Cycling Pace / Time Calculator

Time = distance / speed. Convert any of {distance, speed, time} given the other two.

Inputs

Result

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General calculation reads

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How to use this calculator

  • Pick what you want to solve for.
  • Fill in the other two values.
  • Mix km/h and miles freely — units convert internally.

About this calculator

A 100 km ride at 25 km/h takes 4 hours. At 30 km/h, 3:20. At 35 km/h, 2:51. Cyclists rarely hold their FTP-equivalent speed for long rides — wind, climbs, and fatigue cost 10-20%. Use this calculator to plan: enter expected average speed (lower than your training rides!) for time goals, or back-solve average speed needed to hit a finish time on a known route.

Frequently asked

Why is my predicted time longer than my Strava avg?+
Strava average includes all stop time; moving average is lower. For ride planning, use moving average and add 5-15 min for stops.
How does wind affect this?+
A 20 km/h headwind costs ~25% of effort. Tailwind helps less than the headwind hurts (drag is squared).
Climbing time?+
On any climb steeper than 4%, your speed drops dramatically — use a per-segment calculation, not a flat-average estimate.
Difference from running pace calculators?+
Same math, different units. Cyclists think in speed (km/h, mph); runners think in pace (min/km, min/mi).
How do pros plan stage time?+
They use power-based prediction with course profile, not just avg speed. Apps like BestBikeSplit or PerfPro do this.

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Cycling Calorie Burn by Power Calculator
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Gradient (Grade %) Calculator
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Calculate pace per mile and per kilometer from any distance and finish time, with 5K/10K/half/marathon split projections.
Finish Time from Pace Calculator
Predict your race finish time given a target pace and distance.

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