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Make a unit-price cheat sheet for your usual shop

Bigger packs aren't always cheaper. Get a quick way to compare unit prices for the things you buy every week.

Updated 17 Oct 2026

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The prompt · ChatGPT

Help me make a unit-price cheat sheet for my usual shop.

Staples I buy often: [e.g. rice, washing liquid, coffee, nappies]
Sizes I usually grab: [any]
Any deals that confuse me: [multibuy, clubcard]

Ask me up to 3 short questions first if anything important is missing. Wait for my answers.

Then:
1. How to read unit price on a UK shelf label in two sentences.
2. A cheat sheet for my staples: what unit to compare (per 100g, per wash, per nappy).
3. Three worked examples using blanks I can fill in-store.
4. When a multibuy is still a bad deal.

Only use what I've told you, leave blanks for anything I haven't given, and don't invent facts, figures or products. UK English.

Stay in this ChatGPT chat. Do not turn on apps or connectors, and do not use memory from another chat.

A short example

Fill the blanks, then paste. e.g. rice, washing liquid, coffee, nappies: a short note you already have. any: a short note you already have. Leave the rest of the prompt as written.

This does not give tax advice. The books stay in the accounting system.

The prompt · Grok

Help me make a unit-price cheat sheet for my usual shop.

Staples I buy often: [e.g. rice, washing liquid, coffee, nappies]
Sizes I usually grab: [any]
Any deals that confuse me: [multibuy, clubcard]

Ask me up to 3 short questions first if anything important is missing. Wait for my answers.

Then:
1. How to read unit price on a UK shelf label in two sentences.
2. A cheat sheet for my staples: what unit to compare (per 100g, per wash, per nappy).
3. Three worked examples using blanks I can fill in-store.
4. When a multibuy is still a bad deal.

Only use what I've told you, leave blanks for anything I haven't given, and don't invent facts, figures or products. UK English.

Stay in this Grok chat. Do not connect an inbox or another app.

A short example

Fill the blanks, then paste. e.g. rice, washing liquid, coffee, nappies: a short note you already have. any: a short note you already have. Leave the rest of the prompt as written.

1

You list the staples you buy often.

2

The assistant asks which sizes you usually grab.

3

You get a cheat sheet of what to look for on the shelf label and a few worked examples from your list.

What happens

Use Grok Bot to make a unit-price cheat sheet for your usual shop

Bigger packs aren't always cheaper. Get a quick way to compare unit prices for the things you buy every week.

Tools

Paste the prompt, fill the blanks, copy the draft.

  • Grok Bot — required. Drafts from the text you paste. Nothing is sent.

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