Marathon Training Pace Calculator
Determine your personalised easy, tempo, interval, and long-run training paces from your marathon goal time. Helps structure every week of training to peak on race day.
About this calculator
Effective marathon training requires running at several distinct intensities, not just one generic 'training pace.' The foundation pace — your easy or long-run pace — is derived from your goal marathon pace with an adjustment factor. The formula used here is: easy pace (min/mile) = ((goalHours × 60 + goalMinutes) / 26.2 / 60 × 1.1). Dividing total goal minutes by 26.2 gives your goal mile pace in minutes; multiplying by 1.1 slows it by 10% to place it in the aerobic easy zone. Tempo runs typically sit at goal marathon pace or slightly faster, while interval sessions target 5K race pace. Long runs are performed at easy pace to build aerobic endurance without excess fatigue. Running most of your weekly volume at easy pace is the cornerstone of plans like Hansons, Pfitzinger, and Jack Daniels.
How to use
Goal marathon time: 3 hours 45 minutes (3:45:00). 1. Convert to minutes: (3 × 60) + 45 = 225 minutes. 2. Goal pace: 225 / 26.2 = 8.59 min/mile. 3. Easy/long-run pace: 8.59 / 60 × 1.1 … applying formula: (225 / 26.2 / 60 × 1.1) = 0.1573 hours/mile = 9.44 min/mile. 4. Round: easy pace ≈ 9:27 per mile. Run all easy days and long runs at 9:27/mile; tempo workouts near 8:35/mile; intervals near 7:50/mile.
Frequently asked questions
How do I calculate my easy run pace for marathon training?
Your easy pace should feel conversational — you should be able to speak in full sentences without gasping. Mathematically, it sits roughly 60–90 seconds per mile slower than your goal marathon race pace. Using this calculator, you input your goal time and it applies a 10% slowdown factor to your target race pace to produce your easy training pace. Running too fast on easy days is the most common training mistake, as it accumulates fatigue that compromises quality sessions and increases injury risk.
What is the difference between tempo pace and marathon race pace?
Marathon race pace is the steady, sustained effort you target for all 26.2 miles on race day. Tempo pace — also called lactate-threshold pace — is typically 20–30 seconds per mile faster than marathon race pace and corresponds to roughly 1-hour race effort. Training at tempo pace teaches your body to clear lactate more efficiently, which directly raises the speed you can sustain on race day. Most marathon plans include one tempo session per week of 4–8 miles at this effort.
How should training paces change as a marathon runner gains experience?
As fitness improves, your goal marathon time decreases, which automatically makes all derived training paces faster. Experienced runners can also handle a higher proportion of their weekly mileage at tempo and marathon pace without the same injury or fatigue risk as beginners. Beginners should spend 80–90% of weekly volume at easy pace; advanced runners might push that to 70–75% while adding more quality work. Re-run this calculator each training cycle as your goal time becomes more ambitious to keep all your zones calibrated correctly.