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Calculators for Weight, Nutrition & Fitness

Fast, private calculators built on published science. Work out your BMI, daily calories, macros and protein needs — with the formula, the assumptions and the limits shown for every result.

Popular: BMI Calculator TDEE Calculator Daily Calorie Calculator BMR Calculator

Popular Calculators

Each calculator shows its result instantly, explains what it means and lists the formula and sources behind it.

Body & Weight

BMI Calculator

Body mass index from your weight and height, with the adult WHO category.

Calories & Metabolism

TDEE Calculator

Estimate the calories you burn in a day, including activity: your maintenance calories.

Calories & Metabolism

Daily Calorie Calculator

A daily calorie target to maintain, lose or gain weight, with built-in safety limits.

Calories & Metabolism

BMR Calculator

Calories your body uses at complete rest, estimated with the Mifflin-St Jeor equation.

Nutrition & Macros

Macro Calculator

Split a daily calorie target into grams of protein, carbohydrate and fat.

Nutrition & Macros

Protein Calculator

Estimate how many grams of protein to eat each day, and per meal.

Weight Loss

Calorie Deficit Calculator

The gap between your maintenance calories and your intake target, per day and per week.

Browse by category

15 calculators across six areas. New tools are added as soon as their formulas are tested and documented.

Body & Weight

1 of 3 calculators available

Where your weight and waist stand against reference ranges.

Waist-to-Height Ratio Calculator

Coming soon

Healthy Weight Calculator

Coming soon

Calories & Metabolism

3 of 3 calculators available

How much energy your body uses, at rest and in a full day.

Nutrition & Macros

2 of 2 calculators available

Turn a calorie target into protein, carbohydrate and fat.

Weight Loss

1 of 2 calculators available

Plan a realistic energy deficit and timeline, with safety limits.

Weight Loss Calculator

Coming soon

Body Composition

0 of 3 calculators available

Estimate body fat, lean mass and fat distribution.

Body Fat Calculator

Coming soon

Lean Body Mass Calculator

Coming soon

Waist-to-Hip Ratio Calculator

Coming soon

Trackers & Meal Planning

0 of 2 calculators available

Log your progress and plan meals with a shopping list.

Weight & Measurements Tracker

Coming soon

Meal Plan Generator & Shopping List

Coming soon

Track your progress, plan your meals

Beyond one-off results: tools to follow your measurements over time and turn your targets into a weekly plan.

Coming soon

Weight & Measurements Tracker

Log weight and measurements privately in your browser and chart progress.

  • Log weight, waist, hips and other measurements by date
  • Progress chart and comparison between two dates
  • Stored privately in your browser — no account needed
  • Export to CSV at any time
Coming soon

Meal Plan Generator & Shopping List

Build a meal plan and a combined shopping list from your targets.

  • Menus built from a structured recipe database
  • Portions scaled to the number of people
  • Combined shopping list with tick boxes, print and export
  • Nutrition values shown with their source — never invented

Results you can check

Documented formulas

Every calculator names its equation, shows the calculation and links to the WHO guidance or peer-reviewed study it comes from.

Built-in safety limits

Calorie targets never go below recognised minimums, and results that need medical follow-up say so clearly.

Private by design

Calculations run in your browser. Your weight and measurements are not sent to our server or to analytics.

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