How to Convert a Whole Recipe to Grams (and Why It Is Worth It)

Converting a cup recipe to weight once makes it reproducible forever. The method, line by line, and what to do when the result is not quite right.

A recipe in cups is a recipe you can approximate. A recipe in grams is a recipe you can reproduce. Converting the ones you make often is a half-hour job that pays back for years.

The method

For each ingredient: multiply the cup amount by that ingredient's grams-per-cup figure.

Take a standard cake:

The whole recipe now fits on one line of a scale display, and you can double or halve it without any fraction arithmetic at all.

What to convert, and what to leave

Convert:

Flour, sugar, and every other dry bulk ingredient — this is where the biggest errors live

Butter, oil and fats

The figures you will use most

For spoons rather than cups, divide by 16 for tablespoons and 48 for teaspoons. A tablespoon of flour is 125 ÷ 16 = 7.8 g.

When the converted version does not work

This happens, and there is usually one explanation.

The author scooped. If a recipe developer filled their measuring cup by dragging it through the flour bag, their "cup" held 140–150 g, not the 125 g standard. Your converted recipe is then 10–20% short on flour, and the result is wetter and flatter than theirs.

The fix: add 10–15% more flour and try again. Then write down what worked, because that is now your version of the recipe and it is more accurate than the original.

Liquids: grams or millilitres?

Water weighs almost exactly 1 g per ml, so 250 ml of water is 250 g and the two units are interchangeable.

Milk is slightly heavier at about 1.03 g/ml. Oil is lighter at about 0.92. Honey is much heavier at about 1.44.

In practice, most people find it easiest to weigh the dry ingredients and measure liquids in a jug. There is no purity requirement here — use whichever is less annoying.

Writing it down properly

Once converted, record it somewhere you will find it again.

Write the grams in the margin of the cookbook, next to the cup amount. You keep both, and you can see at a glance which you used.

Note the date and anything you changed. "Oct — used 340 g flour, better" is worth more in six months than any amount of memory.

The payoff

Consistency. The same bake every time, because the amounts are actually the same every time.

Speed. One bowl on a scale, tare between ingredients. No stack of cups to wash.

Easy scaling. Multiplying grams is instant. Multiplying "1⅔ cups" by 1.5 is a puzzle.

Frequently asked questions

How do I convert a recipe from cups to grams?

Multiply each ingredient's cup amount by its grams-per-cup figure. A cup of flour is 125 g, so 2½ cups is 313 g. The recipe scaler on this site will do a whole ingredient list at once.

Which ingredients should I not bother converting?

Anything counted rather than measured — eggs, tins, whole vegetables — and anything where a spoonful is already precise enough, like vanilla extract.

What if my converted recipe does not come out the same?

Most often the original author scooped their flour rather than spooning it, so their cup weighed more than the standard 125 g. Add 10–15% more flour and try again, then write down what worked.

Do I need to convert liquids too?

Water and milk convert almost exactly — 1 ml is about 1 g. It is often easier to keep liquids in millilitres and weigh only the dry ingredients.

Is it worth converting a recipe I only make once?

Probably not. It pays off on the recipes you return to, where the time you spend once saves you from measuring cups every time after.