Free Pace Calculator
Running pace, time, or distance — solve for any of the three.
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Inputs
Result
Pace per km
5:00
min:sec
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Short answer
pace = time ÷ distance. From any two of the three, the third is a single division or multiplication.
What is the Pace Calculator?
Pace expresses running speed as minutes per unit distance — the standard among runners.
How does the Pace Calculator work?
Convert time to seconds. Divide by distance to get pace. Multiply pace by any target distance to project a race time.
Formula
Variables
paceMinutes per unit distancespeedDistance per unit time
Explanation
Pace and speed are inverses. Runners think in pace; cyclists in speed.
Examples
Example 1: 5 km in 25:00
5:00/km pace, ~12 km/h, marathon projection 3:31:00.
Applications
- Race planning
- Interval training targets
- Predicting finish times
Advantages
- Projects longer race times from a shorter effort
- Handles km and miles
Limitations
- Real race pace decays with distance — long projections are optimistic
Common mistakes
- Assuming 5K pace holds at marathon distance
Tips
- Marathon pace is typically 30–60 seconds slower per mile than 5K pace
Related concepts
The Pace Calculator sits inside the Health Calculators hub, in the fitness & training cluster. Intensity, capacity and performance prediction. Understanding the terms below makes the output easier to interpret and easier to compare against neighbouring measures.
Practical use cases and industry applications
Understanding Pace
Pace expresses running speed as minutes per unit distance — the standard among runners. Within health calculators, pace belongs to the fitness & training cluster, where it shares terminology and assumptions with closely related tools.
Learning how pace is calculated
Pace and speed are inverses. Runners think in pace; cyclists in speed. Working through the variables one at a time — pace, speed — makes the result reproducible by hand and easier to sanity-check.
Using pace to make a decision
Race planning Interval training targets Predicting finish times Because outputs depend on the assumptions you enter, run more than one scenario before committing to a figure.
How pace compares with related measures
training zone, aerobic capacity, progressive overload, MET value all describe adjacent aspects of fitness & training. Comparing this calculator's output against those measures — using the related tools listed on this page — prevents a single metric from being read in isolation.
Frequently asked questions
How do I convert between paces?
min/km × 1.60934 = min/mi. So 5:00/km ≈ 8:03/mi.
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