Fitness & Cardio Calculators & Trackers

Estimate activity calories from a selected MET, body weight and duration with the MET value and uncertainty visible.

Estimate running calories from weight, distance/duration and pace or speed assumptions.

Estimate cycling calories from body weight, duration and selected speed/intensity MET.

Estimate swimming calories from body weight, duration and selected stroke/intensity MET.

Estimate hiking calories from body weight, duration and hiking intensity, with optional sourced modifiers kept conservative.

Estimate resistance-training calories from body weight, duration and intensity while avoiding false precision.

Calculate running pace per kilometre and mile, speed and common-distance equivalents from distance and elapsed time.

Predict an equivalent race time with the Riegel equation and warn when extrapolation distances are far apart.

Build even, negative or positive split tables from race distance, finish time and split interval.

Estimate training-pace ranges from a recent race performance using a named preset methodology, not a medical prescription.

Estimate VO₂ max with a named field-test method such as Cooper 12-minute or 1.5-mile and show the method-specific assumptions.

Compare age-predicted maximum heart-rate equations and explain individual variability.

Calculate a target heart-rate range using percent of max HR or heart-rate reserve/Karvonen mode.

Build a five-zone heart-rate table using percent of max HR or heart-rate reserve.

Estimate a Zone 2 heart-rate range and explain why different methods can produce different ranges.

Estimate one-repetition maximum from lifted weight and reps using Epley, Brzycki and other established formulas.