The Short Answer
In everyday terms: 1 level teaspoon of baking powder weighs about 4–4.8 grams, and 1 tablespoon weighs roughly 14–22 grams depending on the brand's exact formulation. Since baking powder is a blend of a few different powdered ingredients (more on that below), its density isn't quite as fixed as a single-substance ingredient like sugar or salt.
Grams To Cups Converter
Convert grams to cups instantly for common cooking and baking ingredients.
Why This Ingredient Doesn't Have One Locked-In Number
Baking powder isn't one pure substance — it's a manufactured mix of an alkaline component (usually baking soda), one or more powdered acids, and a starch filler (often cornstarch) that keeps the mixture stable and dry until it meets liquid. Because different brands use slightly different ratios of these three components, and different particle sizes for each, the overall density can shift by brand more than it would for something like table salt or flour. This is also why baking powder containers are almost always labeled by teaspoon dosage in recipes rather than by weight — teaspoon measurement has stayed the practical standard specifically because the powder's exact density isn't perfectly uniform across brands.
Small-Amount Chart (Where It Actually Matters)
Since baking powder is used in teaspoon and tablespoon amounts far more often than cups, this is the chart worth bookmarking:
| Amount | Grams (approx.) |
|---|---|
| ⅛ teaspoon | ~0.6 g |
| ¼ teaspoon | ~1.2 g |
| ½ teaspoon | ~2.4 g |
| 1 teaspoon | ~4.5 g |
| 1½ teaspoons | ~6.8 g |
| 2 teaspoons | ~9 g |
| 1 tablespoon | ~14 g |
| 2 tablespoons | ~28 g |
| ¼ cup | ~55 g |
| ½ cup | ~110 g |
| 1 cup | ~220 g |
Grams to Cups Chart
| Grams | Cups | Tablespoons |
|---|---|---|
| 5 g | ~0.02 cup | 0.36 tbsp |
| 10 g | ~0.05 cup | 0.7 tbsp |
| 20 g | ~0.09 cup | 1.4 tbsp |
| 50 g | ~0.23 cup | 3.6 tbsp |
| 100 g | ~0.45 cup | 7.1 tbsp |
| 150 g | ~0.68 cup | 10.7 tbsp |
| 220 g | 1 cup | 16 tbsp |
| 300 g | ~1.36 cups | 21.8 tbsp |
| 500 g | ~2.27 cups | 36.4 tbsp |
Baking Powder vs. Baking Soda: Not Interchangeable
These two live next to each other on the shelf and get confused constantly, but they solve different chemistry problems:
| Baking Powder | Baking Soda | |
|---|---|---|
| Composition | Alkali + built-in acid + starch | Pure alkali (sodium bicarbonate) only |
| Needs an acidic ingredient? | No — it's self-contained | Yes — buttermilk, yogurt, molasses, brown sugar, etc. |
| Typical use | Neutral batters: vanilla cake, pancakes, biscuits | Batters that already contain an acid |
| Grams per cup | ~220 g | ~220–230 g |
Baking soda is roughly 3–4 times stronger than baking powder by weight, which is why recipes never call for the two in equal amounts — swapping one for the other in the same quantity either leaves a batter flat (soda without enough acid to activate it) or gives it a harsh, metallic, soapy taste (soda used at a baking-powder-sized dose, reacting fully but overwhelming the batter). If a recipe uses both together, it's usually because the batter has some acidity that needs neutralizing (that's the soda's job) while still needing extra lift on top of it (that's the powder's job) — dropping either one changes both the rise and the flavor.
What Happens When the Amount Is Off
Because baking powder works in such small doses, the margin for error is smaller than most ingredients:
- Too much: batters rise fast and hard, often collapsing partway through baking. The crumb turns coarse with large irregular holes, and there's frequently a faint bitter or metallic aftertaste from the unreacted alkaline residue.
- Too little: baked goods come out flat, dense, and heavy, without the open, tender crumb the recipe was aiming for.
- Heaping instead of leveling a spoon: this is the most common real-world source of over-measuring — a rounded teaspoon can hold noticeably more than a level one, especially since baking powder tends to clump slightly and pile up on a spoon.
Testing Whether Your Baking Powder Still Works
Baking powder loses potency over time, especially once opened and exposed to humidity — and a weak batch will measure out perfectly by weight while still failing to lift anything in the oven. A quick freshness check: stir about a teaspoon into a small cup of hot water. Fresh baking powder should bubble up immediately and vigorously. If the reaction is weak or slow, it's a sign the powder has lost enough potency that it's worth replacing before it ruins a batch of baking.
How to Measure Baking Powder Correctly
- Stir the container first if the powder looks clumped — humidity can cause small lumps that make a spoonful heavier than it should be.
- Dip the spoon and level it off with a straight edge rather than the back of another spoon, which tends to compress the powder slightly.
- Double-check the label, not just the container shape — baking powder and baking soda often ship in visually similar packaging, and using one where a recipe calls for the other rarely ends well.
Quick Reference
- 1 tsp baking powder ≈ 4.5 g
- 1 tbsp baking powder ≈ 14 g
- ¼ cup baking powder ≈ 55 g
- 1 cup baking powder ≈ 220 g
The Bottom Line
Baking powder is one of the few ingredients where the cup conversion is mostly a reference point rather than something bakers actually use — real recipes live in teaspoons and tablespoons, and that's also where precision matters most, since even a slightly heaped spoon can visibly change a cake's texture. Because baking powder's exact density varies a bit by brand and formulation, treat any grams-per-cup figure (including the one here) as a solid working estimate rather than an exact constant, and lean on level spoon measurements — or a scale, for the most consistent results — over eyeballing a cup.
Trusted Sources
- Wikipedia — Baking powder — Formulation, base/acid/desiccant composition, and reaction mechanism.
- Encyclopedia Britannica — Baking powder — Definition, composition, and leavening behavior.
- American Chemical Society — Development of Baking Powder — Historical development of baking powder chemistry.
- National Institutes of Health (PMC) — Peer-reviewed research on baking powder and leavening acids in batters.
- Healthline — Baking Soda vs. Baking Powder — Practical comparison of when to use each leavening agent.
- The Bake School — What is Baking Powder — Baking-focused explainer, including the fresh-powder fizz test.
Other Ingredients
Grams-to-cups conversion isn't only useful for baking powder. Each of these has its own weight-per-cup because densities differ: