Marathon Calculator
Calculate your marathon pace, predict your finish time from shorter races, generate mile-by-mile splits, estimate calories, and plan walk break strategies for 26.2 miles.
Marathon Pace Calculator
Enter your target finish time to find your required pace per mile and km
Your Required Pace
--:--
per mile
--:--
per km
Marathon Facts
A marathon is exactly 26.2188 miles or 42.195 kilometers. The distance was standardized at the 1908 London Olympics when the course was extended so the finish line would be in front of the royal box at the Olympic stadium.
Over 1.1 million people finish a marathon in the United States each year. The six World Marathon Majors are Boston, New York City, Chicago, London, Berlin, and Tokyo. Berlin is considered the fastest course due to its flat profile.
The men's world record is 2:00:35 by Kelvin Kiptum (Chicago, 2023). The women's world record is 2:09:56 by Ruth Chepngetich (Chicago, 2024). Both of these records shattered previous marks by significant margins.
Your body stores roughly 2,000 calories of glycogen. A marathon burns 2,500 to 3,500 calories. This deficit is why "hitting the wall" is so common around mile 20 and why mid race fueling with gels, chews, or sports drinks is essential for most runners.
Average Marathon Times by Age
Based on aggregated finish data from major U.S. marathons.
How to Use This Marathon Calculator
This calculator brings together six essential marathon tools in one place. The Pace tab instantly converts any target finish time into per mile and per kilometer pace. The Time tab does the reverse. The Predict tab uses three models (Riegel, Cameron, and an adjusted fatigue model) to estimate your marathon potential from a 5K, 10K, or half marathon result.
The Splits tab creates a full 26 mile split chart with an option to toggle between even splits and negative splits. Print this table and carry it on race day. The Calories tab estimates your total energy expenditure based on body weight, which is valuable for planning your recovery nutrition. The Walk Breaks tab uses the Galloway method to calculate how run/walk intervals affect your overall finish time.
For dedicated pace analysis, try our marathon pace calculator. For complete pace charts you can print, see the marathon pace chart. To explore structured training programs for specific goal times, browse our training plans.
Make Every Training Mile Count Toward Territory
Marathon training blocks are long. Sixteen to twenty weeks of early alarms, tempo runs, and 20 mile Saturdays. Motera makes each of those runs purposeful by turning every mile into territory on a real world map. Watch your captured area grow as your fitness builds.
Compete with runners in your city, earn XP for every run, and explore new routes through Fog of War. Your marathon build becomes a game you actually look forward to.
MoteraFrequently Asked Questions
How long does it take to run a marathon?
The average marathon finish time in the United States is approximately 4 hours and 21 minutes for men and 4 hours and 48 minutes for women. Beginners typically finish between 4:30 and 5:30. Competitive club runners aim for sub 3:00 to 3:30. The world record is 2:00:35 for men (Kelvin Kiptum, 2023) and 2:09:56 for women (Ruth Chepngetich, 2024).
What pace do I need to run a sub 4 hour marathon?
To finish a marathon under 4 hours, you need to average approximately 9:09 per mile or 5:41 per kilometer. In practice, aim for 9:00 per mile to build in a small cushion for water stops, hills, and the natural slowdown that happens after mile 20. A sub 4 hour marathon is a common goal for intermediate runners.
How do I predict my marathon time from a half marathon?
The Riegel formula multiplies your half marathon time by 2.0929 to predict your marathon. For example, a 1:45 half marathon predicts roughly a 3:40 marathon. However, the actual ratio for most runners is closer to 2.1 to 2.2, because marathon fatigue is disproportionately harder. If you have not done marathon specific long runs (18 to 22 miles), add 5 to 10 minutes to the Riegel prediction.
What is the wall in a marathon?
The wall typically hits between miles 18 and 22. It happens when your body depletes its glycogen (stored carbohydrate) reserves and has to rely more heavily on fat for fuel. Fat burns slower than glycogen, so your pace drops significantly. Proper fueling during the race (30 to 60 grams of carbs per hour), adequate long runs in training, and conservative early pacing are the best ways to avoid or minimize the wall.
Should I use walk breaks during a marathon?
Walk breaks are a legitimate strategy used by hundreds of thousands of marathon finishers. The Jeff Galloway method recommends running for a set interval (such as 4 minutes) then walking for 30 to 60 seconds. Many runners finish faster with planned walk breaks than by trying to run the entire distance, because the walking intervals reduce cumulative fatigue and keep your legs fresher for the final miles.
How many calories does a marathon burn?
A marathon burns roughly 2,400 to 3,000 calories for most runners. The exact number depends on body weight, pace, and running efficiency. A 150 pound runner burns approximately 2,600 calories. A 180 pound runner burns closer to 3,200 calories. This is why fueling during the race is essential. You cannot carry enough glycogen to cover the full 26.2 miles without replenishing.
What is negative splitting in a marathon?
Negative splitting means running the second half of the marathon faster than the first half. This is considered the optimal pacing strategy for marathons. Start 15 to 20 seconds per mile slower than goal pace through mile 8, settle into goal pace for miles 9 through 18, then gradually pick up through the finish. Nearly every marathon world record has been set with a negative or near even split.
How long should I train for a marathon?
Most marathon training plans are 16 to 20 weeks long. Beginners should have a base of at least 20 to 25 miles per week and be comfortable running 6 to 8 miles before starting a plan. The longest training run is typically 20 to 22 miles, done 2 to 3 weeks before race day. First time marathoners should prioritize finishing over a time goal.
Related Tools and Guides
