Yasso 800s Calculator
Yasso 800s is a training rule of thumb many runners know. Take the hours and minutes of a marathon goal, and use them as the minutes and seconds of each 800 meter repeat. This calculator does that conversion.
- Free
- Works offline after your first visit
- Saves on this device
- No sign-up
- Updated
How it works
Take the goal in hours and minutes, such as 3 hours 30 minutes. Read those figures as minutes and seconds, so 3 hours 30 minutes becomes 3 minutes 30 seconds for each repeat.
It is a rule of thumb, not a prediction. Use it as a starting point for repeats, and adjust by how the sessions feel and how hard they are.
Worked example
A marathon goal of 3.5 h points to 800 meter repeats near 3 min 30 s each.
Questions
Does the rule work for every runner?
No. It suits many runners training for a marathon, but it may not match your own times, so use it as a guide.
How many repeats should I run?
That depends on your training plan. A coach or a plan that fits your experience is the right place to decide.
Is the goal the same as my race pace?
No. It is your target marathon time. The repeats are run faster than race pace, in training, not in the race.
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