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Why 'A Cup of Flour' Isn't a Fixed Weight

August 28, 2026 · DevTools

kitchen
cooking
unit-converter
recipes

"How many grams in a cup" is a question with no single right answer — a cup of flour, a cup of honey, and a cup of butter weigh completely different amounts, because volume-to-weight conversion depends on the ingredient's density, not just the unit. The Kitchen & Recipe Converter keeps a per-ingredient gram-per-cup table rather than pretending one ratio covers every ingredient.

Why the numbers vary so much

A cup of all-purpose flour is about 120g (it's aerated and full of tiny air pockets); a cup of honey is around 340g (dense, near-zero air, closer to its liquid density); a cup of granulated sugar sits at roughly 200g. Baking recipes that specify weight instead of volume exist for exactly this reason — cup measurements compress differently depending on how you scoop, but a kitchen scale removes that variance entirely. The tool's conversions match the commonly cited baking references, but if a recipe's success is critical, weighing beats any volume conversion.

Scaling by servings

Beyond straight unit conversion, entering a servings count and a target servings count scales every ingredient proportionally — halving a recipe or tripling it without redoing the arithmetic on every line by hand.

Gas mark, Celsius, and Fahrenheit

Oven temperatures get their own conversion, including UK gas marks (Gas Mark 4 = 185°C, Gas Mark 6 = 215°C, stepping 15°C per mark from a 140°C baseline) alongside the standard Celsius/Fahrenheit conversion — useful the moment a recipe from a different country's cookbook shows up.

For non-kitchen conversions

This tool's conversion table is specifically tuned for cooking ingredients and oven temperatures. For general length, weight, and volume conversion outside the kitchen, the Unit Converter covers the broader case; for sizing rather than weighing something, the Clothing & Shoe Size Chart handles the other kind of everyday conversion problem.

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