Expiry Date Calculator

Turn any printed expiry format into a clear ‘safe until’ date, including opened-pack rules.

Table of contents7 sections

What this tool does

The Expiry Date Calculator converts any printed medicine expiry format (MM/YYYY, MON-YY, YYYY-MM, DD.MM.YYYY or GS1 YYMMDD) into an exact 'safe until' date and days remaining, and applies after-opening limits for eye drops, insulin, syrups, reconstituted antibiotics and creams.

Expiry printed on pack

Has it been opened?

Opened-pack periods are typical values. Always follow your pack leaflet.

Enter the expiry to see your result.

How to use it

1
Type the printed expiry
Copy it exactly as shown after 'Exp'.
2
Say if it's opened
Choose the product type and the date you opened it.
3
Read the result
You'll see the safe-until date and which rule limits it.

How month-only dates work

'Exp 06/2027' means the medicine may be used until the last day of June 2027. A GS1 code with day '00' also means end of month.

Opened-pack rules

Once opened, many products expire sooner than the printed date: typically 28 days for eye drops and in-use insulin, and 7 days for mixed antibiotic suspensions. Always follow your pack leaflet.