What this result means
800m repeats are a classic VO2 session. This calculator uses a pace you choose, a rep count, and rest. It does not pull 800 times from a marathon clock.
The 800m pace calculator is one two-lap time trial. This page is the set with rest.
5 × 800 at 3:45/km with 2:30 rest: each 3:00, work 15:00, rest 10:00, session 25:00, work 4.0 km.
Yasso for a 3:10 marathon would target 3:10 800s regardless of the pace field on this page. Different tools.
6 × 800 at 4:00/km with 2:00 rest is 3:12 per rep and 4.8 km of work. Enter the 800 time from Yasso here if you want the session total.
Calculation method
Work time = 0.8 × seconds per km. Totals as for any interval session: rest × (reps − 1).
Exact arithmetic.
Track 800s on a hot day need more rest than the number you typed if you typed a winter rest. The tool will not argue.
Frequently asked questions
Is this Yasso 800s?
No. Yasso maps marathon H:MM to 800 MM:SS. This page uses a pace you enter.
How much rest should I take?
Coaching call. 1:1 to 2:00 is common. The work/recovery tool converts a ratio into seconds.
What is 6 × 800 at 4:00/km?
3:12 each, 3.2 km of work, plus whatever rest you enter between.
Should I use the 800m pace calculator instead?
Use that page for one 800 m goal time and even 200 m splits. Use this page when the workout is several 800s with rest. Use Yasso 800s only when the 800 time comes from a marathon H:MM mapping.