How Many Teaspoons Are in a Cup?
Quick Answer: 48 teaspoons in 1 US cup · 16 tbsp · 8 fl oz · 240 mL
At a glance
- 1 US cup = 48 teaspoons (= 16 tbsp × 3 tsp per tbsp — the cascade that makes the cup hierarchy work)
- Cup fractions: ¼ cup = 12 tsp · ⅓ cup = 16 tsp · ½ cup = 24 tsp · ⅔ cup = 32 tsp · ¾ cup = 36 tsp
- 1 US teaspoon = 5 mL (the standard on medicine labels and nutrition facts)
A US cup holds 48 teaspoons. That number comes from the double cascade of US volume units: a cup is 16 tablespoons, and each tablespoon is 3 teaspoons, so 16 × 3 = 48. Most of the time, nobody counts out 48 teaspoons — you use a ¼-cup or ⅓-cup measure to move bigger volumes. But cup fractions are where this conversion earns its keep: "how many teaspoons in ⅓ cup" is a more useful question than "how many in a full cup", because odd fractions don\'t match standard measuring spoons cleanly. The table below answers every common fraction directly.
What does a cup look like next to 48 teaspoons?
cup → tsp Quick Converter
Need more features? Try our complete cup to teaspoon converter.
1 cup on the teaspoon scale
1 cup = 48 tsp
Why 48? The teaspoon→tablespoon→cup cascade
The 48 number feels arbitrary until you see the structure. US spoon-to-cup conversions are a two-step cascade:
- Step 1: 1 tablespoon = 3 teaspoons (the base ratio — the only step that\'s not a power of 2)
- Step 2: 1 cup = 16 tablespoons (a clean power-of-2 doubling: ½ cup = 8 tbsp, ¼ cup = 4 tbsp, ⅛ cup = 2 tbsp)
- Combined: 1 cup = 16 × 3 = 48 teaspoons
Once you memorize 3 tsp = 1 tbsp and 16 tbsp = 1 cup, every other cup-fraction-to-teaspoon conversion falls out of the arithmetic: ⅓ cup = ⅓ × 16 = 5⅓ tbsp = 5⅓ × 3 = 16 tsp. ¼ cup = 4 tbsp = 12 tsp. The reason 48 — rather than a rounder number like 50 — is that 16 and 3 happen to multiply to 48, which is itself divisible by 2, 3, 4, 6, and 8. That makes every common cup fraction land on a whole-teaspoon count. It\'s an accidentally useful property of the US cup\'s power-of-2 structure.
Teaspoons in cup fractions — every common amount
Cup fractions are where this conversion does real work in the kitchen. Here\'s the full chart for every fraction you\'ll find in a US recipe, with the matching tablespoon and fluid-ounce figures.
| Cup fraction | Teaspoons | Tablespoons | Fluid ounces | Millilitres |
|---|---|---|---|---|
| 1/16 cup | 3 tsp | 1 tbsp | ½ fl oz | 15 |
| ⅛ cup | 6 tsp | 2 tbsp | 1 fl oz | 30 |
| ¼ cup | 12 tsp | 4 tbsp | 2 fl oz | 59 |
| ⅓ cup | 16 tsp | 5⅓ tbsp | 2.67 fl oz | 79 |
| ⅜ cup | 18 tsp | 6 tbsp | 3 fl oz | 89 |
| ½ cup | 24 tsp | 8 tbsp | 4 fl oz | 118 |
| ⅝ cup | 30 tsp | 10 tbsp | 5 fl oz | 148 |
| ⅔ cup | 32 tsp | 10⅔ tbsp | 5.33 fl oz | 158 |
| ¾ cup | 36 tsp | 12 tbsp | 6 fl oz | 177 |
| ⅞ cup | 42 tsp | 14 tbsp | 7 fl oz | 207 |
| 1 cup | 48 tsp | 16 tbsp | 8 fl oz | 237 |
| 1¼ cups | 60 tsp | 20 tbsp | 10 fl oz | 296 |
| 1½ cups | 72 tsp | 24 tbsp | 12 fl oz | 355 |
| 2 cups | 96 tsp | 32 tbsp | 16 fl oz | 473 |
Every fraction with a clean whole-tablespoon count (⅛, ¼, ⅜, ½, ⅝, ¾, ⅞, and full cups) has a clean whole-teaspoon count too. Only ⅓ and ⅔ give fractional tablespoon counts — but their teaspoon counts (16 and 32) are still whole numbers, because the 3× teaspoon multiplier cancels out the /3 in the cup fraction.
Did you know?
The US teaspoon was standardized at 5 mL (about 1/3 tablespoon) through a combination of 19th-century apothecary practice and 20th-century nutrition-science needs. The original "teaspoon" was literally the spoon used to stir tea, which varied from 4-6 mL depending on region and teacup style. Apothecaries in the 1800s settled on a 5 mL "fluidram" as a standard medicine dose — small enough to taste quickly, large enough to measure accurately with a dropper. The FDA adopted 5 mL as the nutrition-labeling teaspoon in the 1970s, which cemented it as the universal kitchen standard. That's why every US medicine label, every nutrition facts panel, and every measuring spoon set uses the same 5 mL teaspoon today.
How many cups are in a teaspoon?
1/48 cup per teaspoon (about 0.021 cup). A teaspoon is much smaller than a cup, so the reverse direction isn\'t a practical question — you\'d never measure a cup-amount using teaspoons alone. Useful reverse conversions for round numbers:
- 3 tsp = 1 tbsp = 1/16 cup
- 6 tsp = 2 tbsp = 1/8 cup (1 fl oz)
- 12 tsp = 4 tbsp = ¼ cup
- 24 tsp = 8 tbsp = ½ cup
- 48 tsp = 16 tbsp = 1 cup
Common cup-to-teaspoon amounts
The fraction table above covers single-cup amounts. For recipes that call for multiples of cups, here\'s the larger scale:
| Cups | Teaspoons | Tablespoons |
|---|---|---|
| 1 cup | 48 tsp | 16 tbsp |
| 2 cups | 96 tsp | 32 tbsp |
| 3 cups | 144 tsp | 48 tbsp |
| 4 cups (1 quart) | 192 tsp | 64 tbsp |
| 8 cups (½ gallon) | 384 tsp | 128 tbsp |
Nobody measures 2 cups in teaspoons — this chart exists mostly to show the scale, and to help when scaling a small recipe (given in tsp) up to batch-cooking or bar-batching size (given in cups).
Word order matters
- "How many teaspoons in a cup?" → 48
- "How many cups in a teaspoon?" → 1/48 (the reverse, hardly ever asked)
- "How many teaspoons in ⅓ cup?" → 16 (the most-asked fraction variant)
- "How many half-teaspoons in a cup?" → 96 (twice as many, because each tsp has 2 half-tsp)
The formula
teaspoons = cups × 48
The 48 factor is exact by the definitions of the US cup (8 fl oz), the US fluid ounce (29.5735 mL), and the US teaspoon (1/6 fl oz, 4.929 mL). The cup-to-teaspoon ratio is 48:1 in US customary, and the same ratio holds in US legal cups (240 mL ÷ 5 mL = 48) because the FDA rounded both the cup and the teaspoon consistently for nutrition-label purposes. The metric cup (250 mL, used in Europe, Australia, and NZ) breaks the clean 48:1 ratio slightly — 250 mL ÷ 5 mL = 50 metric teaspoons per metric cup.
How to measure cup fractions with teaspoons
When to use teaspoons for cup amounts (rarely)
Measuring a full cup in teaspoons takes 48 pours and is slow and error-prone. The reason to even ask "how many teaspoons in a cup" is usually because you\'re trying to measure a small cup fraction (⅛, ¼, ⅓) and your measuring-cup set is missing the right size. If your measuring cup set has the standard ¼, ⅓, ½, and 1-cup sizes, use those — they\'re always faster and more accurate.
When it does help: missing measuring cup
If your ⅓-cup measure is dirty or missing, 16 teaspoons fills the gap — same volume. Similarly, 12 teaspoons replaces a ¼-cup measure; 24 teaspoons replaces a ½-cup measure. Use a tablespoon measure if you have one (it\'s 3 teaspoons in one pour) to speed up the measurement — 4 tablespoons for ¼ cup, 5⅓ tablespoons for ⅓ cup, 8 tablespoons for ½ cup.
A note on packing and levelling
Teaspoon-level accuracy matters most for baking powder, baking soda, yeast, and salt — the ingredients that turn into volumes of cup-scale ingredients through leavening and dissolution. Scoop, level with a knife\'s edge, and don\'t pack unless the recipe specifies packed (as with brown sugar). For flour and sugar, the ⅓-cup or ¼-cup scoop is less prone to packing errors than stacking multiple teaspoons.
Frequently Asked Questions
How many teaspoons are in a cup?
48 teaspoons in 1 US cup. The math: a cup is 16 tablespoons, each tablespoon is 3 teaspoons, so 16 × 3 = 48. That's also 8 fluid ounces or 240 mL in US nutrition-labeling rounding.
How many teaspoons are in 1/4 cup?
12 teaspoons in a quarter cup. A 1/4 cup is 4 tablespoons, and each tablespoon is 3 teaspoons, so 4 × 3 = 12. This is one of the most-asked fraction conversions because 1/4 cup shows up constantly in recipes for oil, milk, or stock amounts.
How many teaspoons are in 1/3 cup?
16 teaspoons in a third of a cup. A third cup is 5⅓ tablespoons, and 5⅓ × 3 = 16. This one surprises people because 1/3 doesn't divide cleanly into most intermediate units, but it does give a round tablespoon-to-teaspoon number at 16 tsp.
How many teaspoons are in 2/3 cup?
32 teaspoons in 2/3 cup — exactly double the 1/3-cup answer. Also 10⅔ tablespoons or 5.33 fluid ounces. If a recipe calls for 2/3 cup of liquid and you're measuring with teaspoons, you'd need 32 refills of a standard 1-tsp measure. Usually easier to use a tablespoon measure and count to 10⅔, or just use a 2/3-cup measuring cup directly.
How many teaspoons are in 1/2 cup?
24 teaspoons in half a cup. Half of 48 is 24 — simple doubling/halving of the full cup answer. A half cup is also 8 tablespoons or 4 fluid ounces.
How many teaspoons are in 3/4 cup?
36 teaspoons in 3/4 cup. Three-quarters of 48 is 36, or equivalently 12 tablespoons × 3. Also 6 fluid ounces. Common in bread recipes for flour or water amounts.
How many teaspoons are in 1/8 cup?
6 teaspoons in 1/8 cup. 1/8 of 48 is 6, or equivalently 2 tablespoons (the clean conversion). 1/8 cup is also exactly 1 fluid ounce — so "6 teaspoons = 1 fl oz" is a handy equivalence to remember.
How many teaspoons are in 1/3 cup of butter?
16 teaspoons — same answer as any 1/3 cup liquid, because teaspoons measure volume. A 1/3 cup of softened butter is 16 tsp = 5⅓ tbsp = 5.33 fl oz by volume. By weight, it's about 2.67 oz (75 g). Most US butter is measured in whole sticks (8 tbsp each), so 1/3 cup of butter is 2/3 of a stick — easier to measure with the wrapper markings than to count 16 teaspoons.
How do I convert tsp to cup?
Divide by 48. 48 tsp = 1 cup; 24 tsp = ½ cup; 12 tsp = ¼ cup. The shortcut is dividing first by 3 (to get tablespoons) and then by 16 (to get cups), but direct division by 48 works just as well: 6 tsp = 1/8 cup, 24 tsp = 1/2 cup, etc.
Related Cooking Conversions
- How many teaspoons in a tablespoon? — 3 tsp
- How many tablespoons in a cup? — 16 tbsp
- How many ounces in a tablespoon? — 0.5 fl oz
- How many tablespoons in an ounce? — 2 tbsp
- How many ounces in a cup? — 8 fl oz
- How many mL in a cup? — 240 mL
- How many cups in a pint? — 2 cups
- Cooking Volume to Weight Converter — "How much does a cup of flour weigh?"
- Cooking Weight to Volume Converter — by-ingredient conversions
- All Cooking Measurement Tools
This page uses the US teaspoon (5 mL, 1/6 fl oz) and US customary cup (236.6 mL, 8 fl oz). Numbers in the fraction table are exact for the 48:1 US cup-to-teaspoon ratio; the mL column rounds to whole numbers for readability. The metric cup (250 mL) used in Europe and Australia gives 50 teaspoons per metric cup, slightly different from the 48 US customary figure.