Yasso 800 Calculator

It converts your marathon goal time's hours and minutes directly into minutes and seconds for your 800m rep pace. For example, a 3:30 goal means you run 800m in 3 minutes 30 seconds, and recover jog for the same 3:30.

Yasso 800s is a workout devised by coach Bart Yasso, based on the rule of thumb that your 800m rep time in minutes:seconds roughly matches your marathon finish time in hours:minutes. That's why the goal marathon time converts directly into an 800m rep pace.

The recovery jog lasts the same amount of time as your 800m rep target. If you ran the 800m in 3:30, jog easily for another 3:30 to recover before starting the next rep.

The full Yasso 800 workout is 10 reps, but if it's your first time, it's safer to stop at 6 and build up to 8, then 10 as you adapt. If a rep falls more than 3 seconds off pace twice, cut the remaining reps for that day.

No. The table only covers the main set (reps and recovery jogs). It's recommended to warm up with at least 1.6km of easy jogging plus light drills, and cool down with at least 1.6km of easy jogging after the last rep.

It adds only 0.8km per 800m rep. Recovery jog distance varies from runner to runner, so it isn't counted, and warmup and cooldown distance aren't included either, so your actual total running distance will be more than the table shows.

No. All calculations happen entirely in your browser and are never sent to or stored on a server.