Running Pace & Finish Time Calculator — Free & Instant

What this calculator does

Convert pace to finish time and back for any distance, in minutes per kilometre and per mile. Fill in the fields in the calculator above and the results update as you type — nothing is sent anywhere, and there is no sign-up or paywall.

Most people reach for this after a quick mental estimate has already gone wrong: the numbers are close enough to feel right, but the decision behind them is worth real money or real time. Working it out properly takes seconds here.

How to use the tool above

1. Enter your own numbers in these fields: distance, target time.
2. Read Pace per km first — that is the figure most people came for.
3. Change one field at a time to see how sensitive the outcome is. That single habit is what turns a calculator into a decision tool.
4. Note the result somewhere before you compare options, so you are comparing like with like.

The method, in plain words

• Pace per km = target time ÷ the larger of (distance, 0.000001)
• Pace per mile = target time ÷ the larger of (distance × 0.621371, 0.000001)
• Average speed = distance ÷ the larger of (target time ÷ 60, 0.000001)

Nothing here is hidden: the same arithmetic runs in the tool above, so you can reproduce any number by hand if you want to check it.

Worked example 1

What you enter

• Distance: 10.00 km
• Target time: 55 min

What you get

• Pace per km: 5.50 min/km
• Pace per mile: 8.85 min/mi
• Average speed: 10.91 km/h

Worked example 2 — one input doubled

The fastest way to understand any calculation is to move a single input and watch what happens.

What you enter

• Distance: 20.00 km
• Target time: 55 min

What you get

• Pace per km: 2.75 min/km
• Pace per mile: 4.43 min/mi
• Average speed: 21.82 km/h

Comparing the two runs tells you which input actually drives the outcome — and therefore which one is worth negotiating, adjusting or planning around.

Common mistakes to avoid

• Mixing time periods. Monthly, weekly and annual figures cannot be compared until they are converted to the same basis.
• Rounding too early. Round only the final answer; rounding an input first quietly shifts everything after it.
• Forgetting what the number excludes. A clean calculation still leaves out fees, taxes or extras that are specific to your situation — add them separately.
• Treating a single run as the answer. Run a slightly pessimistic version too, then plan against that.

These numbers are general estimates for planning, not medical advice. Talk to a clinician before making changes that affect your health.

Related free tools

Every tool in the Moyan AI library is free, works in the browser and needs no account. Browse the full free tools library, explore hundreds of AI products in the AI Tool Lab, or create a free Moyan AI account to save your work across our learning, career and productivity tools.