PUBLISHED 3:53 PM EST | Nov 20, 2018

How Fast Would You Run A Marathon?

By Christie Aschwanden and Ella Koeze

Originally developed at Slate and now updated with an improved prediction formula

Predicted marathon time

00:00:0000:00:00

Target split: 00:00:00

No matter your age, sex, size or skill level, this calculator can estimate how fast you’d run 26.2 miles based on your training regimen and your performance in just one recent race (or two, if you want a more fine-tuned assessment). Have a marathon coming up? Your predicted time can help you pace yourself so you don't bonk. Read more »

Training regimen

How many miles are you typically running per week while training for your marathon?

100
miles

Race 1

Describe your longest recent race

1

Race distance

5K
5 miles
10K
10 miles
Half marathon

2

Race difficulty

Fast (cool, calm or flat)
Average
Hard (hilly, hot or windy)

Note: Races completed under extremely challenging or easy conditions are not very good for predicting marathon times.

3

What was your time?

10
hrs
59
min
59
sec

Race 2 (optional)

Describe another recent race that was a different length than Race 1

1

Race distance

5K
5 miles
10K
10 miles
Half marathon

2

Race difficulty

Fast (cool, calm or flat)
Average
Hard (hilly, hot or windy)

Note: Races completed under extremely challenging or easy conditions are not very good for predicting marathon times.

3

What was your time?

10
hrs
59
min
59
sec

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