Pan Size Converter

Work out how a recipe scales between two tin sizes by area or volume, with a suggested bake time change.

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Input
Output
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About pan size converter

Pan Size Converter needs nothing from a server once the page has loaded. Leave it open on a train with no signal and it carries on.

Because the work happens here, pasting production data carries no more risk than opening the file locally. Nothing is logged, since nothing arrives to log.

You will find it under Kitchen, alongside 13 other tools for the same sort of job.

Runs in this tab, so nothing you type is uploaded.

How to use it

01
Start it
Every control is on the tool itself. Keyboard shortcuts, where there are any, are listed beside it.
02
Watch it run
It updates in the page as you go. Nothing is sent anywhere, so it keeps working with the network off.
03
Close when done
Nothing is stored between visits. Reloading gives you a clean start rather than picking up where you left off.

Examples

20cm round tin to a 23cm round tin
Comparing by base area, with a 35 minute original bake time
Input
fromShape: round
fromDimension1Cm: 20
toShape: round
toDimension1Cm: 23
basis: area
originalBakeMinutes: 35
Output
From area cm2: 314.2
To area cm2: 415.5
From volume cm3: 0
To volume cm3: 0
Basis used: area
Scale factor: 1.32
Quantity multiplier percent: 132
Suggested bake minutes: 46
Note: Multiply every ingredient quantity by the scale factor. Treat the suggested bake time as a starting point: check a little before it is up, since oven behaviour does not scale exactly with pan size.

Questions

Does Pan Size Converter work offline?+

Yes. It is JavaScript running in this tab, so once the page has loaded it needs nothing further from the network. Put the machine in flight mode and it carries on. Nothing you do here is sent anywhere, because there is nowhere for it to go.

Does it remember anything between visits?+

No. Reload the page and it starts from nothing. There is no account, no saved state and no cookie holding your last session. That is a deliberate trade: it cannot lose your data because it never keeps any.

Is it accurate?+

Timing comes from performance.now(), the high resolution clock the browser provides, rather than from setInterval, which drifts by a few milliseconds every tick and compounds over minutes. What can still shift things is the browser throttling a tab in the background, so leave it visible if the timing matters.

Does it make a sound?+

Where a sound makes sense, it is generated with the Web Audio API rather than loaded as a file, so there is nothing to download and nothing to block. Browsers refuse to start audio until you have interacted with the page, which is why the first press is what switches it on.

Can I use Pan Size Converter on a phone?+

Yes. The controls are sized for touch and the layout collapses to one column on a narrow screen. Bear in mind that a phone locking its screen will suspend the page, and timing stops with it.