Baking Conversions 101: A Practical Starting Point
Baking conversions look complicated at first because there are several unit systems in play at once. Most confusion comes from mixing these up rather than the math itself.
By GramsToCups Editorial Team · January 29, 2026
Two Categories of Measurement
The starting point is understanding that volume and weight are different kinds of measurement. Cups, tablespoons, and teaspoons all measure volume — how much space an ingredient takes up. Grams, ounces, and pounds measure weight — how heavy it is.
US volume (cups, tablespoons), US weight (ounces, pounds), and metric weight (grams, kilograms) can all appear in the same recipe, which is where most conversion confusion starts.
When You Need a Density Value
For a fixed volume, weight changes based on the ingredient. This is why there's no single 'cups to grams' formula that works for everything. Each ingredient needs its own density value, typically expressed as grams per cup — every ingredient page on this site lists its exact figure.
When You Just Need a Fixed Multiplier
Volume-to-volume and weight-to-weight conversions, on the other hand, are always fixed. A cup is always 16 tablespoons. A pound is always 453.6 grams. These conversions don't depend on what you're measuring.
| Conversion Type | Example |
|---|---|
| Volume to volume | Cups to tablespoons — always ×16 |
| Weight to weight | Grams to ounces — always ÷28.35 |
| Volume to weight | Cups to grams — needs density |
The One Practical Rule to Remember
Rule of thumb
If you're converting between two volume units or two weight units, the math is simple multiplication or division by a fixed number. If you're converting between a volume unit and a weight unit, you need the ingredient's density.
Worth Memorizing
Common density values are worth memorizing for ingredients you bake with often.
- All-purpose flour: roughly 125g per cup
- Granulated sugar: roughly 200g per cup
- Butter: 227g per cup (standardized by US stick packaging)
When in doubt, a kitchen scale and the how many grams in a cup reference cover almost every conversion question that comes up in a home kitchen.