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Warranty Expiry Date Calculator

Work out warranty expiry date instantly with clear inputs, formula shown and shareable results.

About Warranty Expiry Date Calculator

A 36 month warranty from 20 March 2026 expires on 20 March 2029. On 4 September 2026 that leaves 927 days of cover, with 15.4% of the period elapsed. Manufacturer warranty runs from purchase, while statutory consumer rights in many countries extend independently and for longer.

Formulas

Expiry date

expiry = purchase date with the month advanced by the warranty length

Cover remaining

days = expiry - today

Worked example

With the default values below, Warranty Expiry Date Calculator returns Days Of Cover Remaining of 928. Change any input above and every figure here is recalculated in your browser.

Inputs used

Purchase date
2026-03-20
Warranty lengthminimum 1 months
36 months
Today's date
2026-09-04

Results

Days Of Cover Remaining
928 days
Warranty Expiry Date
2029-03-20
Months Remaining
30.5
Warranty Period Elapsed
15.3%

Step by step

  1. 1Values used
  2. 2Expiry date
  3. 3Cover remaining
  4. 4Days Of Cover Remaining= 928 days
  5. 5Warranty Expiry Date= 2029-03-20
  6. 6Months Remaining= 30.5
  7. 7Warranty Period Elapsed= 15.3

Assumptions and limits

  • The result is derived only from the 3 inputs listed above. Anything not among them is not part of the calculation.
  • In particular, this calculator does not take inflation, tax, fees or charges or compounding frequency into account.
  • Figures are rounded for display to 1 decimal place, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.

How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.

Frequently Asked Questions

Does warranty run from purchase or delivery?

Usually from purchase or delivery, whichever the terms specify. For goods installed later, some warranties start at commissioning.

Are statutory rights the same as warranty?

No. Consumer law in the EU and UK gives rights against the seller for up to six years regardless of any manufacturer warranty.

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