Crumb — Baker's Math

Sourdough & bread calculator

Only for iPhone

Free · In‑App Purchases · Designed for iPhone. Not verified for macOS.

iPhone

Type grams or percentages and get the rest: total hydration with levain and add-ins, batch scaling, and the water temperature for your target dough temp. Baker's percentages, total hydration and water temperature, worked out as you type. Crumb is a formula calculator for sourdough and home bakers. Enter a formula in grams or in percentages, and the other column updates as you go. ■ Features • Baker's percentages and grams, editable in either direction • Total hydration that counts the water in your levain and in wet add-ins such as egg, milk, butter and honey • Prefermented flour percentage, pinned at the top of the formula • Scale a batch by number of pieces and piece weight, or by total dough weight, with an optional loss percentage • A measuring sheet in grams, ounces or pounds • Water temperature for your desired dough temperature (DDT), with hand and mixer friction presets • Celsius or Fahrenheit ■ Free The whole calculator and 3 saved formulas. A banner ad appears on the formula list only. The formula editor and the water temperature screen have no ads. ■ Crumb Pro (one-time purchase) • Unlimited saved formulas, plus Duplicate • Share the measuring sheet as an image • No ads Pro is a single purchase, not a subscription. You can restore it on other devices signed in with the same Apple Account. ■ Just the math Crumb calculates and nothing else: no timers, no reminders, no account. Your formulas stay on your device.

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The developer, Sangwon Kim, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .

  • Data Used to Track You

    The following data may be used to track you across apps and websites owned by other companies:

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    The following data may be collected and linked to your identity:

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Privacy practices may vary, for example, based on the features you use or your age. Learn More

Accessibility

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Information

Seller
Sangwon Kim
Size
26.9 MB
Category
Food & Drink
Compatibility
Requires iOS 13.0 or later.
  • iPhone
    Requires iOS 13.0 or later.
  • iPod touch
    Requires iOS 13.0 or later.
  • Mac
    Requires macOS 11.0 or later and a Mac with Apple M1 chip or later.
  • Apple Vision
    Requires visionOS 1.0 or later.
Languages
English and Korean
Age Rating
4+
In-App Purchases
Yes
Copyright
© 2026 Sangwon Kim
  • Privacy Policy

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