Running Pace Calculator — Marathon, 5K and Race Pace

This free running pace calculator turns any distance and finish time into your pace per kilometre, pace per mile, and speed in km/h and mph — all at once. Enter how far you ran, pick kilometres or miles, add your time in hours, minutes and seconds, and every number you need appears instantly. Whether you are checking a recent training run, planning splits for an upcoming race, or setting target paces for a 5K, 10K, half marathon or full marathon, the running pace calculator does the arithmetic so you can focus on the running.

Pace is the single most useful number a runner tracks. It is how coaches prescribe workouts, how races are paced, and how you know — mid-run — whether you are on target. This tool makes that number available in every common format without manual division or unit conversion.

What Is Running Pace and Why It Matters

Running pace is the time it takes to cover one unit of distance, expressed as minutes per kilometre (min/km) or minutes per mile (min/mi). Speed — km/h or mph — describes the same effort from the opposite direction, but pace is how runners naturally plan and communicate. Asking "what pace can I hold for 10K?" is far more practical than converting to an average speed.

Knowing your pace is what turns unstructured jogging into training that actually improves your fitness. Easy runs, long runs, tempo efforts and interval sessions each correspond to a specific pace band, and running each session at the right effort is what drives progress. Even at the elite level, races are run to a pre-planned pace — the discipline of pacing precisely is a skill that separates finishers from personal-best setters at every level.

How to Use This Running Pace Calculator

1. Distance — enter the distance you ran or plan to run.
2. Unit — choose kilometres or miles.
3. Time — enter your finish time in hours, minutes and seconds.
4. Calculate Pace — pace per km, pace per mile, km/h and mph all appear together.

You can work in either direction. Enter a known time for a known distance to find the pace you ran, or enter a goal time to see the pace you will need to hold. The calculator handles any distance, from a 400 m track repeat to an ultramarathon, and shows every measurement in both metric and imperial so you never have to convert by hand.

Marathon Pace Calculator — Plan Your 26.2

To plan a marathon, enter 42.195 km (or 26.2 miles) and your goal finish time. The result is the exact pace per kilometre and per mile you need to sustain from start to finish — the reference every runner should train against to avoid the classic marathon mistake of starting too fast. These common goal times give a sense of the numbers involved:

• Sub-3:00 marathon — approximately 4:15/km (6:50/mile)
• 3:30 marathon — approximately 4:58/km (8:00/mile)
• 4:00 marathon — approximately 5:41/km (9:09/mile)
• 4:30 marathon — approximately 6:24/km (10:18/mile)
• 5:00 marathon — approximately 7:06/km (11:27/mile)

Enter your own goal to get an exact personal target, then rehearse that pace in long runs and marathon-pace segments so race-day effort feels familiar rather than foreign.

Splits and Pace Charts

Once you know your pace per kilometre, any split becomes simple multiplication: pace × segment distance. At 5:00/km, a 5 km checkpoint is 25:00, a 10 km checkpoint is 50:00, and the half-marathon point is roughly 1:45:30. Because the calculator shows min/km and min/mile side by side, you can build a split plan in whichever units your race marks its course. For an even-paced 4:00 marathon, your halfway split should land near 1:59:45 — a quick check that keeps ambition from wrecking the second half.

5K, 10K and Half Marathon Pacing

For shorter races, enter the event distance and your target time to see the pace required. A few reference points:

• Sub-20:00 5K — requires 4:00/km (6:26/mi)
• 25:00 5K — requires 5:00/km (8:03/mi)
• 50:00 10K — requires 5:00/km (8:03/mi)
• Sub-2:00 half marathon — requires 5:41/km (9:09/mi)

Your 5K race pace is a useful anchor for training too — it sits close to your threshold effort, one of the most productive zones for building speed. Publications such as Runner's World and the pacing standards published by World Athletics both emphasise the same principle this calculator supports: know your target pace before you toe the line.

Converting Between km/h, mph and Per-Mile Pace

The tool also works as a pace and speed converter. To turn a per-mile pace into mph, the relationship is speed (mph) = 60 ÷ pace (min/mi); the same logic applies to km/h. Every result shows all four formats at once, which is especially handy if you train in kilometres but race in mile-marked events, or if you need to set a treadmill that only displays speed. Enter a recent 10K time and you can read across to the equivalent marathon or half-marathon pace, giving you an honest snapshot of where your current fitness sits relative to your goal.

Build a Simple Weekly Pace Structure

A balanced training week rarely runs at one pace. As a rough guide, easy and recovery runs sit well slower than race pace (comfortable enough to hold a conversation), long runs are moderately slower, tempo efforts run near your 10K-to-half-marathon pace, and intervals reach 5K pace or faster. Keeping roughly four-fifths of your weekly volume easy is what lets the harder sessions do their job. Use this calculator to pin down the exact numbers for each session type rather than guessing by feel.

Pace never exists in isolation — body weight, energy intake and overall composition all shape how running feels. Estimate your daily calorie needs with our TDEE calculator, check your weight-to-height ratio with the BMI calculator, gauge composition with the body fat calculator, and set a hydration target for long runs with the water intake calculator. Every calculator we offer lives in the free tools hub.

Frequently Asked Questions