FREE TOOLS · BY TOPIC

Health and fitness calculators

Compare measurements and routines with calculators that explain their assumptions.

Keep units consistent

Switch between metric and imperial units where a tool offers that choice. Check the label next to every entry before comparing two results.

Treat estimates as estimates

BMI is an adult screening measurement; heart rate zones and calorie needs are estimates based on inputs and general formulas. Individual circumstances can change what a number means.

Track a repeatable baseline

Use the pace or workout-volume tools with the same measurement approach each time. Comparing your own consistent entries is usually more informative than comparing unlike activities.

Open a tool

BMI calculatorEstimate adult body mass index.Adult BMI weight rangeConvert the adult healthy BMI category into a weight range.Waist-to-height ratioCalculate a measurement ratio without a diagnosis.Calorie calculatorEstimate daily energy needs for adults.Running pace calculatorConvert distance and duration into pace and speed.Heart rate zonesSee illustrative percentages of an estimated maximum heart rate.Sleep cycle plannerExplore approximate sleep and wake times.One rep max estimatorEstimate a one-repetition weight from a lighter set.Workout volume calculatorMultiply sets, repetitions, and weight lifted.Water intake trackerTrack drinks against a goal you choose.

Before you start

Can these tools diagnose a condition?

No. These are general calculators and trackers, not diagnoses or personalized medical advice.

Can I switch between kilograms and pounds?

The tools that accept body weight offer unit choices; check the labels and available unit controls on each tool.

See all 137 tools by category ↗