Marathon Pace Calculator

A free running pace calculator to convert pace, time, and distance. Enter any two values and calculate the third. Supports min/km, min/mile, km/h, and mph. Mobile-friendly for quick checks before workouts, races, and long runs.

Tip: Click X to clear the field you want to solve for, fill the other two, then click Calculate.
Use presets for Marathon, Half Marathon, 10K, or 5K. You can also enter any custom distance.
hh:mm:ss
Accepted formats: hh:mm:ss, mm:ss, or raw seconds (e.g., 90).
Pace mode: enter mm:ss. Speed mode: enter a number (e.g., 28.5 km/h).
Recommended flow: click X to clear the field you want to compute, fill the other two, then click Calculate.
Formulas:
Time = Distance × Pace (same unit)
Pace = Time ÷ Distance
Distance = Time ÷ Pace
Speed mode uses speed = distance / time (km/h or mph) equivalently.

How this pace calculator works

This pace calculator helps you quickly convert between pace (min/km or min/mile), time, and distance. It is useful for marathon pace planning, estimating finish time for a race, or checking speed for walking and cycling.

Common uses (long-tail searches)

Examples

Notes: This tool does not account for terrain, elevation, heat, wind, fatigue, or fueling. It is a math conversion tool for pace/time/distance.

Feedback: fruitfoxlu@gmail.com — I’d love to hear your ideas, feature requests, or video format needs.

Author: Royce Lu

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