Use our marathon pace calculator to find the exact per-mile or per-kilometer pace you need to hit your goal finish time. Enter your target marathon time below to get mile-by-mile splits and a complete pacing strategy for race day.
Travelling to a race that uses different units, or running on a treadmill that displays kph or mph? Our race pace conversion chart converts between min/mile, min/km, mph and kph instantly.
This calculator gives you your target pace and even time splits for a marathon race based on your target race time.
The results are shown in both miles and kilometers.
To achieve your target race time, your average pace needs to be the same as the target pace given by the calculator or faster.
Scroll to the bottom of the calculator to download your results as a PDF.
Marathon Pace Calculator
The Honest Truth: A Marathon Pace Calculator Is Riegel Plus Running Economy Plus LT — Not Just Arithmetic
The calculator above divides 26.22 miles by your target time and spits out a pace. The arithmetic is trivial. What the arithmetic hides is that holding that pace for 3 or 4 or 5 hours depends on three physiological variables that shift how accurate the prediction actually is: your fractional utilization of VO2max, your running economy, and your glycogen budget. If you are using this tool to set a goal, the sections below explain what the peer-reviewed literature says about where the straight-line prediction holds up — and where it quietly breaks.
The Riegel And Peterson Formulas: What They Actually Model And Where They Break
Most race-time predictors — including the one on this page when used in “predict from recent race” mode — are built on Pete Riegel’s 1981 endurance formula: T2 = T1 x (D2/D1)^1.06. Riegel derived the 1.06 fatigue exponent from a regression of world-record times across distances.1Riegel PS. Athletic records and human endurance. Am Sci. 1981;69(3):285-290. The formula is only as good as its assumption — that your fatigue curve tracks a world-class athlete’s curve. Greg Maclin and Alan Jones later refined it, and Peterson published an adjusted exponent (closer to 1.08 for amateur marathoners) that nudges predictions slightly slower and, on balance, more accurate for most readers. Joyner’s classic physiological model of marathon performance showed why: predicted times from short-race efforts systematically overshoot marathon performance because they assume equal fractional utilization across durations, but fractional utilization measurably drops as duration extends.2Joyner MJ. Modeling optimal marathon performance on the basis of physiological factors. J Appl Physiol. 1991;70(2):683-687. The calculator’s output is only valid within about 5-8 minutes of actual race-day time for a trained amateur running an even-paced, temperate-weather course. Everything below that accuracy window is noise from the three variables covered next.
Fractional Utilization Of VO2max Caps How Long Threshold Pace Can Be Held
A marathon at goal pace is typically run at 75-85 percent of VO2max for a trained runner. The ceiling on that percentage — called fractional utilization — is the single most variable input between two runners of identical VO2max. Joyner and Coyle formalised endurance performance as the product of VO2max, running economy, and the fraction of VO2max that can be sustained.3Joyner MJ, Coyle EF. Endurance exercise performance: the physiology of champions. J Physiol. 2008;586(1):35-44. Bassett and Howley’s landmark review confirmed lactate threshold (which maps closely to fractional utilization) as a stronger race-day predictor than raw VO2max once the comparison is between trained runners.4Bassett DR Jr, Howley ET. Limiting factors for maximum oxygen uptake and determinants of endurance performance. Med Sci Sports Exerc. 2000;32(1):70-84. Billat and Koralsztein’s work on time sustained at vVO2max added duration specificity: holding 100 percent of vVO2max is measured in minutes, not hours, and the intensity must drop sharply for 2- and 3-hour efforts.5Billat LV, Koralsztein JP. Significance of the velocity at VO2max and time to exhaustion at this velocity. Sports Med. 1996;22(2):90-108. Practical implication: two runners with the same recent 10K time can produce marathon paces 15-25 seconds per mile apart once their LT fractions diverge. A pace calculator cannot see LT, so it assumes you are the median.
Glycogen Arithmetic Sets The 32-km “Wall” That No Pace Calculator Models
The second systematic over-prediction of a pace calculator has a purely metabolic origin. Muscle glycogen stores are finite — roughly 400-500 g in a trained endurance athlete — and depletion happens around the 28-32 km mark at marathon intensity unless exogenous carbohydrate bridges the gap. Rapoport built an explicit metabolic model of marathon performance and showed that the wall is not psychological: it is the predictable point at which fat oxidation must fully take over, and the required pace drops.6Rapoport BI. Metabolic factors limiting performance in marathon runners. PLOS Comput Biol. 2010;6(10):e1000960. Jeukendrup reviewed two decades of tracer studies and placed the gut ceiling for carbohydrate oxidation at roughly 60 g/h for single-transporter glucose and up to 90 g/h for multiple transportable carbohydrates.7Jeukendrup AE. A step towards personalized sports nutrition: carbohydrate intake during exercise. Sports Med. 2014;44(Suppl 1):S25-S33. Stellingwerff and Cox summarised the same evidence specifically for marathon racing: target 60-90 g/h from the 45-minute mark onward to push the wall back toward the finish.8Stellingwerff T, Cox GR. Systematic review: carbohydrate supplementation on exercise performance or capacity of varying durations. Appl Physiol Nutr Metab. 2014;39(9):998-1011. The implication for the calculator: a perfectly even split that the calculator suggests may collapse into a 15-second-per-mile positive split in the final 10 km if fueling is inadequate, regardless of how well the training block went.
When The Straight-Math Prediction Still Lands Within 5 Minutes
The three complications above do not make the calculator wrong — they mean the calculator has a predictable accuracy window. Three cases where the prediction holds tightly: first, as a long-run pace target during training (the calculator is never more useful than when setting a 20-mile long-run at goal pace, because that run is short enough to stay inside the glycogen budget). Second, as a split-planning tool when the athlete is already trained to goal pace and the day is cool and flat; there, even pacing beats positive splits by 2-3 minutes, and the calculator’s uniform splits are exactly what the physiology rewards. Third, as a progression benchmark — comparing this year’s calculator output from a recent half marathon against last year’s same-season prediction is a clean measure of fitness change that is harder to game than perceived effort. For readers deciding whether the calculator’s suggested pace matches a realistic goal time, see our related coverage on what counts as a good marathon time and how actual finishers distribute across the field.
What Should My Marathon Pace Be?
Your marathon pace should reflect your finish time goal for the race, your current fitness level, and your training history. Picking the right pace is one of the most important decisions you will make on race day.
As a general guide, here are typical marathon pace ranges by experience level:
- Beginner runners (first marathon): 10:00–13:00 min/mile (6:12–8:05 min/km), targeting a finish time of roughly 4:20–5:40.
- Intermediate runners: 8:00–10:00 min/mile (4:58–6:12 min/km), targeting a finish time of around 3:30–4:20.
- Advanced runners: 6:30–8:00 min/mile (4:02–4:58 min/km), targeting a finish time of about 2:50–3:30.
- Elite runners: sub-5:00 min/mile (sub-3:06 min/km), targeting sub-2:10 finishes.
Your recent race performances at shorter distances are the best predictor of your marathon pace. If you have a recent half marathon time, you can estimate your marathon pace by adding roughly 10–20 seconds per mile to your half marathon pace.
For more info on how to decide your pacing and time goals, check out our definitive guide to marathon pacing.
How to Calculate Marathon Pace?
Marathon pace is calculated by dividing your target marathon time by the marathon distance (26.22 miles or 42.20 kilometers).
If you want to calculate pace yourself, you need to make sure all of the units are properly converted. For example, a target time of 5 hours and 15 minutes needs to be converted to 315 total minutes before dividing.
Here are two worked examples:
- 4-hour marathon goal: 240 minutes ÷ 26.22 miles = 9:09 per mile (or 240 ÷ 42.2 km = 5:41 per km).
- 3:30 marathon goal: 210 minutes ÷ 26.22 miles = 8:00 per mile (or 210 ÷ 42.2 km = 4:58 per km).
The formula works the other way, too. If you know your comfortable pace from training runs, multiply that pace by 26.22 (miles) or 42.2 (km) to estimate your finish time. A runner comfortable at 9:00 per mile can expect a finish time around 3:56.
Our calculator above handles these conversions instantly, so you can experiment with different goal times and see the required pace immediately.
What Are Split Times? Split Times In Running Explained
A split is a timed section of your run. A split time is typically given for each kilometer or mile of your run. Split times allow runners to break up their run into smaller sections so they can better monitor their speed and progress throughout the run.
Nowadays, most GPS running watches give you the option to log split times for every kilometer or mile.
Some runners aim for even splits, whereby the same amount of time is taken to complete each section of the run. This means that the speed of the runner remains relatively consistent throughout the race.
Other runners aim for negative splits, whereby sections in the second half of the run are completed in less time, meaning that the second half of the race is run faster than the first half of the race. The aim of this is to better maintain a manageable pace, stop burn-out, and give an extra boost of energy and speed towards the end of the race.
You can read our detailed guide on negative splits here.
Marathon Pacing Strategies
Choosing the right pacing strategy can make or break your marathon. There are three main approaches that experienced runners and coaches recommend:
Even pacing means running each mile at roughly the same speed from start to finish. This is the most energy-efficient approach and is used by most elite marathoners. If your goal is a 4:00 marathon, you would aim for approximately 9:09 per mile for every single mile.
Negative splitting means running the second half of the marathon faster than the first half. This strategy requires discipline in the early miles but helps you avoid the dreaded late-race wall. Many coaches recommend starting 10–15 seconds per mile slower than your goal pace for the first 10 miles, then gradually increasing to goal pace and beyond.
Progressive pacing is similar to negative splitting but involves a more gradual acceleration throughout the entire race rather than a clear first-half/second-half divide. This works well for runners who struggle with patience in the opening miles.
For most recreational runners, even pacing or a slight negative split produces the best results. You can use the pace calculator above to determine your target per-mile or per-kilometer pace, then practice holding that pace during your marathon training long runs.
Common Marathon Pacing Mistakes
Even experienced runners fall into pacing traps on race day. Here are the most common mistakes to avoid:
Going out too fast is the number one marathon pacing mistake. The excitement of race day, the crowds, and the adrenaline make it tempting to run your opening miles well ahead of goal pace. This burns through glycogen stores early, and you pay for it with a painful slowdown after mile 18–20. Use the splits from our calculator as your guardrails for those crucial early miles.
Ignoring hills in your pace plan is another common error. If your marathon course has significant elevation changes, your per-mile pace will naturally vary. Plan to run slightly slower on uphills and slightly faster on downhills while keeping your overall effort level consistent.
Not accounting for weather conditions can derail even the best pace plan. Heat and humidity slow you down significantly. As a rule of thumb, for every 10°F (5.5°C) above 55°F (13°C), expect your pace to slow by roughly 1–2% — and adjust your target time accordingly.
Skipping race-pace training runs means your body is not prepared to sustain your goal pace. Include tempo runs and marathon-pace long runs in your training so that your target pace feels familiar and sustainable on race day.
How Can I Use The Marathon Calculator?
The marathon pace calculator has many uses. Here are some examples:
Calculating How Fast You Should Run Based On A Target Finish Time
If you’ve got a target finish goal time in mind – enter it into the calculator above and hit calculate to find out what pace you need to maintain to beat it.
Top tip: always aim for a race pace a bit faster than your target pace to give yourself a bit of headroom and account for small unexpected delays.
Finding Out The Pace Of A Famous Marathon Time You’ve Seen
You might have heard of Eliud Kipchoge running a sub-2-hour marathon.
Are you curious as to what pace this equates to and how it holds up compared to your 5K pace?
Enter it into the calculator and find out (hint – it’s fast).
Marathon Pace Charts
Marathon Pace Chart – Miles/Imperial (US)
Marathon Pace Chart – Kilometers/Metric
Other Running Calculators
- Half Marathon Pace Calculator
- Custom Running Pace Calculator
- Race Time Calculator: Predict Your Race Finish Times
- Marathon Time Predictor: Calculate Your Marathon Race Time
- Age-Grade Calculator: Analyse, Compare, & Predict Races
FAQs
What Is A Good Marathon Pace?
There is no universal ‘good’ pace for the marathon race distance, as everyone has their own marathon goals and levels of fitness.
A good pace for beginners unaccustomed to running longer distances differs from a good pace for experienced ultramarathon runners.
You can check out our guide on how some people might define a good or average pace here.
How To Achieve My Target Pace And Finish Time?
Once you’ve determined your target pace and finish line time goal – check out one of our specific finish-time goal-based marathon training plans to help you get there reliably, safely, and injury-free.
Our in-depth training programs include weekly training runs, with tempo runs and speed work to help increase your lactate threshold, VO2 max, & threshold pace whilst increasing running speed, power, and running economy, complemented by easy runs and weekend long runs to help build your long-distance stamina and strength training to build strength and prevent injury.
Bear in mind that your training paces are not always going to be run at the same pace as your target race day pace.
What Pace Do I Need For A Sub-4-Hour Marathon?
To finish a marathon in under 4 hours, you need to maintain an average pace of approximately 9:09 per mile (5:41 per km) or faster. In practice, most sub-4 runners aim for 9:05 per mile to build in a small cushion for water stops and any late-race slowdown.
Should I Run Even Splits Or Negative Splits In A Marathon?
For most runners, even splits are the safest and most efficient strategy. Negative splits — running the second half faster than the first — can produce excellent results but require significant discipline. If this is your first marathon, focus on even pacing. More experienced runners can experiment with running the first half 30–60 seconds slower than their target and then picking up the pace.
How Does Weather Affect Marathon Pace?
Temperature, humidity, and wind can significantly impact your marathon pace. Ideal marathon conditions are around 45–55°F (7–13°C) with low humidity. For every 10°F above this range, expect to slow down by roughly 1–2%. On hot days, it is better to adjust your goal pace downward from the start rather than trying to maintain your original target and hitting the wall.
How Do I Predict My Marathon Time From A Half Marathon?
A common approach is to double your half marathon time and add 10–20 minutes. A more precise method is to multiply your half marathon time by 2.1. For example, a 1:45 half marathon (105 minutes) predicts a marathon time of around 3:40 (220 minutes). You can also use our marathon time predictor for a more personalized estimate based on your race history.
