Running & endurance
Pace, split times, race predictions and training zones, in kilometres or miles. 38 tools, including Backpacking Food Weight Calculator, Bike Gear Ratio Calculator, Boxing punch power calculator and Calories burned calculator. All free, with no account and nothing to install.
Backpacking Food Weight CalculatorEstimate how much your trail food will weigh from trip length, calories and food calorie density, with a safety buffer.Bike Gear Ratio CalculatorChainring and cog teeth to gear ratio, gear inches, metres of development, Sheldon Brown gain ratio and speed at your cadence, with a full gear chart.Boxing punch power calculatorImpact force is the effective striking mass times the change in speed over the contact time (F = m·v/t); the punch also carries momentum m·v and kinetic energy ½·m·v². Enter the mass behind the fist, the fist speed and the contact time.Calories burned calculatorEstimate calories burned during an activity (MET method).Climbing Grade ConverterConvert climbing grades between YDS, French, UIAA, British trad, Ewbank and Saxon for roped routes, and between the V-scale and Fontainebleau for bouldering.Cooper 12-Minute Run CalculatorEstimate VO₂max and your fitness category from the Cooper 12-minute run test, from the distance you covered, your age and sex.Cycling power calculatorEstimate the power (watts) needed to ride at a speed on the flat.Cycling speed calculatorTurn a distance and a ride time into your average speed — in km/h and mph — and the pace per kilometre. Handy for pacing a sportive or checking a training ride.Cycling Power Zones CalculatorGet your Coggan cycling power zones (Z1–Z5) from your FTP.FTP calculator (cycling)Estimate your cycling Functional Threshold Power from a 20-minute test.Gym vs Home Workout Cost CalculatorTotal cost of a gym membership vs a home setup over years, break-even month and cost per workout.Heart rate zones calculatorFind your five training heart rate zones from your age.Hiking Time Calculator (Naismith)Estimate hiking time from distance and elevation using Naismith's rule with a Langmuir descent correction.MET calories calculatorEstimate calories burned for an activity using its MET value.Pace CalculatorCompute your running pace (min/km) and average speed from distance and time.Pace ConverterConvert between min/km, min/mile, km/h and mph.Pace to Calories CalculatorTurn your running, walking, hiking or treadmill pace into calories burned using the ACSM metabolic equations, with incline support.Pace to finish time calculatorTurn your running pace and a race distance into an expected finish time.Pace Zone CalculatorTurn your threshold pace into five training zones — recovery, easy, threshold, interval and repetition.Power-to-weight ratio calculatorCompute your cycling power-to-weight ratio in watts per kilogram.Race time predictorPredict your finish time over a new distance from a recent race result (Riegel formula).Running calories calculatorEstimate the calories burned running a distance for your weight.Running Volume Calculator (10% Rule)Plan safe weekly mileage increases using the 10% rule.Sprint speed calculatorCompute your speed in m/s, km/h and mph from a sprint distance and time.Steps to calories calculatorEstimate calories burned and distance walked from a number of steps.Steps to distance calculatorConvert your daily steps into distance and calories from your height.Sweat rate calculatorEstimate your hourly sweat rate to plan hydration during exercise.Swimming Calories CalculatorEstimate calories burned while swimming using MET values.Swimming pace calculatorCompute your swimming pace per 100 m and speed from a distance and time.Swimming SWOLF calculatorSWOLF — “swim golf” — scores your stroke efficiency: add the strokes you take for one pool length to the seconds it takes. A lower score means you are covering the distance with less effort. It shows your SWOLF, a 25 m–normalised score to compare pools, and a rating.Target heart rate calculatorFind your target training heart rate with the Karvonen formula.Target race pace calculatorWork out the pace and speed needed to finish a race in a target time.Tent Footprint Size CalculatorWork out the finished and cut size of a DIY tent footprint, tucked slightly under the tent edges.Triathlon Pace CalculatorSwim, bike and run splits with per-segment pace and total time, with preset race distances.VMA calculatorEstimate your maximal aerobic speed from a 12-minute (Cooper) test.VO₂ max calculatorEstimate your VO₂ max from a 12-minute (Cooper) run test.Walking time calculatorEstimate how long it takes to walk a distance at a given speed.Yoga pose hold timerPlan a yoga flow and know exactly how long it will take. Load a ready-made sequence — sun salutation, morning energiser, bedtime relax, balance and core — or build your own from a library of twenty poses, set each hold, reorder them, add a get-ready countdown, transitions and rounds. It totals the session time and, with your weight, estimates the calories.