1/2 Cup in Grams: Butter, Flour, Sugar Conversion Guide

Anyone who’s baked more than a few recipes knows the frustration of looking at a half-cup measurement and wondering exactly how many grams that actually is. The short answer: it depends on what you’re measuring. This guide breaks down the exact gram weights for flour, sugar, butter, water, and more, so you can bake with confidence — no more guessing.

1/2 cup all-purpose flour: 60–65 grams ·
1/2 cup granulated sugar: 100 grams ·
1/2 cup butter (1 stick): 113 grams ·
1/2 cup water: 120 grams ·
1/2 cup whole milk: 122 grams

The snapshot above shows the key conversions at a glance.

Four ingredients, one pattern: the weight of half a cup varies by more than a factor of three — from 55 g for cake flour to 170 g for honey. Always check the ingredient before relying on a generic conversion.

What’s 1/2 cup in grams?

1/2 cup butter in grams

• 1/2 cup butter = 113 grams = 1 stick (OvenMath baking conversion chart)
• Sally’s Baking Addiction PDF lists 1/2 cup butter as 115 g, a rounding difference (Sally’s Baking Addiction official weight chart)
• Cafe Fernando conversion table shows 1 stick = 115 g (Cafe Fernando cooking conversion table)

The implication: most US baking sources agree on 113 g per stick, but a few round up to 115 g. The difference (2 g) is negligible for most recipes, but if precision matters, follow your recipe’s source.

1/2 cup sugar in grams

• Granulated sugar: 1/2 cup = 100 g (OvenMath; CoolConversion baking chart)
• Brown sugar (packed): 1/2 cup = 110 g (OvenMath)
• Powdered sugar: 1/2 cup = 60 g (OvenMath)

The catch: sugar is the most consistent ingredient — 100 g for granulated holds across nearly every source. Brown and powdered sugars vary because of packing and air content.

1/2 cup water in grams

• Water: 1/2 cup = 120 g (based on 240 ml per cup at Weekend Bakery conversion tools)
• Whole milk: 1/2 cup = 122 g (slightly denser)
• Honey: 1/2 cup ≈ 170 g (varies by brand)

Why this matters: water is the reference point — 1 ml = 1 g. Milk and honey are denser, so half a cup weighs more. For liquids, a kitchen scale is still more accurate than a liquid measuring cup for sticky ingredients like honey.

Is 100g a half a cup?

Is 50g 1/2 cup?

• 50 g is not a standard half cup for most ingredients
• For all-purpose flour, 50 g is roughly 1/3 cup (Baking Like a Chef conversion guide)
• For granulated sugar, 50 g is about 1/4 cup

The pattern: only powdered sugar (60 g per 1/2 cup) comes close to 50 g. Most other ingredients are heavier.

Is 250g the same as 1/2 cup?

• No — 250 g is about 2 cups of all-purpose flour (Thrice baking guide)
• 250 g of granulated sugar is 1.25 cups
• 250 g of butter is slightly more than 2 sticks (about 1 cup + 1 tbsp)

The implication: if a recipe says “250 g flour”, do not substitute 1/2 cup — you’ll end up with far less flour. Always use the gram weight specified.

Is 250g 1 cup of flour?

Is 1 cup of flour 100 grams?

• No — 1 cup of all-purpose flour is generally 125 g (spooned & leveled) (CoolConversion data; Thrice)
• Some sources list 120 g per cup (Baking Like a Chef)

The catch: the “100 g per cup” myth likely comes from recipes using sifted flour or metric cup conventions (250 ml vs 240 ml).

Is 1 cup of flour 500g?

• No — 500 g is approximately 4 cups of all-purpose flour (Cafe Fernando conversion tables)
• Confusion arises when recipes use “cup” for different volume standards

The trade-off: using 500 g when a recipe calls for 1 cup would multiply the amount by 4x. Always check whether your source uses US customary cups or metric cups.

How to measure 250g of flour without a scale?

1. Use the spoon-and-level method: Spoon flour into a dry measuring cup, then level off with a knife. This avoids packing.
2. Convert cup measurement: Since 1 cup (spooned & leveled) = ~125 g, 250 g equals 2 cups.
3. Use a household alternative: A standard coffee mug holds about 1.5 cups; fill it until it reaches the 2-cup volume mark for ~250 g.

What this means: without a scale, you can get close — but expect 10–15% variation. For sensitive recipes (like macarons or chiffon cake), a scale is non-negotiable.

How do I convert grams of flour to cups?

Conversion chart for flour grams to cups

• General formula: grams ÷ density (g per cup) = cups
• All-purpose flour density: ~125 g per cup
• Whole wheat flour: ~130 g per cup
• Bread flour: ~127 g per cup (Scale Recipe converter)

Common conversions

• 50 g flour = 0.4 cups (about ⅓ cup)
• 100 g flour = 0.8 cups (about ¾ cup + 2 tbsp)
• 250 g flour = 2 cups
• 500 g flour = 4 cups

The pattern: once you know the density of your specific flour, converting grams to cups is straightforward. But note that different flour brands and types have slightly different densities.

The takeaway: stick to one trusted source for your conversions to avoid variability.

Spec table: 1/2 cup weights for common baking ingredients

Seven ingredients, one pattern: density dictates weight. The table below summarises half-cup weights for the most common baking pantry items.

The implication: if you know the density, you can calculate any volume-to-weight conversion. For everyday baking, memorise the top three (flour, sugar, butter) and you’ll be covered for most recipes.

Clarity section

These clarifications help you decide when to trust a specific conversion and when to adjust.

Quotes from expert sources

“For all-purpose flour, 1 cup weighs 125 grams.”

— Allrecipes.com conversion chart, a trusted resource for home bakers

“A US cup is 240 millilitres. Use this as the basis for converting cups to grams for all dry ingredients.”

— Doves Farm conversion table, a UK flour mill known for precise baking guides

“If you need to convert any ingredient from cups to grams, you can use our interactive converter. But remember: generic converters don’t account for packing or sifting.”

— The Calculator Site kitchen conversion tool, a popular reference for home cooks

These expert voices reinforce the core message: consistency and source reliability matter.

Summary

For anyone who bakes regularly, the difference between 60 g and 70 g of flour is the difference between a tender biscuit and a dense rock. The half-cup measurement is a trick of volume, not mass. The only reliable solution is a digital scale — under $20 and accurate to 1 g. For home bakers, the choice is clear: weigh your ingredients, or accept inconsistent results. For recipe developers, the responsibility is even greater: always provide gram weights alongside cups to remove the guesswork entirely.

Related reading: Self Raising Flour Recipe: Ratio & Grams Guide

Frequently asked questions