Oddly Measured

How many potatoes became my chips?

Chips and crisps are potatoes that have lost most of their water. Here is how many went in.

Real maths • Your answers stay on your device

What you'll need

  • Whether you mean hot chips or crisps
  • How long you have been eating them
  • How many servings in a normal week
  • Roughly how big one serving is
First things first — what do you mean by chips?

The two go through very different factories, so the maths differs.

The weight of what you actually eat, not the raw potato. Presets show their values.

Your number appears here.

Answer the questions and press Show me my weird number. Everything is worked out on your own device.

How we work this out

We count your servings, convert them to finished product weight, then work backwards through a published industrial processing yield to the raw potato that went in. Finally we divide by the FDA reference weight for one medium potato.

Step by step

  1. Work out lifetime servings: years × 52.1775 weeks × servings per week.
  2. Multiply by the finished weight of one serving.
  3. Multiply by the raw-to-finished factor for your chip type — 1.63 for hot chips, 1.50 for crisps.
  4. Divide by 148 g, the FDA reference weight for one medium raw potato.

What this does not claim

  • The processing yields are representative industrial figures measured at the processor gate. A home air fryer and a commercial fryer are not the same machine.
  • Hot chips and crisps have genuinely different yields, which is why the calculator asks first.
  • A reference medium potato is a labelling convention. Real potatoes vary a lot.

Sources

Every externally sourced value used by this calculator, with its full derivation and its limits.

about 1.63 g of raw potato per gram of chips

Raw potato required per gram of finished fries or hot chips at the processor gate.

The same published processed-potato model reports a finished fries yield of 61.35% of raw potato received at the processor gate.
raw / finished = 1 / 0.6135 ≈ 1.62999185

Limits: A representative industrial yield, not a universal restaurant or home-cooking ratio.

Status: verified · next review 2027-08-17

about 1.50 g of raw potato per gram of crisps

Raw potato required per gram of finished potato crisps at the processor gate.

Published processed-potato life-cycle model reports a finished potato-chip yield of 66.67% of raw potato received at the processor gate.
raw / finished = 1 / 0.6667 ≈ 1.4999250037

Limits: A representative industrial processing yield that includes finished-product oil and moisture effects. Individual products and processes differ.

Status: verified · next review 2027-08-17