Marathon Pace Calculator: Boston, NYC, Chicago Goal Times

26.2 miles is unforgiving. There is no margin to recover from going out too fast. Pacing is the difference between the runner who feels strong at mile 22 and the runner who walks the last 4 miles. This calculator gives you the per-mile pace for any marathon goal time, plus the pacing notes that actually matter for the back half.

free pace calculator runs the live math. The chart and notes below cover Boston qualifying, sub-4, sub-3:30, and the realistic targets for first-time marathoners.

Marathon Finish Time → Required Pace

Goal Time	Pace per Mile	Pace per Km	Notes
2:30:00	5:43	3:33	Sub-elite
2:45:00	6:18	3:55	Strong club runner
3:00:00	6:52	4:16	Boston for many ages
3:10:00	7:15	4:30	Boston M 18-34
3:15:00	7:26	4:37	Boston M 35-39 / W 18-34
3:25:00	7:49	4:51	Boston W 35-39
3:30:00	8:01	4:59	Common goal
3:45:00	8:35	5:20	Strong intermediate
4:00:00	9:09	5:41	The big benchmark
4:15:00	9:44	6:03	Median finisher
4:30:00	10:18	6:24	Comfortable target
4:45:00	10:52	6:45	First-timer target
5:00:00	11:27	7:07	Run-walk territory
5:30:00	12:35	7:49	Walk-friendly
6:00:00	13:44	8:32	Cutoff for most majors

The single most popular marathon goal is sub-4:00 (9:09/mile). The next is sub-3:30 (8:01/mile). After that runners chase Boston Qualifier (BQ) times, which depend on age and gender — see boston-marathon.org for current qualifying standards.

Boston Qualifying Times

Boston qualifying standards are age- and gender-graded. The BAA tightens cutoffs over time, so always check the official current standards before planning. Approximate recent standards:

• Men 18-34: 3:00:00
• Men 35-39: 3:05:00
• Men 40-44: 3:10:00
• Women 18-34: 3:30:00
• Women 35-39: 3:35:00
• Women 40-44: 3:40:00

"Qualifying" rarely means getting in. The Boston field is capped, and runners who beat their qualifying time by 5+ minutes have much better odds of acceptance. Plan to run 4-7 minutes under the standard if you actually want a bib.

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The Sub-4 Marathon Strategy

Sub-4 hours = 9:09/mile = 5:41/km. The pace itself is not hard for most trained runners. The hard part is holding it for the back half when fatigue, dehydration, and glycogen depletion are all working against you.

Three things separate sub-4 finishers from "almost-sub-4" finishers:

• Long-run base: at least 4-5 long runs of 18-20 miles before race day
• Conservative first half: first 13.1 in 2:00:30 to 2:01:30, not 1:58
• Real fueling: 30-60g of carbs per hour, water at every aid station

The math: if you run the first half in 1:58, you need to run the second half in 2:02 to break 4:00. That requires only an 18-second per mile fade, which is normal. If you run the first half in 1:55, you need 2:05 in the back half — a 28-second fade — which usually means walking.

Why Mile 20 is "The Wall"

"The wall" is glycogen depletion. Trained runners store about 1800-2000 calories of glycogen in muscles and liver. Marathon running burns about 100-110 calories per mile. 20 miles × 105 calories = 2100 calories. That is exactly when stored fuel runs out.

The fix is taking in carbs during the race. Gels, chews, sports drink — anything with 25g of carbs per serving. Start fueling at mile 4 (yes, that early), and take a gel every 30-40 minutes. By mile 20 you have replaced 200+ grams of carbs and the wall arrives later, lower, or not at all.

The other wall is mental. Around mile 22, every step hurts. There is no shortcut — you trained for this. Break the remaining distance into segments: "two miles to the bridge, then two miles to the park, then it is done."

Predicting Your Marathon From a Half

The Riegel-style multiplier for marathon from half is about 2.10, but reality is harsher: marathon time ≈ half marathon time × 2.10 + 5 to 15 minutes for most runners.

Quick examples:

• 1:30 half → 3:10 marathon (with strong long runs) to 3:18 (without)
• 1:45 half → 3:40 to 3:50 marathon
• 2:00 half → 4:12 to 4:25 marathon
• 2:15 half → 4:43 to 5:00 marathon

The "+5 to 15 minutes" buffer is the back-half fade. Runners who train at high mileage and execute fueling perfectly get the lower number. Runners who skip long runs or go out too fast get the higher number — or worse.

Frequently Asked Questions

Is 4 hours a good marathon time?

Yes — it is right around the median finish time for most major marathons. Sub-4 puts you in the upper half of finishers in most races.

What is the average marathon time?

About 4:20 to 4:35 for men and 4:45 to 5:00 for women across major marathons globally. Times vary by race because field composition differs.

Should I do a marathon as a first-timer?

Yes if you give yourself 16-20 weeks of dedicated training, including 4-5 long runs of 18+ miles. Aim to finish, not for a time goal. Time goals come in your second or third marathon.