Can a 5K predict my mile time?

It gives a reasonable estimate, usually a touch conservative. The mile depends on leg speed and lactate tolerance that a 5K does not fully test, so trained milers often beat the prediction.

Why might my real mile be faster than predicted?

Because the mile rewards top-end speed. If you do strides or interval work, you can change gears in a way the formula does not assume from a steady 5K, and your mile drops below the predicted time.

Is predicting down to a shorter race less accurate?

Slightly. The further a race sits from your input in either direction, the more the prediction assumes. Down to the mile it assumes a balance of speed and endurance that not every runner has.

Predict Your 1 mile Time From a 5K

Ran a 5K lately? Enter your time to see what it predicts for the 1 mile, plus the pace you would need to hold.

Your 5K time

min

sec

Pace in

Predicted 1 mile time

6:37

That is 6:37 per mi.

Worked example

A 5K of 22:00 predicts a 1 mile of about 6:37, a pace of 6:37 per mi. Change the time above to run the same math on your own result.

How a 5K predicts your 1 mile

Most predictions scale a short race up to a longer one. This one runs the other way, taking your 5K down to a single mile, and that changes the character of the estimate. The mile is far more anaerobic than a 5K, leaning on leg speed, running economy, and your tolerance for lactate, none of which a steady 5K fully reveals.

For a pure distance runner the predicted mile is usually a fair, slightly conservative target, because they have the aerobic strength but may lack top-end speed. For someone with natural turnover, the real mile can be quite a bit faster than the formula suggests. Either way, treat this as a starting estimate and let a few fast reps tell you the rest.

Why a faster mile takes more than fitness

Riegel assumes your training is balanced across the distances, but the mile asks for something a 5K does not, the ability to run uncomfortably fast and hold form while it hurts. If you never do strides, intervals, or any work faster than 5K pace, your mile will sit close to the prediction or even behind it, because your body has no practice changing gears.

Add a weekly dose of short, fast running, even just six to eight strides after an easy run, and your mile will start to outrun the formula. The aerobic base you built for the 5K is already there. The mile is mostly about teaching your legs to use it quickly.

Want every distance at once? The race pace predictor shows your time for the whole range and prints a pace band, and the VDOT calculator turns this race into your training paces.

Related predictions

5K to 1 mile questions

Can a 5K predict my mile time?: It gives a reasonable estimate, usually a touch conservative. The mile depends on leg speed and lactate tolerance that a 5K does not fully test, so trained milers often beat the prediction.
Why might my real mile be faster than predicted?: Because the mile rewards top-end speed. If you do strides or interval work, you can change gears in a way the formula does not assume from a steady 5K, and your mile drops below the predicted time.
Is predicting down to a shorter race less accurate?: Slightly. The further a race sits from your input in either direction, the more the prediction assumes. Down to the mile it assumes a balance of speed and endurance that not every runner has.