Understanding Baker’s Math & Baker’s Percentages in Sourdough Bread Baking

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Confused about baker’s math and baker’s percentages in the sourdough baking process? Sometimes you’ll see a recipe expressed as a percentage – it can be a little confusing, but once you understand the basics, you’ll be able to follow these recipes with ease.

Baker’s Math / Baking Percentages in Sourdough Baking

Baker’s Math is a way of expressing a recipe so that it can be easily scaled up or down. Have you ever looked at a recipe and wondered what it would look like with an extra 100g of flour? Baker’s Math is an easy way to do these calculations – without losing your mind!

In Baker’s Math, you always use flour as 100% and then any other ingredients are a percentage of that. This can make it confusing since the other ingredients can add up to more (or less) than 100%. But once you get your head around it, it can be really handy!

For example, my basic sourdough recipe, expressed as percentages would be –

Flour – 100%
Water – 70%
Starter – 10%
Salt – 2%

The calculation is as follows:

Water (350g) divided by Flour (500g) x 100 = 70%

You always divide the ingredient by the weight of the flour and then times by 100.

Easy, right? Really the only confusing part is that the ingredients (other than flour) will not add up to 100%. They are percentages in relation to the flour.

Scaling A Recipe Using Baker’s Percentages

Expressing a recipe in percentages means that you can use any weight of flour and scale the recipe up or down. So my recipe is:

Flour – 500g (100%)
Water – 350g
Starter – 50g
Salt – 10g

But if you look at the percentages, you can use say 400g of flour instead of 500g and then just use the percentage to convert the other ingredients. This is handy if you want to bake a smaller loaf:

Flour (100%) 400g
Water (70%) 280g (400g flour x 0.7 = 280g)
Starter (10%) 40g (400g flour x 0.1 = 40g)
Salt (2%) 8g (400g flour x 0.02 = 8g)

And you thought you’d never use math in real life applications lol.

Looking for an explanation into sourdough hydration and why some recipes use more water than others? Go here.

Use A Scale

If you really don’t want to have to deal with Baker’s Math – you can buy a set of scales that will do it for you! Now, you know scales are a must have when it comes to sourdough, but these clever digital scales take it to the next level with their handy calculations.

Want more products that will make your sourdough baking easier? You’ll find my top picks here.

Sourdough Made Easy Ebook

Join our supportive community of sourdough bakers on Facebook here.

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1 Comment

  1. Terese January 6, 2021 at 7:50 am

    Thank you very much for explaining in such an easy way! I’ve never fully understood how to actually use baker’s math /percentages before, so this was very helpful.


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