Baking Powder: Complete Baking Guide
Double-acting leavener for reliable rise
What Baking Powder Does in Baking
Baking powder is a complete leavening system: it contains baking soda, an acid (cream of tartar or sodium aluminum sulfate), and a starch. Most baking powder is double-acting — it reacts once when mixed with liquid and again when heated in the oven, providing two bursts of lift. It's essential for cakes, muffins, and quick breads.
Key Properties
- ▸Double-acting: reacts with liquid and heat
- ▸Neutral in flavor (contains both acid and base)
- ▸Use 1 tsp per 1 cup flour as a general rule
- ▸Goes stale — test by mixing 1 tsp in hot water (should bubble vigorously)
- ▸1 tsp = 4.6g
Quick Measurement Reference
| Teaspoons / Tbsp | Grams |
|---|---|
| 1 tsp | 1.5g |
| 1 tbsp | 4.6g |
| 2 tbsp | 9.2g |
Expert Baking Tips
- 1Test baking powder freshness: drop 1 tsp into hot water — if it bubbles actively, it's still good.
- 2Don't substitute baking soda for baking powder 1:1 — soda is 3–4x stronger and needs an acid.
- 3Old baking powder is the #1 reason cakes don't rise — replace every 6–12 months.
- 4For homemade baking powder: 1 tsp = ¼ tsp baking soda + ½ tsp cream of tartar.
⚠️ Common Mistakes to Avoid
- ✗Using expired baking powder — it's the most common reason baked goods don't rise.
- ✗Adding too much — excess baking powder leaves a bitter, metallic taste.
- ✗Confusing baking soda and baking powder — they are NOT interchangeable without adjustments.
Out of Baking Powder?
Find the best substitutes with exact ratios for any recipe.
See Baking Powder Substitutes →