07 free tools Fitness, made measurable

Know your
numbers.
Move better.

Precise, private calculators for nutrition and strength—built to turn body data into decisions you can use today.

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PLATES / MACROS / PERFORMANCEEST. 2026
01 / No account02 / Private browser history03 / Metric & imperial04 / Evidence-based formulas

Trust, built into the product

Known methods.
No mystery math.

Every result names its method, explains its inputs, and keeps its limits visible.

MSJ
Mifflin–St JeorDaily calorie estimates
01
USN
U.S. Navy methodBody-fat estimates
02
E+B
Epley + BrzyckiOne-rep max estimates
03
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No account requiredInputs stay in your browser
04

Fitness utility index

One clear answer.
No clutter.

Every calculator is free, instant, and designed to work beautifully on any screen.

01
Body

BMI Calculator

Estimate your body mass index and see the healthy weight range for your height.

↗02
Nutrition

Calorie Calculator

Estimate your daily energy needs using the Mifflin–St Jeor equation.

↗03
Nutrition

Macro Calculator

Turn a calorie target into practical protein, carbohydrate, and fat goals.

↗04
Body

Body Fat Calculator

Estimate body-fat percentage using the circumference-based U.S. Navy method.

↗05
Strength

One-Rep Max Calculator

Estimate the heaviest weight you can lift once from a recent working set.

↗06
Strength

Plate Calculator

See exactly which plates to load on each side of the bar.

↗07
Strength

Warm-Up Calculator

Build a progressive, fatigue-conscious ramp to your working weight.

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The principle

“Measure what matters.
Ignore what doesn’t.”
01

Transparent formulas and practical results—not false precision. Save useful defaults and keep every calculation on your device.