MOST USED
BMI Calculator
Body Mass Index from your height and weight, plotted against the healthy range instead of dumped on you as a bare number. Metric and imperial in one tap.
- FORMULA
- Standard BMI · WHO weight categories
Calculate your BMI.
Most calculators hand you a number and hide the maths behind it. Ours name the equation on every card — Mifflin‑St Jeor, the US Navy method, Devine and Robinson — so you can check the result, argue with it, or take it to your doctor.
Six of the seven, below. Every one runs in your browser, returns a result in a second or two, and forgets your numbers the moment you close the tab.
MOST USED
Body Mass Index from your height and weight, plotted against the healthy range instead of dumped on you as a bare number. Metric and imperial in one tap.
CALORIES
What you actually burn in a day, sitting still and moving. Set your activity level once and read maintenance, cutting and bulking targets off the same screen.
NUTRITION
Protein, carbs and fat in grams per day, split for your goal. Grams, not percentages you have to convert again while standing in the supermarket.
COMPOSITION
The US Navy circumference method: neck, waist, hips, height. A tape measure is the only equipment needed, and it reads your composition far better than BMI can.
MORE PRECISE THAN BMI
Four clinical equations run side by side — Devine, Robinson, Miller and Hamwi — with frame size factored in. You get a range, because a healthy weight is a range.
SLEEP
Bedtimes and wake times built on 90-minute cycles, plus the quarter hour it takes most people to drop off. The point is to wake between cycles, not through one.
Three things we do differently from the calculator sites already ranking above us.
No sign-up, no paywall on the seventh use. Open the tool, take the number, close the tab. That is the whole product.
Every calculator states which published equation produced your result. Most sites say “science-based” and leave it there. You can check ours.
Your height, weight and measurements are calculated in the browser. Nothing reaches a server, so there is nothing for us to store, sell or lose.