Our Conversion Methodology
How we turn grams into cups — and why the ingredient matters.
Latest recorded source check: 2026-10-26
The core formula
Grams to cups
cups = grams ÷ grams per cup
Example: 100g all-purpose flour ÷ 120g per cup = 0.83 cups
Cups to grams
grams = cups × grams per cup
Example: 1 cup all-purpose flour × 120g per cup = 120 grams
Why ingredient density matters
A cup measures volume — how much space an ingredient takes up. Grams measure weight. Those two things line up differently for every ingredient, because density (how tightly packed the ingredient is) differs by ingredient. Flour is light and airy; sugar is granular and settles more densely; butter is a solid fat packed into the cup. That's why a single "1 cup = X grams" rule breaks down the moment you switch ingredients — and why every ingredient on this site has its own grams-per-cup value.
Same cup, different weight
1 cup all-purpose flour
= 120g
1 cup granulated sugar
= 198g
1 cup butter
= 227g
All measured using US cup / 240 ml
How we source grams-per-cup values
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Start from reviewed baking references
Initial grams-per-cup values come from reviewed baking references and kitchen measurement guides, not guesswork.
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Check against standard kitchen conventions
We match values to common measuring practice — spoon-and-level or packed, depending on the ingredient.
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Automated checks on every value
An automated check makes sure every value is in a plausible range, matches the source it was adopted from and gives a valid weight for every cup type, and that no ingredient is listed twice.
When a reference says “1 cup” without declaring an exact milliliter volume, we preserve the published value and adopt it as an approximate 240 ml recipe reference; we do not describe it as volume-normalized. Formula-based normalization is allowed only when the source volume is explicit.
The 236.588 ml and 250 ml columns are proportional projections from the same canonical reference, rounded consistently to one decimal place, and cannot be edited independently.
Cup standards we use
This calculator uses US cup / 240 ml by default, but you can switch cup types whenever your recipe calls for a different standard. 1 tablespoon = 15 ml; 1 teaspoon = 5 ml. Spoons do not change with the cup type.
240 ml
US cup
236.6 ml
US customary cup
250 ml
Metric cup
Rounding & approximation
Volume conversions are approximate recipe references. Cup results normally show two decimals; very small positive results use scientific notation instead of zero. Weight ounces use exactly 28.349523125 grams per ounce, rounded only for display. Kitchen estimates use the selected cup volume and fixed 15 ml tablespoons / 5 ml teaspoons. They choose the closest cup fraction with spoon remainders rounded to ½ teaspoon (¼ teaspoon for small amounts). The estimate stays within 10% of the calculated volume; smaller quantities use decimal teaspoons or “less than ¼ teaspoon”. This rounding bound excludes ingredient density uncertainty. Decimal results remain available.
Approximate by design: if a recipe depends on precise ratios (bread hydration, macarons, laminated dough), weigh ingredients with a kitchen scale rather than relying on cup measurements alone.
How we keep data current
Every ingredient entry carries a "last checked" date and a confidence rating. A value changes only when its cited source supports the change. Source checks are dated per source. The ingredient review date and dataset version date are separate records; the latest source check is not a review of every ingredient or of this page.
Latest recorded source check: 2026-10-26