Sixteen is the magic number of the baking world. Cup-to-tablespoon conversions come up every time you scale a recipe, and the math is friendlier than it looks — with one notorious exception.
Quick Answer: 1 US cup equals 16 US tablespoons.
The 16 Rule
One cup holds 16 tablespoons. That is because 1 cup = 8 fluid ounces and 1 tablespoon = half an ounce: 8 ÷ 0.5 = 16. To convert cups to tablespoons, multiply by 16. To go back, divide by 16.
The 1/3-Cup Trap
Here is where cooks get burned: one-third cup is NOT 5 tablespoons. It is 5 tablespoons PLUS 1 teaspoon (16 ÷ 3 = 5.33 tbsp). Forgetting that extra teaspoon throws off delicate baking ratios — always add it.
Cups to Tablespoons Chart
1/4 cup = 4 tbsp. 1/3 cup = 5 tbsp + 1 tsp. 1/2 cup = 8 tbsp. 2/3 cup = 10 tbsp + 2 tsp. 3/4 cup = 12 tbsp. 1 cup = 16 tbsp. 2 cups = 32 tbsp.
Scaling Examples
Halving 3/4 cup of oil? Use 6 tablespoons. Doubling 1/3 cup of sugar? Use 10 tablespoons plus 2 teaspoons. Need 1 cup but only have a tablespoon? Count out 16 level scoops. These cup and spoon volumes follow the US customary definitions maintained by NIST.
Scaling Recipes Without a Chart
The chart matters most when the recipe does not match your pan. Doubling a sauce that calls for a third of a cup of oil means 10 tablespoons plus 2 teaspoons — awkward until you remember the ladder: double the tablespoons, not the cup fraction. Halving works the same way in reverse: a quarter cup becomes 2 tablespoons, and an eighth of a cup is a single tablespoon plus a pinch.
Bakers scaling a cake for a smaller tin use the same trick for every liquid and fat in the formula. Learn 16 per cup and the two anchors — a third of a cup is 5 tablespoons plus 1 teaspoon, a quarter is 4 tablespoons — and any scaling problem solves itself at the counter.
Butter is where most cooks meet this conversion first. An American stick of butter is half a cup — 8 tablespoons — and the wrapper prints the tablespoon lines so you can slice without a scale. European butter blocks skip the marks entirely because their recipes weigh in grams. When a recipe crosses the Atlantic, 1 tablespoon of butter is about 14 grams, and half a cup is one 113-gram stick. Anchor to those, and the fat in any formula converts cleanly either way.
Handy tool: Need the number fast? Use our free Cups to Tablespoons Converter — instant results, no sign-up.
Conclusion
Sixteen tablespoons in every cup — one anchor, and the entire conversion chart lives in your head rent-free. With the two fractional anchors beside it (a third of a cup is 5 tablespoons plus a teaspoon; a quarter cup is 4 flat), you can measure, double, halve, and rescue any recipe without a phone in your flour-covered hand.
That is the real prize here: not the number itself, but the independence it buys at the counter. Charts fade, batteries die, and printouts get splashed. Ratios stay. Learn 16-to-1 once, and cups and tablespoons will translate for each other for the rest of your cooking life.
Frequently Asked Questions
How many tablespoons in a cup?
16 US tablespoons per cup.
How many tablespoons in half a cup?
8 tablespoons.
How many tablespoons in 1/3 cup?
5 tablespoons + 1 teaspoon (5.33 tbsp).
How many tablespoons in 2 cups?
32 tablespoons.
How do you convert cups to tablespoons?
Multiply cups by 16.