Convert US gallons to US cups
1 US gallon is 16 cup. One US gallon is exactly 16 US cups.
One US gallon is 16 US cups. To convert US gallons to US cups, multiply by 16; to go the other way, divide by 16 or multiply by 0.0625. The factor is exact rather than rounded: it follows from NIST Handbook 130. Exactly 231 cubic inches.
Factor checked against the defining standard · How we check
- US gallons × 16
1 * 1616 cup
1 US gallon in every volume unit
| Unit | Value | Exact factor |
|---|---|---|
| US teaspoons | 768 tsp | × 768 |
| US tablespoons | 256 tbsp | × 256 |
| US fluid ounces | 128 fl oz | × 128 |
| US cups | 16 cup | × 16 |
| US pints | 8 pt | × 8 |
| US quarts | 4 qt | × 4 |
| US gallons (as entered) | 1 gal | — |
| milliliters | 3,785.411784 ml | × 3,785.411784 |
| liters | 3.785411784 L | × 3.785411784 |
| imperial gallons | 0.8326741846 gal (UK) | × 0.832674184629 |
| imperial quarts | 3.330696739 qt (UK) | × 3.33069673852 |
| imperial pints | 6.661393477 pt (UK) | × 6.66139347703 |
| imperial fluid ounces | 133.2278695 fl oz (UK) | × 133.227869541 |
| imperial gills | 26.64557391 gi (UK) | × 26.6455739081 |
| cubic millimetres | 3,785,411.784 mm³ | × 3,785,411.784 |
| cubic centimetres | 3,785.411784 cm³ | × 3,785.411784 |
| cubic inches | 231 in³ | × 231 |
| cubic feet | 0.1336805556 ft³ | × 0.133680555556 |
| cubic yards | 0.004951131687 yd³ | × 0.00495113168724 |
| cubic metres | 0.003785411784 m³ | × 0.003785411784 |
Factors are entered by hand from NIST Handbook 130 rather than derived from a units library, so the ones that terminate are exact rather than rounded.
How do you convert US gallons to US cups? The converter and the working
- 1.Take the measurement in US gallons.
- 2.Multiply by 16 — that is how many US cups fit in one US gallon.
- 3.To go back the other way, divide by 16, or multiply by 0.0625.
Worked example: 25 US gallons to US cups
- Formula
- gal × 16 = cup
- Arithmetic
- 25 × 16 = 400 cup
- Answer
- 25 gal = 400 cup
The factor is exact, so this figure is exact too — only the display is rounded.
US gallons to US cups conversion table
| US gallons | US cups |
|---|---|
| 1 gal | 16 cup |
| 2 gal | 32 cup |
| 3 gal | 48 cup |
| 4 gal | 64 cup |
| 5 gal | 80 cup |
| 6 gal | 96 cup |
| 7 gal | 112 cup |
| 8 gal | 128 cup |
| 9 gal | 144 cup |
| 10 gal | 160 cup |
| 12 gal | 192 cup |
| 15 gal | 240 cup |
| 20 gal | 320 cup |
| 25 gal | 400 cup |
| 50 gal | 800 cup |
| 100 gal | 1,600 cup |
| 200 gal | 3,200 cup |
| 300 gal | 4,800 cup |
| 500 gal | 8,000 cup |
| 1000 gal | 16,000 cup |
| 2000 gal | 32,000 cup |
| 5000 gal | 80,000 cup |
| 10000 gal | 160,000 cup |
What is a US gallon?
Exactly 231 cubic inches. The imperial gallon is 4.546 liters, so US and UK fuel economy figures are not comparable.
What is a US cup?
Eight US fluid ounces, about 236.6 ml. The "legal" cup on nutrition labels is a rounded 240 ml.
How many US cups are in a US gallon?
One US gallon is 16 US cups, exactly. Going the other way, one US cup is 0.0625 US gallons. Both figures come from the same defined relation rather than from a measurement, which is why they are the same today as they were in 1959.
Every volume unit here
The whole group — 20 units with their symbols and the size of each one in liters — is on the conversion index, along with every pair it makes. The table above already gives each of them relative to a US gallon.
Cite this page
- APA
- Rule Calculator. (2026). Convert US gallons to US cups. Rule Calculator. https://rulecalculators.com/convert/gallon-to-cup
- MLA
- "Convert US gallons to US cups." Rule Calculator, August 16, 2026, https://rulecalculators.com/convert/gallon-to-cup.
- Chicago
- Rule Calculator. "Convert US gallons to US cups." Rule Calculator. Last reviewed August 16, 2026. https://rulecalculators.com/convert/gallon-to-cup.
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Questions people actually ask
- How many US cups are in a US gallon?
- 16. Eight US fluid ounces, about 236.6 ml. The "legal" cup on nutrition labels is a rounded 240 ml.
- How do I convert US cups back to US gallons?
- Divide by 16, or multiply by 0.0625 — they are the same operation.
Other volume conversions
US cups to US gallons — the same conversion the other way.