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Warranty Reserve per Unit Calculator

Reviewed for 2026, updated September 8, 2026.

Estimates how much a hardware brand should set aside per unit sold to cover future warranty claims, and what that reserve looks like as a share of revenue.

Your numbers

Results update as you type.

Your estimate

Expected claims from this year's units...
Total warranty reserve...
Reserve per unit sold...
Reserve as a share of revenue...

Estimates only. Assumptions are listed below, and you can change every input.

Every unit you ship carries a promise that costs money later. Most small hardware brands know their claim rate roughly and their repair cost roughly, but few translate those two numbers into a per-unit reserve they can defend to an accountant or an investor. Without that figure, warranty expense shows up as a surprise instead of a planned cost of doing business.

This calculator multiplies your expected claim rate by your average cost per claim, then spreads that expected cost across every unit sold. It is a straight expected-value estimate, not an actuarial model: it does not account for claim timing, failure curves or currency changes. Use it to get a defensible starting reserve, then adjust the inputs as your real claim data comes in.

How to use this tool

  1. Enter the units you plan to ship this year and the net price you receive per unit.
  2. Enter the share of units you expect to claim during the warranty term, using your own claim history where you have it.
  3. Break your average claim cost into parts, labor and shipping, then read the per-unit reserve and its share of revenue.

What the math assumes

  • Assumes the claim rate you enter covers the full warranty term for units sold in the year, not a single year of a multi-year warranty.
  • Assumes each claim costs the sum of the parts, labor and shipping figures you enter, with no salvage value recovered from returned units.
  • Assumes no supplier or component-maker recovery offsets the cost of claims.
  • Assumes one claim per failed unit; repeat claims on the same unit are not modeled.
  • Ignores taxes, currency movements and the time value of money.

Frequently asked questions

Where do I find my expected claim rate?

Start with your own claim history: claims received divided by units sold in the same cohort. If you are launching a new product, use the closest existing product line and revisit the number once the first few months of claims arrive.

Should the reserve count replacement units at cost or at retail?

Use your cost, not retail. A reserve covers what you actually spend to honor the warranty, and the retail value of a replacement is not money leaving your business.

Is this the same as the warranty accrual on my books?

It is a starting estimate for that accrual. Your accountant may adjust it for claim timing, product mix and historical experience, but the per-unit figure here gives you a defensible baseline to bring to that conversation.

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