How do I calculate marathon pace from a goal finish time?

Divide total seconds by marathon distance. Official length: 42.195 km (26.2188 mi). Example — 3:30:00 = 12,600 s: 12,600 ÷ 26.2188 ≈ 480.5 s/mi → 8:00 /mi; 12,600 ÷ 42.195 ≈ 298.6 s/km → 4:58 /km. Average speed: 7.49 mph / 12.06 km/h. Enter hours, minutes, and seconds in the calculator for any goal time.

What distance does this marathon pace calculator use?

World Athletics certified marathon: 42.195 km = 26 miles 385 yards ≈ 26.2188 miles. Some apps round to 26.2 mi (about 0.2% short) — that makes pace look slightly faster than reality. This tool uses the full certified length so pace bands match major marathons (Boston, Chicago, Berlin, NYC, London).

What pace do I need for a sub-4-hour marathon?

Even splits: 4:00:00 → 9:09 /mi and 5:41 /km (6.55 mph average). Halfway (13.1 mi) at even pace ≈ 1:59:54 on the clock. Most runners add 1–3% for hills, heat, or conservative starts — practice 5:41 /km in long tempo segments before race day.

What is the pace for a 3:30 or 3:00 marathon?

3:30:00 → 8:00 /mi / 4:58 /km (7.49 mph). 3:00:00 → 6:51 /mi / 4:15 /km (8.74 mph). Holding 8:00/mi for every mile yields 3:29:45 (not 3:30:00) because 26.22 mi × 480 s ≈ 12,585 s — about 15 seconds under 3:30 on paper.

How do I convert pace per mile to pace per kilometer?

Same speed, different units: pace per km = pace per mile ÷ 1.609344 (since 1 mi ≈ 1.609 km). Example: 8:00/mi (480 s) ÷ 1.609344 ≈ 298 s → 4:58 /km. Reverse: 5:00/km × 1.609 ≈ 8:02/mi → marathon about 3:30:58. The calculator shows both automatically from one input.

How accurate is predicted marathon time from training pace?

This page is pure arithmetic (pace × 26.22 mi = time). Real races vary with elevation, weather, fueling, caffeine, sleep, and pacing strategy. A half marathon at ~1:44:55 (even 3:30 effort through 13.1 mi) does not guarantee 3:30 — marathon fatigue usually appears after mile 20 (~2:40:11 at 3:30 even pace). Use predictions as planning baselines; validate with 18–22 mile long runs and tune-up races.

What is a good marathon pace for beginners?

Depends on base fitness — no universal “good” pace. Reference bands (even effort): sub-5:00 finish ≈ 11:26 /mi; sub-4:30 ≈ 10:17 /mi; sub-4:00 ≈ 9:09 /mi. Many first-timers prioritize finishing healthy over a arbitrary clock. Compare easy-run and long-run paces to race pace — marathon effort is typically faster than easy miles but slower than 10K race pace.

How does average speed relate to marathon pace?

Equivalent views of the same run. 3:30 marathon → 7.49 mph = 26.22 mi ÷ 3.5 h, and 12.06 km/h = 42.195 km ÷ 3.5 h. Treadmill users often set mph/km/h; watch users often use min/mile or min/km — we display all four.

Should I run even splits in a marathon?

Even splits (same 8:00 /mi every mile) are a useful math model. Many elites negative-split (second half faster). Recreational runners often fade 2–5% in the final 10K. Starting 10–15 s/mi slower than calculated race pace can improve late-race execution on hot or hilly courses. Use this tool for the target average, then adjust first-half effort with conditions.

Does this include half marathon or other distances?

This page is fixed at the full marathon only. For 5K, 10K, half marathon, or custom distances, use our pace calculator. For training-zone paces (easy, marathon, threshold), see marathon training pace zones. Half marathon split at 3:30 even pace: 1:44:55 at mile 13.1.

Why is 26.2 miles not exactly the marathon?

26.2 mi is a common shorthand; certified courses are 26 mi 385 yd = 26.2188 mi. Using 26.2 underestimates distance by ~0.07 mi (~7 s at 8:00/mi). Over 26.2188 mi, 8:00/mi → 3:29:45, not 3:30:00. For serious goal-setting, use the official length (this calculator does).

What pace is a 2:30 or 2:45 marathon?

2:30:00 → 5:43 /mi / 3:33 /km (10.49 mph) — elite amateur / competitive territory. 2:45:00 → 6:17 /mi / 3:54 /km. These require sustained training volume and recovery; the math is simple — the physiology is not.

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Running & racing · 42.195 km

Marathon Pace Calculator — Goal Time, Min/Mile & Min/Km

Free marathon pace calculator for the official 26.22 mi / 42.195 km distance. Enter a goal finish time to see pace per mile and kilometer, or enter pace to predict marathon time — plus average mph and km/h.

Last updated: May 25, 2026

3:30 goal → 8:00/mi · 4:58/km (default)

Pace → finish time on certified distance

Goal-time chart from 2:30 to 5:00

Other race distances? General pace calculator

Marathon Pace Calculator

Full marathon (26.22 mi / 42.195 km) — pace, time, and speed

What do you want to enter?

Goal finish time

Hours

Minutes

Seconds

Results

Marathon finish time

3:30:00

Pace / mile

8:00 /mi

Pace / km

4:58 /km

Avg speed

7.49 mph

Avg speed

12.06 km/h

Race-day tips

Pace assumes even splits; most runners plan a slight fade or negative split.
Course profile, weather, and aid stations affect sustainable pace.
Use with our general pace and heart-rate tools for training zones.

Default snapshot (3:30:00 goal)

Pace per mile

8:00 /mi

Even splits over 26.22 mi

Pace per km

4:58 /km

42.195 km official

Average speed

7.49 mph · 12.06 km/h

Finish 3:30:00

Pace → time examples

8:00 /mi

3:29:45

5:00 /km

3:30:58

4:00:00 goal

9:09 /mi

Marathon goal time → pace chart

Even-pace model on 26.2188 mi / 42.195 km. Click the calculator to customize.

Goal finish	Pace / mile	Pace / km	Avg mph	13.1 mi split
2:30:00	5:43 /mi	3:33 /km	10.49	1:14:56
3:00:00	6:51 /mi	4:15 /km	8.74	1:29:56
3:30:00	8:00 /mi	4:58 /km	7.49	1:44:55
4:00:00	9:09 /mi	5:41 /km	6.55	1:59:54
4:30:00	10:17 /mi	6:23 /km	5.83	2:14:54
5:00:00	11:26 /mi	7:06 /km	5.24	2:29:53

Core formulas

pace (sec/mi) = finish time (sec) ÷ 26.2188 mi
pace (sec/km) = finish time (sec) ÷ 42.195 km
finish time (sec) = pace (sec/mi) × 26.2188 mi
pace/km ≈ pace/mi ÷ 1.6093

Limitations

Assumes even average pace over the full 42.195 km — not walk breaks, surges, or aid-station stops
Does not adjust for course elevation, heat, wind, or altitude (same splits feel harder on hilly or hot days)
Uses certified marathon length (26.2188 mi), not informal 26.0 or 26.2 shortcuts some apps use
Race-day tangents and GPS drift can add 0.2–0.5+ miles to watch distance vs certified line
Planning tool only — validate goal time with long runs, tune-up races, and coach or training plan

References

World Athletics — marathonOfficial 42.195 km (26 mi 385 yd)
NIST SP 811Mile ↔ kilometer conversion

Worked examples

8:00 per mile steady

Classic sub-3:30 training benchmark pace

Finish: 3:29:45 · Pace: 8:00 /mi · 4:58 /km · Speed: 7.50 mph

5:00 per km steady

Metric race-pace session

Finish: 3:30:58 · Pace: 8:02 /mi · 5:00 /km · Speed: 7.46 mph

4:00:00 goal

Even splits on certified course

Finish: 4:00:00 · Pace: 9:09 /mi · 5:41 /km · Speed: 6.55 mph

Step-by-step: 3:30:00 → pace

1. Convert time: 3 h × 3600 + 30 × 60 = 12,600 seconds.

2. Per mile: 12,600 ÷ 26.2188 = 480.5 s → 8:00 /mi.

3. Per km: 12,600 ÷ 42.195 = 298.6 s → 4:58 /km.

4. Halfway checkpoint (13.1 mi): 1:44:55 at even effort.

Frequently Asked Questions

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Running & racing · 42.195 km

Marathon Pace Calculator — Goal Time, Min/Mile & Min/Km

Last updated: May 25, 2026

3:30 goal → 8:00/mi · 4:58/km (default)

Pace → finish time on certified distance

Goal-time chart from 2:30 to 5:00

Other race distances? General pace calculator

Marathon Pace Calculator

Full marathon (26.22 mi / 42.195 km) — pace, time, and speed

What do you want to enter?

Goal finish time

Hours

Minutes

Seconds

Results

Marathon finish time

3:30:00

Pace / mile

8:00 /mi

Pace / km

4:58 /km

Avg speed

7.49 mph

Avg speed

12.06 km/h

Race-day tips

Pace assumes even splits; most runners plan a slight fade or negative split.
Course profile, weather, and aid stations affect sustainable pace.
Use with our general pace and heart-rate tools for training zones.

Default snapshot (3:30:00 goal)

Pace per mile

8:00 /mi

Even splits over 26.22 mi

Pace per km

4:58 /km

42.195 km official

Average speed

7.49 mph · 12.06 km/h

Finish 3:30:00

Pace → time examples

8:00 /mi

3:29:45

5:00 /km

3:30:58

4:00:00 goal

9:09 /mi

Marathon goal time → pace chart

Even-pace model on 26.2188 mi / 42.195 km. Click the calculator to customize.

Goal finish	Pace / mile	Pace / km	Avg mph	13.1 mi split
2:30:00	5:43 /mi	3:33 /km	10.49	1:14:56
3:00:00	6:51 /mi	4:15 /km	8.74	1:29:56
3:30:00	8:00 /mi	4:58 /km	7.49	1:44:55
4:00:00	9:09 /mi	5:41 /km	6.55	1:59:54
4:30:00	10:17 /mi	6:23 /km	5.83	2:14:54
5:00:00	11:26 /mi	7:06 /km	5.24	2:29:53

Core formulas

pace (sec/mi) = finish time (sec) ÷ 26.2188 mi
pace (sec/km) = finish time (sec) ÷ 42.195 km
finish time (sec) = pace (sec/mi) × 26.2188 mi
pace/km ≈ pace/mi ÷ 1.6093

Limitations

Assumes even average pace over the full 42.195 km — not walk breaks, surges, or aid-station stops
Does not adjust for course elevation, heat, wind, or altitude (same splits feel harder on hilly or hot days)
Uses certified marathon length (26.2188 mi), not informal 26.0 or 26.2 shortcuts some apps use
Race-day tangents and GPS drift can add 0.2–0.5+ miles to watch distance vs certified line
Planning tool only — validate goal time with long runs, tune-up races, and coach or training plan