Cycling Pace / Time Calculator
Time = distance / speed. Convert any of {distance, speed, time} given the other two.
Result
Loading calculator…
—
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.
Related calculators
Cycling Power-to-Weight Calculator
W/kg = sustained power (W) / body weight (kg). Maps to USAC category and Coggan rider type.
FTP from 20-Minute Test Calculator
Functional Threshold Power = 20-min average power × 0.95. The standard cycling test protocol.
Cycling Calorie Burn by Power Calculator
kcal ≈ avg watts × hours × 3.6 — direct from work done (kJ ≈ kcal at 25% gross efficiency).
Gradient (Grade %) Calculator
Grade % = rise / run × 100. Convert to angle (degrees) and category (Cat 4-HC).
Running Pace & Splits Calculator
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.