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All tools

Pace, charts, race planning, calories, track and triathlon. Free, no sign-up, nothing you type leaves your browser.

Pace calculators

Pace calculatorPace, time or distance from the other two Pace converterMin per mile, min per km, mph, km/h Split calculatorEven, negative or positive splits Race time predictorPredict any race from a recent one Half marathon predictorYour half marathon time from a 10K Marathon pace calculatorPace for any marathon goal time Mile pace calculatorMile time, per km, mph and laps Grade adjusted paceHill pace to its flat-ground equal Course pace planner (GPX)Even-effort splits for a hilly course Race distances5K, half, marathon in miles and km

Pace charts and bands

Running pace chartFinish times for every pace, all distances Marathon pace chartEvery mile and km split for any goal Half marathon pace chartSplits for any half marathon goal 10K pace chartMile and km splits for any 10K goal 5K pace chartMile and km splits for any 5K goal Pace band generatorPrintable wrist pace band, any goal Treadmill pace chartmph and km/h to pace, incline equivalent 400m track pace chartLap times for every mile pace

Training and racing

Training pace calculatorEasy, tempo and interval paces from a race Heart rate zones5 zones from age, max or resting HR VO2 max calculatorCooper test, 1.5-mile run or a race Cadence calculatorSteps per minute from a count or pace Stride length calculatorStep and stride length from pace or a count Steps to milesSteps to miles, and steps per mile Taper calculatorWeek-by-week mileage before a race Carb loading calculatorGrams of carbs a day before a race Race fueling calculatorCarbs per hour and gels for race day Sweat rate calculatorFluid lost per hour from a weigh-in Run walk timerRun/walk intervals with beeps and voice Running interval timerTimer for track repeats, fartlek and hill reps Age grading calculatorAge grade % for any road race Rockport walk testVO2 max from a fast 1-mile walk Harvard step testFitness index from a 5-minute step test Bruce protocol calculatorVO2 max from Bruce treadmill time

Calorie calculators

Calories burned calculatorAny activity, from yoga to running Running calorie calculatorCalories per run, per mile and per hour Walking calorie calculatorCalories for any walk, flat or uphill Treadmill calorie calculatorCalories from belt speed and incline Hiking calorie calculatorTrail calories by activity or by slope Cycling calorie calculatorBike calories from speed or power Stationary bike caloriesExercise bike calories from watts Rowing calorie calculatorRowing machine calories from split Swimming calorie calculatorCalories by stroke and effort

Track, triathlon and bike

Track split calculator400 m laps and lane distances Triathlon calculatorSwim, bike, run and transitions Swim pace calculatorPace per 100 m and per 100 yd

About these tools

Every tool here runs in your browser with no account: type a time, distance, pace or weight and the result appears straight away, with the formula behind it one tap away. Pace maths uses the official race distances (a marathon is 42.195 km, a mile exactly 1,609.344 m), predictions use Riegel's formula and the Daniels and Gilbert oxygen-cost equations, calories use the ACSM metabolic equations and the 2024 Compendium of Physical Activities, and age grading uses Alan Jones's 2025 road tables. Settings such as miles or kilometres are remembered on your device only, and any result can be shared with a link that carries the numbers. New here? Start with the pace calculator or the marathon pace chart.