How to use the running shoe rotation mileage split calculator
Rotating two or more pairs means your weekly mileage gets divided between them. Enter the weekly distance, then list each shoe on its own line with a name, a usage share, its current mileage and the limit you have chosen for it. The table then shows what each pair picks up per week and per month, how far it is from the limit, and how many whole weeks that leaves. The shoe that reaches its limit first is named separately.
The maths is proportional. Weekly mileage per shoe is the weekly distance times its usage share, and the monthly figure treats one month as 4.35 weeks. Weeks left divides the remaining distance by the weekly build-up and rounds down, so it is the number of complete weeks you can still run without passing the limit. If the shares do not total 100.0 percent the tool shows the current total and stops (checked October 2026).
No table of shoe lifespans in miles is included. Widely quoted ranges differ between sources and no authoritative standard is published, so each limit comes from the manufacturer figure or your own experience. Replacement verdicts and wear-out scores are not outputs either, and the tool does not model midsole stiffness change, body weight or running surface.
Frequently asked questions
The page does not supply one. Widely quoted ranges differ between sources and no authoritative standard is published, so you enter the manufacturer figure or your own experience for each shoe.
The calculation stops and shows the current total to one decimal. Weekly mileage is being divided between shoes, so the shares have to add up to 100 percent.
No. It works out the distance and the whole weeks left before each shoe reaches the limit you entered, and names which shoe gets there first.