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Sports & Performance tool map

Running & endurance

Pace, distance, race, and endurance estimates.

Choose the tool whose inputs and output match your task. Check each calculator’s assumptions and limitations before using its result.

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Running and endurance tools cover the pace, time, and distance relationships behind training runs and race day. Start with the running pace calculator, which solves for any one of pace, elapsed time, or distance from the other two. The half marathon pace calculator turns a target finish time into per-kilometer splits and cumulative checkpoints, while the pace converter calculator translates minutes per mile into minutes per kilometer, miles per hour, or treadmill speed. If you walk or run a measured course, the stride length calculator estimates step length from distance and counted steps; swimmers can use the swimming speed calculator for per-100-meter pace. See the full set in the Sports & Performance collection.

5 of 5 calculators

Frequently asked questions

What distance does the half marathon pace calculator use?
It uses the standard half-marathon distance of 21.0975 km, which is 13.1094 miles. Pace and cumulative splits are computed from that fixed distance and the finish time you enter.
Why do split displays sometimes differ from hand-math?
Calculations retain raw seconds throughout and round only when a split is displayed, to the nearest second. Intermediate values are not rounded, so small final-place differences come from display rounding rather than a different method.
Does even pacing predict my actual race splits?
No. Even pacing is an arithmetic plan, not a prediction or coaching prescription. Course measurement, terrain, weather, stops, and individual capacity can all make actual splits differ from the calculated values.

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Bicycle Gear vs Running Pace CalculatorCompare cycling speed derived from gearing, cadence, and a measured wheel against running pace, time, and distance in miles or kilometers.Bicycle Gear vs Swimming SpeedCompare two speed calculators from different sports: theoretical cycling speed from chainring and cog teeth, cadence, and measured wheel rollout versus average swimming speed, pace per 100 meters, and projected times.Bicycle Power vs Half Marathon PaceCompare two endurance-effort measurements: cycling mechanical power computed from motion and resistance inputs versus half marathon pace from a target finish time, one in watts and the other in time per distance.Bicycle Power vs Running PaceCompare the two canonical endurance-effort metrics: cycling mechanical power in watts from motion and resistance inputs versus running pace, time, and distance in miles or kilometers.Half Marathon Pace vs Pace ConverterCompare planning a half marathon with race-specific even splits for the 21.0975 km distance versus converting a known pace between min/km, min/mile, km/h, and mph.Half Marathon Pace vs Running Pace CalculatorCompare race-specific half marathon pacing with even mile and kilometer splits against a general pace, time, and distance calculator.Half Marathon Pace vs Stride LengthCompare a race-pacing tool — even half-marathon splits from a target finish time over 21.0975 km — with a measured gait tool — step length from a measured distance and counted-step trials.Half Marathon Pace vs Swimming SpeedCompare two sport-specific pace calculators: even half-marathon splits from a target finish time versus swimming speed, pace per 100 meters, and projected times from a measured swim.Half Marathon Pace vs Vertical SpeedCompare two pace-planning calculators: even mile and kilometer splits for the standard 21.0975 km half marathon versus neutral ascent or descent rates from signed vertical distance and elapsed time.Pace Converter vs Speed ConverterCompare pace converter and speed converter: one swaps between min/km, min/mile, km/h, and mph as reciprocals, the other converts km/h, mph, m/s, and knots through a four-unit speed hub.Pace Converter vs Stride LengthCompare two running-measurement tools: converting pace and speed between min/km, min/mile, km/h, and mph versus measuring step or stride length from a known distance and counted-step trials.Reaction Time vs Half Marathon Pace CalculatorCompare browser-observed response latency across repeated visual trials against half marathon pace and even splits from a target finish time.Reaction Time vs Running PaceCompare two measured-performance tools on the sprint-performance theme: browser-observed reaction latency across repeated trials versus running pace computed from time and distance, both narrow measurements with no performance verdict.Reaction Time vs Stride LengthCompare two measured-performance tools: browser-observed reaction latency across repeated trials versus step length estimated from a measured distance and counted-step trials.Reaction Time vs Swimming SpeedCompare two speed-related sports measurements: browser-observed reaction latency from repeated trials versus average swimming speed, pace per 100 meters, and projected times from distance and elapsed time.Running Pace Calculator vs Pace ConverterCompare solving pace, time, or distance from your run data against converting a known pace between min/km, min/mile, km/h, and mph.Running Pace Calculator vs Speed ConverterCompare the running pace calculator, which solves pace, time, or distance in miles or kilometers, with the speed converter, which translates km/h, mph, m/s, and knots.Running Pace vs Stride LengthCompare the running pace calculator, which solves pace, time, or distance in miles or kilometers, with the stride length calculator, which measures step length from a known distance and counted steps.Running Pace vs Vertical JumpCompare two sports-performance measurements: running pace computed from time and distance versus jump height from standing reach and three jump-reach trials, one an endurance planning metric and the other an explosive single-effort test.Stride Length vs Vertical SpeedCompare two movement-metrics calculators: step or stride length from a measured distance and counted-step trials versus neutral ascent or descent rates from signed vertical distance and elapsed time.Swimming Speed vs Pace ConverterCompare two endurance-pace tools: the swimming speed calculator reports speed, pace per 100 meters, pool lengths, and constant-pace projections, while the pace converter switches between min/km, min/mile, km/h, and mph.Swimming Speed vs Running Pace CalculatorCompare pool pace per 100 meters with equivalent lengths and projected times against running pace, time, and distance in miles or kilometers.Swimming Speed vs Stride LengthCompare two measured-locomotion calculators: swimming speed with pace per 100 meters from an entered distance and time versus step length from a measured distance and counted-step trials.Swimming Speed vs Vertical JumpCompare two measured-performance tools: average swimming speed, pace per 100 meters, and projected times from distance and elapsed time versus jump height from standing reach and three jump-reach trials.Swimming Speed vs Vertical Speed CalculatorCompare pool pace per 100 meters with equivalent lengths and projected times against neutral ascent or descent rates from signed vertical distance and elapsed time.Vertical Jump vs Half Marathon Pace CalculatorCompare explosive power measurement from standing reach and jump-reach trials against half marathon pace and even splits from a target finish time.Vertical Jump vs Stride LengthCompare two measured-performance tools: jump height from standing reach and three jump-reach trials versus step length from a measured distance and counted-step trials.Vertical Speed vs Running PaceCompare two on-foot movement-rate calculators: ascent and descent rates from signed vertical distance and elapsed time versus running pace, time, or distance solved from the other two quantities.

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