Free tools

Free tools for runners

Calculators and references for pacing, racing, fuelling and training. Simple, fast, and free — no sign-up, no catch.

Pace

Pace CalculatorTurn any distance and finish time into your pace per kilometre and per mile.Pace ChartA reference table of paces and the 5K, 10K, half and full marathon times they produce.Finish Time CalculatorSet a goal pace and distance to see the finish time you are on track for.

Racing

Race Time PredictorPredict your time at a new distance from a recent race result, using the Riegel formula.Marathon Time PredictorPredict your marathon finish time from a recent 5K, 10K or half marathon.Marathon Heat CalculatorAdjust your goal marathon time for race-day heat and see the pace the weather really allows.

Converters

Miles ↔ Km ConverterConvert miles to kilometres and back, with the common race distances built in.

Fuelling

Gel & Fuel CalculatorWork out how many gels and how many grams of carbs to take on a long run or race.

Training

Heart Rate ZonesFind your five training zones from your age, or from your measured max and resting heart rate.Calories Burned RunningEstimate the calories you burn on a run from your distance, time and body weight.Training Start DateFind the date to start training, counting back from race day by your plan length.