# Pace Calculator

> Calculate running or cycling pace from time and distance, or finish time from pace and distance. Supports km and miles.

URL: https://uttir.com/pace-calculator
Categories: calculators
Privacy: Calculations are local. No data leaves your device.

## About

Two ways to plan a run. Forward: enter a recent run time and distance to get your pace (min/km or min/mi). Reverse: pick a target pace and a distance to see your finish time. Useful for race planning, training zones, and tracking improvements.

Supports both kilometers and miles. Switch the unit to see your pace in the other system without converting numbers by hand.

## How to use

1. **Pick a unit** — Kilometers or miles — affects all displayed values.
2. **Forward: enter time and distance** — See your pace and your speed in the chosen unit.
3. **Reverse: enter pace and distance** — See your predicted finish time.

## Examples

### 50 min for 10 km

Forward mode.

Output:

```
5:00 /km, 12.0 km/h
```

### 5:30 /km for 21.1 km (half marathon)

Reverse mode.

Output:

```
1:56:04
```

## FAQ

### Is pace the same as speed?

No. Pace is the time it takes to cover a unit distance (e.g. min/km). Speed is the distance covered per unit time (e.g. km/h). They are reciprocals. The calculator shows both.

### Why does my pace feel easier on a treadmill?

Treadmill pace is usually a little easier than the equivalent outdoor pace because the belt assists leg turnover. Most runners add 5-10 seconds per km to their treadmill pace for outdoor effort equivalence.

### How do I predict a race time from a training pace?

This calculator works for a single pace. For race prediction from a training run, Riegel's formula is the standard: T2 = T1 × (D2 / D1)^1.06. For most runners, a 5K pace is roughly 90% of a 10K pace, and a half-marathon pace is about 105% of a 10K pace.

## Related tools

- [Percentage Calculator](https://uttir.com/percentage-calculator) — Three percentage tools in one: percent of a value, ratio as a percent, and percent change.
- [Age Calculator](https://uttir.com/age-calculator) — Find the exact age in years, months, and days — plus totals and the countdown to the next birthday.
- [BMI Calculator](https://uttir.com/bmi-calculator) — Calculate your Body Mass Index and see where you fall on the healthy range.
- [Calorie Calculator (BMR + TDEE)](https://uttir.com/calorie-calculator) — Calculate your Basal Metabolic Rate (BMR) and Total Daily Energy Expenditure (TDEE). Includes a goal-adjusted daily calorie target.

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For the full HTML page with the live tool, visit https://uttir.com/pace-calculator.
This file is the markdown rendering at https://uttir.com/pace-calculator.md. See https://uttir.com/llms.txt for a site-wide summary.