How does the calculator predict race times?

It uses the Riegel formula, which estimates race times for different distances based on a known performance at a specific distance.

Can I calculate pace in both miles and kilometers?

Yes, you can select either kilometers (km) or miles (mi) as your distance unit.

What time formats are supported?

You can enter times in HH:MM:SS format, such as 55:00 for fifty-five minutes or 1:30:00 for one hour and thirty minutes.

What variables can I solve for?

You can solve for Pace (using distance and time), Time (using distance and pace), or Distance (using time and pace).

Does the calculator show running speed?

Yes, the output displays your average running speed in kilometers per hour or miles per hour alongside the calculated pace.

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Running Pace Calculator (Distance / Time / Pace)

Solve for pace, finish time or distance given the other two. Enter a known distance and either a finish time or a pace, and get the missing value plus speed and optional Riegel race predictions.

Execution

Run this tool

Fill in the form, run the tool, and review the result in one place.

Prepared example runs

Click an example to fill the form automatically. File inputs still need an upload.

2 examples

10K in 55:00 — find pace

A 10 km run finished in 55 minutes → 5:30/km pace, 10.9 km/h, with an optional half-marathon projection.

<div class="rp-wrap">…pace 5:30/km, speed 10.91 km/h, half-marathon prediction ~2:01:30 via Riegel…</div>

Half marathon at 5:30/km — find time

A runner targeting a 5:30/km pace for a half marathon solves for finish time.

<div class="rp-wrap">…half-marathon time 1:56:00 at 5:30/km, full-marathon projection ~4:02:00…</div>

Inputs

Set the required fields, then run the tool.

7 options

ContentPaste or type the main input values.2

Finish time (HH:MM:SS)textRequiredPace (MM:SS per unit)textRequired

SettingsAdjust formats, ranges, numbers, and modes.5

What to solve forselectOptionalDistancenumberRequiredDistance unitselectOptionalPredict race timeselectOptionalDecimal placesnumberOptional

Result

Ready for a run

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Samples

Running Pace Calculator (Distance / Time / Pace)

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Prepared example runs

Inputs

Result

Examples that match this tool

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Prepared example runs

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Learn when to use this tool, what it supports, and how real users apply it.

Key facts

Overview

When to use

How it works

Use cases

Examples

1. Determining Target Pace for a 10K Race

2. Calculating Finish Time for a Half Marathon

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