Active Outdoor & Team Sports

Calculate adult BMI from metric or imperial height and weight. See CDC screening categories, formula steps, and limitations without treating BMI as a diagnosis.

Convert a user-selected energy total and carbohydrate, protein, and fat percentages into calories and grams with adult AMDR context.

Compare adult BMR equations and a selected activity-multiplier TDEE scenario without generating calorie, macro, or meal prescriptions.

Reproduce mean kilometre/mile pace and speed from one completed source-owned race result and retained event distance, with an optional same-result displayed-pace comparison—without creating targets, splits, predictions or training advice.

Calculate a user-entered heart-rate-reserve percentage range with the Tanaka age-estimated maximum. Shows formula and limits; never prescribes training zones.

Compare adult beverage water with National Academies total-water Adequate Intake references while keeping food water and individual needs explicit.

Calculate average pace per kilometer and mile plus speed from one entered distance and elapsed time. Transparent constant-pace arithmetic, not a race predictor.

Reconcile one completed conventional bicycle gear-pair record from whole tooth counts, measured loaded wheel rollout, and installed crank length.

Reconcile one completed bicycle cadence-speed interval from whole-tooth gearing, measured loaded rollout, recorded speed, and observed distance/time.

Reconcile one completed session-RPE load with its protocol, duration, global rating, source context, and independent same-record result.

Estimate adult body-fat percentage with a sex-specific U.S. Navy circumference equation, explicit measurement guidance, unit conversion, and non-diagnostic limitations.

Calculate your running pace per mile or kilometer from race time and distance. Free running pace calculator for marathon training, race planning.

Estimate weekly training load (arbitrary units) from volume and intensity. Free running training load calculator for marathon training, race planning.

Predict finish time at a new distance based on a recent race result. Free running race predictor calculator for marathon training, race planning.

Calculate Karvonen heart rate training zones for running. Free running heart rate zones calculator for marathon training, race planning, and pace analysis.

Estimate Functional Threshold Power from a 20-minute test. Free cycling ftp estimate calculator for road cycling, bike fitment, and power training.

Estimate cycling power from speed, gradient, and rider weight (simplified model). Free cycling power (watts) calculator for road cycling, bike fitment.

Calculate Training Stress Score from ride duration, normalized power, and FTP. Free cycling tss calculator for road cycling, bike fitment, and power training.

Calculate Critical Swim Speed from 400 m and 200 m time trials. Free css (critical swim speed) calculator for pool training, triathlon prep, and swim workouts.

Estimate your one-rep max from submaximal weight and reps. Free one-rep max (1rm) calculator for weightlifting, powerlifting, and gym programming.

Calculate total training volume for a lift or session. Free training volume calculator for weightlifting, powerlifting, and gym programming.

Calculate swim pace per 100m or 100 yards from time and distance. Free swim pace calculator for pool training, triathlon prep, and swim workouts.

Calculate SWOLF efficiency score for a pool length. Free swolf score calculator for pool training, triathlon prep, and swim workouts.

Estimate VO₂max from a 12-minute Cooper test distance. Free running vo₂max estimate calculator for marathon training, race planning, and pace analysis.

Recommend target cadence (steps per minute) based on height and pace. Free running cadence optimizer calculator for marathon training, race planning.

Estimate running economy (oxygen cost) from VO₂max and race pace. Free running economy calculator for marathon training, race planning, and pace analysis.

Calculate additional power needed to climb a given gradient at speed. Free climb gradient effect calculator for road cycling, bike fitment, and power training.