Free online health and lifestyle tools

Estimates basal metabolic rate, the calories the body burns at rest.

Calculates basal metabolic rate and daily calories by activity level.

Applies the US Navy tape-measure formula to waist, neck, hip and height to give a body fat percentage.

Calculates dough hydration and ingredient weights using baker's percentages.

Portuguese body mass index calculator.

Calorie, BMI, macro, water intake and RDA calculators plus a food database, with no signup.

Fitness site with 16+ free calculators such as BMI, TDEE and macros alongside shoe and watch guides.

Estimates one-rep max from weight and reps with common strength formulas.

Open source family meal planner that builds grocery lists by store section, plus an AI eBay listing helper.

Turns your age into target heart rate bands for fat burning, cardio and peak effort.

Calculates training heart rate zones from age and maximum heart rate.

Click numbered squares in order after they disappear, a working-memory test based on chimp research.

Memorize a growing string of digits and type it back to find how many you can hold.

Measure your reaction speed by clicking when the screen turns green and compare to global averages.

Repeat an increasingly long pattern of highlighted squares as far as you can.

Judge whether each word shown has appeared before, ending after three mistakes.

Compares seven published ideal-weight formulas for a given height.

Calculates nutrition facts for a recipe from its ingredients using the USDA database.

Counts down the time left based on your age and an assumed life expectancy.

Sets daily calorie and protein, carb and fat targets for cutting, bulking or maintaining.

Predicts equivalent race times and training paces from a recent result.

A dozen-plus health formulas in one place, including BMI, due date, A1C, blood pressure, kidney GFR and sleep.

Estimates your one-rep max for bench, squat and deadlift from weight and reps, with RPE options.

Predicts the most you could lift for one rep on any lift from a heavier multi-rep set.