rate, see a timeline and macro split for fat loss.
Meal Planner
Instant 1-day or 7-day meal plans that fit your calorie and diet targets.
Body Fat Calculator
U.S. Navy tape method — estimate body-fat percentage with just a tape measure.
Lean Body Mass
Boer, James and Hume formulas with an estimated fat-mass comparison.
Waist-to-Height Ratio
Keep your waist less than half your height — a strong metabolic-risk screen.
Water Intake
Daily ml target adjusted for your bodyweight, activity and climate.
One Rep Max
Estimate your 1RM from a submaximal set plus a full %-of-max table.
Weight Tracker
Log your weight, see the 7-day average and trend — stored privately in your browser.
Quick unit converters
Everyday conversions most people Google first.
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Built on formulas dietitians actually use
Every number on NutriMeasure comes from a peer-reviewed equation or an authoritative guideline — not a content farm.
- Mifflin-St Jeor for Basal Metabolic Rate, today's clinical gold standard.
- Harris-Benedict activity multipliers (1.2–1.9) for converting BMR into daily calorie needs.
- NHLBI BMI categories for weight-status classification.
- ~7,700 kcal / kg fat approximation for realistic loss timelines.
A quick example
A 32-year-old woman, 165 cm, 70 kg, moderately active:
Try any calculator to get the same readout for your numbers.
Three numbers, thirty seconds, a clearer picture.
Start with BMI. Calorie targets and ideal-weight breakdowns are one click away.
Frequently asked questions
Are the NutriMeasure calculators free?+
Yes — every calculator on NutriMeasure is free, requires no sign-up, and runs entirely in your browser. We don't store any numbers you enter.
Which formulas do you use?+
BMI uses the standard kg/m² formula. Calories use the Mifflin-St Jeor equation (1990) with the standard Harris-Benedict activity multipliers (1.2–1.9). Ideal weight compares Devine, Robinson, Miller and Hamwi. Deficits assume about 7,700 kcal per kilogram of body fat (Wishnofsky, 1958).
Can I switch between metric and imperial?+
Every calculator supports both. Toggle the unit switch and your entered values convert automatically.
Is my data private?+
Yes. All calculations run on your device. We never send your height, weight or age to a server.