What if my surgery is not scheduled yet?

Put in an approximate date and shift it later. The shape of the plan does not change; only the dates do. If you are still pre-surgery, the prehab page is the more useful one right now.

Are these dates typical or aggressive?

They are the usual ranges, with the running milestone at week 16 and the earliest defensible return-to-cutting-sport date at nine months. A meniscus repair, a cartilage procedure or a complication makes your real plan slower, and your surgeon's restrictions override every date here.

Does it store my surgery date?

No. The calculation happens in your browser and nothing is transmitted or saved. Reload the page and the field is empty again.

Why does it show week 104?

Because second injury risk is highest in the first two years, with 74% of graft ruptures in one series happening inside that window. A timeline that ends at return to sport ends before the risky part.

Updated August 17, 2026

Tool

ACL recovery timeline calculator

Enter your surgery date and get the actual calendar dates for every milestone, including the nine-month mark that most people never work out until it is behind them.

Your surgery date, turned into real dates

Ten milestones from day zero to year two, with the calendar date for each one and the 9-month mark called out. Runs in your browser, stores nothing.

Date of your ACL reconstruction

If surgery has not happened yet, put the scheduled date. The calculator handles a date in the future.

Why put dates on it at all

Because a plan expressed in weeks post-op is impossible to reason about against a real calendar. Week 36 means nothing. A date in the middle of next season means a lot, and it is the sort of thing worth knowing in month two rather than month seven.

Two things follow from seeing the real dates. Athletes with a season on the line find out early whether the nine-month mark lands before, during or after it. And everyone else stops treating month six as the end, because there is visibly a lot of calendar after it.

What the dates are and are not

Dates are arithmetic, not permission

Every milestone in this list is gated by criteria rather than by the calendar. Week 16 is when running usually becomes possible; it becomes possible when the knee is quiet, the extension is full and the quadriceps is strong enough, and if those are not there, the date is irrelevant. The 2017 clinical practice guideline recommends criterion-based progression precisely for this reason.

The nine-month mark, and why it is on the list

In the Delaware-Oslo cohort of 106 pivoting-sport athletes, the reinjury rate fell 51% for each month return to sport was delayed, up to 9 months, with no further reduction after that. In a Swedish registry study of 159 athletes aged 15 to 30, returning to knee-strenuous sport before 9 months was associated with a hazard ratio of 6.7 for a second ACL injury. Neither study says month nine is a switch. Both say the months before it are the expensive ones.

Then keep going

The last milestone in the list is year two, and it is there because that is where the risk sits. In one series of 316 patients, graft ruptures happened on average 1.8 years after surgery, with 47% in the first postoperative year and 74% within two years. The people who stop training the week they get cleared are training for the wrong finish line.