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Pace Calculator | Compute Pace, Speed, and Predicted Race Times

Convert run time and distance into pace per mile or kilometre, speed in mph or km/h, and finish-time projections. The essential tool for runners planning workouts, marathons and training paces.

Last updated: June 2026 · Free · No sign-up required

Results

Enter values above and click Calculate to see your result instantly.

Quick reference

Finish times by pace:

Pace /mi	5K	10K	Half	Marathon
7:00	21:45	43:30	1:31:46	3:03:33
8:00	24:51	49:42	1:44:53	3:29:46
9:00	27:58	55:56	1:58:00	3:55:59
10:00	31:04	1:02:08	2:11:07	4:22:12

monitor_weight A starting point, not a diagnosis

This calculator gives you the same number a clinician would compute by hand from your inputs. It is informational, never a substitute for a doctor. If a result surprises you, write it down and discuss it at your next appointment — that conversation is the goal, not a verdict from a webpage.

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Every health calculator on CalcaTools uses an equation from the WHO, NIH, ACOG, CDC, or a published peer-reviewed paper. The exact citation is in the "Formula & methodology" section. We re-check sources quarterly and update the page when guidance changes — the "Last reviewed" date is at the top.

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Health calculations only help if you can actually use them. We use plain-English labels (no jargon), accept both metric and US units, and show what a "normal" range looks like alongside your result — so you understand what the number means, not just what it is.

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Your weight, height, age, pregnancy details, and any other health input never leave your browser. Calculations run client-side; nothing is logged or stored on our side. We don't want your medical data — we just want the formula to work for you.

Interpretation guide

Pace concepts:

Term	Meaning
Pace	Time to cover one mile or km
Speed	Distance per hour (mph or km/h)
Splits	Time for each segment of a race
Even / negative split	Same or faster second half

lightbulb Worked example

Let's say you are using the Pace Calculator. Enter a distance and the time it took you to run it, and this pace calculator returns your average pace in minutes per mile and minutes per kilometer, plus your speed in mph and km/h. It also Enter the values that match your situation into the input fields and press calculate — using realistic numbers makes the result directly useful for you.

Result: The calculator instantly applies the formula Pace = Time / Distance; Speed = Distance / Time; Finish time = Pace x Distance and returns the result with appropriate precision.

What this means: Read the result in the context of what you are measuring. The step-by-step breakdown lets you confirm the math and understand which input most affects the outcome.

Formula & methodology

Formula: Pace = Time / Distance; Speed = Distance / Time; Finish time = Pace x Distance

The Pace Calculator is built on a well-established calculation method. It uses the formula Pace = Time / Distance; Speed = Distance / Time; Finish time = Pace x Distance to turn your inputs into a reliable result. Enter a distance and the time it took you to run it, and this pace calculator returns your average pace in minutes per mile and minutes per kilometer, plus your speed in mph and km/h. It also predicts finish times for The steps are shown on the page so you can follow the reasoning from input to output.

Pace is simply elapsed time divided by distance, expressed as minutes per mile or kilometer. The calculator converts freely among pace, speed, finish time, and distance so you can plan race goals or training runs. Enter any two values to solve for the third — for example a target marathon time to find the pace you need to hold.

Authoritative source: U.S. Centers for Disease Control and Prevention

Frequently asked questions

How do I calculate running pace?

Enter the required values into the input fields and press the calculate button. The tool applies the formula Pace = Time / Distance; Speed = Distance / Time; Finish time = Pace x Distance and returns the result with a short explanation of each step, so you can check the working yourself.

What pace do I need for a sub-2-hour half marathon?

The Pace Calculator is a free online tool that enter a distance and the time it took you to run it, and this pace calculator returns your average pace in minutes per mile and minutes per kilometer, plus your speed in mph and km/h. it also predicts finish times for common race distances — 5k, 10k, half. You enter a few values, and it returns an accurate result together with a step-by-step explanation, so it works as both a calculator and a quick reference for the underlying concept.

How do I convert pace to mph?

Divide 60 by the pace in minutes per mile: a 10:00/mile pace is 60 ÷ 10 = 6 mph, and an 8:00 pace is 7.5 mph. For km pace, divide 60 by pace in min/km and the result is km/h. The calculator shows pace and speed together — pace is minutes per unit distance, speed is distance per hour, and they are reciprocals.

What is a negative split?

The Pace Calculator is free, private, and accurate: it runs entirely in your browser (no uploads, no accounts), applies the standard calculation, and explains each step so you can verify the result. Enter a distance and the time it took you to run it, and this pace calculator returns your average pace in minutes per mile and minutes per kilometer, plus your speed in mph and km/h. It also predicts finish times for common race distances — 5K, 10K, half There is no limit on usage, and it works on any device.

How do I use pace for training?

Set training paces relative to your race pace or threshold: easy runs at 60–70% effort (about 1–2 min/mile slower than 5K pace), tempo runs near threshold, and intervals at race pace or faster. The calculator's pace-to-speed conversion helps you calibrate treadmill settings and GPS targets. The key principle: most miles easy, hard workouts genuinely hard — pace planning keeps the proportions honest.

What does the Pace Calculator do?

Enter a distance and the time it took you to run it, and this pace calculator returns your average pace in minutes per mile and minutes per kilometer, plus your speed in mph and km/h. It also predicts finish times for common race distances — 5K, 10K, half. The calculator takes your inputs, applies the standard calculation, and returns a clear result so you can make an informed decision without doing the math by hand.

What formula does the Pace Calculator use?

It applies Pace = Time ÷ Distance for your average pace, Speed = Distance ÷ Time for your speed, and Finish time = Pace × Distance for projections. Enter a distance and the time it took to run it, and the tool returns your pace per mile and per kilometre, plus your speed in mph and km/h. A 10 km run in 50 minutes is a 5:00/km pace.

Is the Pace Calculator free and private?

Yes — the Pace Calculator. There is no sign-up, no paywall, no trial, and no limit on how many calculations you can run. CalcaTools covers its costs with non-intrusive display advertising, so the calculator itself never asks for payment or restricts any feature.

How accurate is the Pace Calculator?

The Pace Calculator applies the standard formula: Pace = Time / Distance; Speed = Distance / Time; Finish time = Pace x Distance. It is tested against published worked examples before launch and uses native double-precision arithmetic, so results are accurate to typical precision for the values you enter — with no intermediate rounding that could distort the answer.

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