Marathon Pace Calculator: Splits, Pace per Mile and Km, Fuelling Schedule (UK 2026)
Enter your goal finish time. Get your exact pace per mile, pace per km, all 26.2 mile splits, all 42.2 km splits, and a fuelling schedule. Built for UK runners.
Enter your goal marathon finish time. We give you the exact pace per mile and per km you need, all 26.2 mile splits, all 42.2 km splits, and when to take each gel.
Most marathon attempts fail because of pacing. The first 13 miles should feel easy. If they don't, you'll pay for it later.
Edge builds the marathon training around your goal pace, with adaptive starting plan, Flexi Swap, and Edge AI to adjust your week.
Most marathon plans tell you what to run on Tuesday and how long to go on Sunday. Very few tell you the exact pace you need to run on race day to hit your goal. That is the number that matters more than any other, and it is the number that decides whether your training pays off or you walk the final six miles wondering what went wrong.
This calculator gives you that number. Put in the finish time you want, and you get the pace per mile and pace per kilometre you have to hold from the start line to the finish line. You also get every split along the way, so you can write them on your arm, set them on your watch, or tape them inside your race vest. You see exactly when to take each gel, because fuel timing is the second thing most runners get wrong.
It is built for UK runners, which means we show miles and km side by side, we account for the way most British marathons mark every mile and every 5K, and we follow the fuelling rhythm that works for a typical road marathon in Manchester, London, Edinburgh, or Brighton. Type your goal in. Read your numbers. Then keep scrolling for how to actually use them on the day.
Marathon Pace Calculator
Set your goal finish time, then read off your pace, splits, and gel timing.
Guidance for healthy adult runners. Pace is what you aim for. Race-day weather, course profile, and your nutrition strategy will move the real number.
How to use this calculator
Start with the finish time you genuinely believe you can hold for the full distance. Not the time you wish you could run, not the time your friend ran last year, the time that matches your recent half marathon, your long run pace, and your weekly mileage. If your most recent half marathon was 2:00, a sensible first marathon goal is in the 4:15 to 4:30 region. The classic rule is half marathon time times two, plus ten to twenty minutes for the second half slowdown, although a well-trained runner with strong long runs can close that gap.
Once you set the slider, look at the pace per mile and pace per km card. That is the number you want to hold every mile for the whole race. Scroll down to the splits. If you run a UK road marathon, mile markers are usually large blue boards on the verge. Glance at your watch as you pass each one and compare to the split table. If you are running 20 to 30 seconds quick in the first ten miles, you are not having a good day, you are having a bad day in slow motion. Pull it back.
Finally, look at the fuelling schedule. Set your watch to vibrate every 30 minutes, or stick the gel times on a wristband. Take the first gel earlier than you think you need it. The whole point of in-race fuel is to be ahead of the deficit, not chasing it.
Why marathon pacing matters more than fitness
The first-half trap
At mile two of a marathon, goal pace feels like jogging. Your legs are fresh, the crowd is loud, the adrenaline is up, and you are sitting in a pack that is running 15 to 20 seconds per mile too fast. This is the single biggest reason marathons go wrong. The energy cost of running 15 seconds per mile too quick over the first 13 miles is paid back at roughly three to four times the rate over the final 10K. You bank three minutes early and you spend twelve minutes late. The first half should feel almost embarrassingly easy. If it does not, you are already in trouble and you have not yet noticed.
The negative split goal
The best marathons, from elites to first-timers, are run as negative splits. That means the second half is faster than the first. The reason is simple. Glycogen, hydration, and muscle elasticity all decline through the race, so any pace that feels easy at mile two will feel hard at mile twenty. Starting slightly under goal pace for the first 10K, settling into goal pace through the middle, and lifting in the final 10K is the structure that works. If you can finish the last six miles faster than you started, you almost always hit your goal.
The 5-second-per-mile rule
A well-paced marathon should not drift by more than 5 seconds per mile across the whole race. If your goal pace is 9:00/mile, your slowest mile should be no worse than 9:30 and your fastest no quicker than 8:30, ideally tighter than that. When pace starts drifting by 10, 15, 20 seconds per mile in the final 10K, that is the wall, that is dehydration, that is under-fuelling, or that is a too-fast start catching up. Use this calculator to know the number. Then defend it.
Common marathon goal times and what they mean
- Sub-3:00 (6:52/mile, 4:16/km) the elite amateur club. Around 7 percent of UK marathon finishers. Usually 50 to 70 miles per week training, with a 1:25 half marathon underpinning it.
- Sub-3:30 (8:01/mile, 4:59/km) strong club runner. Roughly 15 percent of UK finishers. A 1:38 half marathon, 40 to 55 miles a week.
- Sub-4:00 (9:09/mile, 5:41/km) the most common serious target. Around a third of UK finishers go under four hours.
- Sub-4:30 (10:18/mile, 6:24/km) sits very close to the median UK marathon time. A solid, well-trained first or second marathon.
- Sub-5:00 (11:27/mile, 7:06/km) the committed first-timer goal. Big achievement, well within reach with a structured 16-week build.
- Just finishing (5 to 7 hours) the real win. Crossing the line in your first marathon is more meaningful than the number on the clock, and the calculator works just as well at 6:00 finish goal as at 3:00.
Fuelling schedule explained
Your body stores roughly 1,800 to 2,000 calories of glycogen, your fast-access fuel. A marathon burns 2,500 to 3,000 calories for most runners. That gap is the wall. If you do nothing about it, you run out around mile 18 to 20. Fuelling in race is the fix, and the standard rhythm that works for most marathons is one gel every 30 minutes, starting at the 30-minute mark, taken with a few sips of water.
The gel-every-30 default in this calculator comes from one piece of physiology. Most gels deliver 20 to 25 grams of carbohydrate, and the gut can absorb 60 to 90 grams of carbohydrate per hour during exercise. Two gels in an hour gives you 40 to 50 grams, which is comfortably in the absorbable range for most runners without GI distress. If you have a strong gut, switch to every 25 minutes. If you have a sensitive stomach, every 45 minutes is safer, but you will need to fuel hard the night before and the morning of.
Caffeine is the optional extra. A caffeinated gel at the 90-minute mark and another at 2:30 gives most runners a real lift in the final third. Water is non-negotiable. Take a few mouthfuls at every aid station, more in warm weather. Never try a new gel, drink, or strategy on race day. Every nutrition choice should be rehearsed in long runs first.
Pace conversion: minutes per mile vs km
UK race signage flips between miles and km depending on the event, so it helps to know both. Use this as a quick reference.
| Pace per mile | Pace per km | Marathon finish |
|---|---|---|
| 6:52 | 4:16 | 3:00:00 |
| 8:01 | 4:59 | 3:30:00 |
| 9:09 | 5:41 | 4:00:00 |
| 10:18 | 6:24 | 4:30:00 |
| 11:27 | 7:06 | 5:00:00 |
| 12:35 | 7:49 | 5:30:00 |
| 13:44 | 8:32 | 6:00:00 |
How Edge uses your goal time
When you set a marathon goal in Edge, your plan is built around the pace you need to hold. Your adaptive starting plan is generated from your current fitness, your training history if you have synced Strava, Garmin, Apple Watch, or Coros, and the race date you set. The pace targets on your easy runs, tempo runs, intervals, and long runs all anchor back to that goal marathon pace, so every session you do is preparing your body for the specific demand of race day.
If life gets in the way, Flexi Swap lets you move sessions around without breaking the plan. Missed Tuesday because of work, want to push the long run from Sunday to Saturday because of the weather forecast, Flexi Swap handles it. Edge AI is the second piece. Ask it about a session, ask it about your taper, ask it whether you should run through a niggle, and it will answer based on your plan and your recent training in 30 seconds.
The plan includes general strength and mobility work alongside the running, so your hips, glutes, and core get the load they need to stay healthy across a 16-week build. Coach video demos sit next to the general strength and mobility moves in your plan. Progress is tracked across the whole plan so you can see, weekly, whether your training is on track for the pace you typed into this calculator. 17,000+ UK members are using Edge to train smarter right now. The 7-day free trial gives you the whole plan, and after that it is £19.99 monthly or £119.99 annual.
Train for the pace you just calculated
Edge builds your marathon plan around your goal pace. Adaptive starting plan, Flexi Swap, Edge AI in 30 seconds, general strength and mobility built in. Making fitness feel good for everyone.
Start your free 7-day trialKeep reading
- Half marathon time predictor: estimate your finish from a recent race
- Hitting the wall: what it is and how to avoid it
- Long slow distance running for beginners
- Race day checklist for your first 5K, 10K, or half marathon
FAQs
How do I calculate my marathon pace?
Divide your goal finish time in minutes by 26.2 for pace per mile, or by 42.195 for pace per km. A 4:00 marathon is 240 minutes, which gives 9:09 per mile and 5:41 per km. This calculator does it for you and gives you every split, so you do not have to do the maths under race-day pressure.
What is a good marathon pace for a beginner?
For a first marathon in the UK, a finish time between 4:30 and 5:30 is a strong, realistic goal for most committed runners with 12 to 16 weeks of training. That is roughly 10:18 to 12:35 per mile, or 6:24 to 7:49 per km. Crossing the line at any pace on your first attempt is the real win.
How many gels should I take in a marathon?
For most runners, one gel every 30 minutes from the 30-minute mark, which works out to between 5 and 9 gels depending on your finish time. A 4:00 marathoner takes around 7 gels. A 5:00 marathoner takes around 9. Practise your exact gel brand and timing in long runs before race day so your gut is used to it.
What is negative splitting in a marathon?
Negative splitting means running the second half faster than the first. It is the structure most well-paced marathons follow. Glycogen, hydration, and muscle freshness all decline through the race, so a pace that feels easy at mile two will feel hard at mile twenty. Starting slightly conservative and lifting in the final 10K is the best way to hit your goal.
How do I convert marathon pace from miles to km?
Multiply pace per mile by 0.6214 to get pace per km, or divide pace per km by 0.6214 to get pace per mile. A 9:00 mile is roughly a 5:35 km. A 5:00 km is roughly an 8:03 mile. The pace conversion table above gives you the common marathon goal paces in both units.
What is the average marathon time UK?
The median UK marathon finish time sits in the 4:25 to 4:40 region for men, and 4:50 to 5:05 for women, varying by race. London Marathon tends to skew slightly faster because of the field, while smaller spring marathons sit closer to the national median. Anything under 5 hours is a solid, well-trained finish.
