800m Time Predictor

The 800m sits between sprinting and distance running, which is why 400m runners and milers both race it. Enter a recent 400m, 1500m or mile time to see what 800m your current fitness supports.

Quick answer: a 57.00 s 400m converts to about 2:11 for the 800m (typical range 2:05 to 2:20).

How it works

From a 400m the model adds the endurance part an 800m needs; from a 1500m or mile it works down using your aerobic fitness. Because the 800m draws on both systems, combining a 400m and a 1500m time gives the most precise estimate: it shows whether you are a speed-type or an endurance-type 800m runner.

Training advice

Train both systems: aerobic running and threshold work for the base, and race-pace reps such as 4–6 × 200m or 3 × 300m at 800m pace for specific fitness. Even pacing wins; a first lap only 1–3 seconds faster than the second is typical for good 800m races.

Frequently asked questions

How do I predict my 800m from a 400m?

Enter your 400m time above. For a typical club runner the 800m comes out at about twice the 400m plus 15–18 s (a 57 s 400m gives about 2:11). Trained 800m runners with a strong aerobic base close that gap a lot, which is why a second time from 1500m or mile helps.

What is a good 800m time?

Fast high school boys run under about 2:00 and fast high school girls under about 2:20. The world records are 1:40.91 (David Rudisha) and 1:53.28 (Jarmila Kratochvílová).