HIV Test Date & PEP Time Calculator
Enter the date of your risk (e.g. unprotected sex) and see when to test — and whether you are still in time for emergency prevention (PEP).
Add the approximate time too, so the PEP window (72 hours) is calculated accurately.
When to test for HIV
Testing too early during the “window period” can give a false negative. The dates below are when each method can start detecting infection.
Ready to test?
Find a clinic near you or book a test online.
This tool provides general educational information only and is not a medical diagnosis. Timing can vary by person and test type. If you had a high-risk exposure or have unusual symptoms, please consult a doctor or clinic directly.