UAV & Drone Manufacturing worked example

Warranty Return Cost at 4.32% warranty return rate: a worked example

This worked example runs the warranty return cost numbers for a tougher week than the baseline: 4.32% warranty return rate instead of the typical 6%. Estimates the cost of handling warranty returns across a shipped drone production run.

The inputs for this scenario

  • Drones sold under active warranty: 800 units (held at the documented default)
  • Cost to process each RMA return: 210 $/return (held at the documented default)
  • Warranty return (RMA) rate: 4.32 % (the input this scenario stresses; the baseline uses 6)
  • Fixed returns program overhead: 3,000 $ (held at the documented default)

Working through the calculation

  • The calculation starts from the formula this tool documents: Total cost = units sold x processing cost per return x warranty return rate + returns program overhead.
  • Total warranty return cost works out to 10,258 $ at these inputs, and this is the headline figure for the scenario.
  • Warranty return cost per unit works out to 12.82 $ / piece at these inputs.
  • Variable warranty return cost works out to 7,258 $ at these inputs.
  • Fixed warranty return cost adder works out to 3,000 $ at these inputs.

How this compares with the baseline

  • Against the tool's baseline example, where warranty return rate sits at 6% and the headline result is 13,080 $, this scenario comes in 21.58% below the baseline at 10,258 $.
  • Use it when setting a warranty reserve per airframe, quoting an enterprise fleet deal, or building the business case to fix a recurring field failure. A result at this level usually justifies acting on the stressed input before touching anything else, because every other figure in the table is downstream of it.

Results at a glance

  • Total warranty return cost: 10,258 $ (headline result)
  • Warranty return cost per unit: 12.82 $ / piece
  • Variable warranty return cost: 7,258 $
  • Fixed warranty return cost adder: 3,000 $

Run it with your numbers

  • To rerun this with your own numbers, open the live Warranty Return Cost calculator, set warranty return rate to your actual value, and adjust the remaining inputs to match your operation.

Last reviewed 2026-05-12.