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Scaling recipes without ruining them

Doubling a recipe is not multiplying every number by two. Leavening, salt, spices, pan size and baking time all behave differently, and the ones that misbehave are the ones that ruin the result. This is which is which.

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Pages
33
Format
PDF, sized for a phone
Read time
About 20 min
Updated
August 2026

What you get

What multiplies, what does not, and why

33 pages. PDF, sized for a phone. No fluff chapters, no padded intro, no upsell at the end.

  • What scales linearly and what does not. Flour and sugar behave. Leavening, salt, spices and baking time do not, and the guide says how each one misbehaves.

  • Pan geometry worked from area, with the formula shown so you can substitute a pan that is not in the table.

  • Time and temperature. Why a doubled recipe is not double the time, what actually changes, and how to tell doneness when the clock stops being useful.

  • Where to hold a ratio constant instead of scaling it, and how to adjust by feel once the arithmetic runs out.

  • A measure-it-yourself procedure for tall pans, because published capacity figures for those are unreliable.

A free page from inside

A square pan matches a round pan one inch larger

This is one of the 33 pages, in full. If it is useful on its own, the rest will be too.

Sample · Chapter 9

Pan geometry, worked from area

Scaling batter without scaling the pan is how a cake ends up raw in the middle. What matters is area, not the number on the label. An eight inch square pan is 64 square inches. A nine inch round pan is 63.6. Those two are interchangeable, and almost nobody realises it because the labels look nothing alike.

Every pan figure in the guide is computed from its stated dimensions with the formula shown, so you can check the arithmetic and apply it to a pan that is not listed. For tall pans, where area alone misleads, there is a measure-it-with-water procedure instead of a borrowed number.

Scaling recipes without ruining them

Why trust this

Where it comes from

  • Every pan figure is computed from stated dimensions with the arithmetic shown, so nothing rests on a number you cannot check.
  • Where something is craft judgement rather than measurement, the guide says so instead of dressing it as research.

Written by Michael Ip

I build the converter this site runs on. The densities in this guide are the ones I would use myself.

The offer

$19, once. Then it is yours.

No subscription, no account, no email sequence waiting for you.

  1. Pay $19Card or Apple Pay, handled by Creem. Takes about twenty seconds on a phone.

  2. Download immediatelyThe PDF link appears on the confirmation screen. No waiting on an email to arrive.

  3. Keep itIt is a plain PDF on your device. It works offline, prints fine, and nothing can revoke it.

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30-day refund 33 pages, PDF, sized for a phone

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Questions

Before you buy

What exactly do I get, and how?
A PDF, in A4 and US Letter. The download link appears on the confirmation screen the moment payment clears. You do not wait for an email, and you do not need one to arrive.
Do I need an account?
No. There is no account, no login and no password. You pay, the file downloads, and that is the whole relationship unless you choose to email me.
What is the refund policy?
Thirty days, no questions asked. Email [email protected] and say refund. No form, no reason required, no attempt to talk you out of it. You keep the PDF.
Will it open on my phone?
Yes. It is a standard PDF, so it opens in Files on iPhone, in Drive or any reader on Android, and in every desktop browser. It prints cleanly if you prefer paper.
Is this just the free converter in a PDF?
No. The figures come from a published weight chart and are cited in the guide, and where that chart disagrees with physics the guide shows both numbers and explains the difference.
Who is this not for?
If you want tactics that promise growth, skip it. This is a ledger. It is useful if you are deciding whether to build a portfolio like mine, and most useful if it talks you out of it.