🏃 Built for UK gym-goers & runners

Train smarter,
not just harder

Free fitness calculators for running, strength training, cardio and recovery — all in one place, no sign-up needed.

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Free Tools

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Browser-Based

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Data Stored

Running Pace Calculator

Calculate pace, speed or finish time for any race distance — 5K, 10K, half marathon or full marathon.

VO2 Max Estimator

Estimate your VO2 max from a 1.5-mile run time or resting heart rate. Understand your aerobic fitness level.

Race Time Predictor

Predict your finish time for a new distance based on a recent race result.

Heart Rate Zone Calculator

Find your 5 personalised training zones for fat burn, aerobic base and peak performance.

One Rep Max Calculator

Estimate your 1RM and get a full training percentage table for any lift.

Wilks Score Calculator

Compare your powerlifting total across different bodyweights using the Wilks coefficient.

Calorie Burn Calculator

Calculate calories burned for over 20 exercises using your weight and duration.

Fitness BMI Calculator

BMI with athletic context — understand why BMI is limited for active people and what to use instead.

Athlete Protein Calculator

Daily protein target for your sport, training volume and goal — muscle gain, endurance or fat loss.

Athlete TDEE Calculator

Total Daily Energy Expenditure with sport-specific activity multipliers for accurate calorie targets.

Sports Hydration Calculator

How much to drink before, during and after exercise based on your sweat rate and session length.

Body Fat % Calculator

Estimate body fat % using the Navy Method with athlete-specific category context.

Steps to Calories

Convert your daily step count to calories burned based on your weight, height and pace.

Recovery Time Calculator

How long does your body need to recover after different types of training? Find out here.

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