This converter turns teaspoons into US gallons instantly, using the exact factor 1 teaspoon = 0.001302083333 US gallons. Type any number and the result updates as you go — nothing is sent to a server, so the arithmetic happens entirely in your browser.
The smallest standard kitchen measure, 4.93 millilitres. Exactly 231 cubic inches — the US liquid gallon used for fuel and milk.
Because the relationship is a simple proportion, one multiplication does the whole job. The table further down gives pre-computed values for the amounts people look up most often, and the result panel also reports the reverse conversion so you can check the figure both ways.
The formula
teaspoons- The amount you are converting, measured in teaspoons
0.001302083333- The exact number of US gallons in one teaspoon
US gallons- The converted result
How it works, step by step
- Enter the number of teaspoons you want to convert.
- The value is multiplied by 0.001302083333, the exact conversion factor.
- The result is displayed in US gallons, rounded for readability.
- The unrounded value and the reverse conversion appear underneath so you can verify it.
Worked examples
Converting 5 teaspoons
Multiply 5 by 0.0013020833. That gives 0.00651 US gallons. A quick sanity check: one teaspoon is smaller than one US gallon, so the number should get smaller — and it does.
Converting 72 teaspoons
72 × 0.0013020833 = 0.09375 US gallons. Working backwards, 0.09375 ÷ 0.0013020833 returns 72 teaspoons, which confirms the factor is applied the right way round.
How to read your score
Frequently asked questions
How many US gallons are in one teaspoon?
Exactly 0.001302083333. Every conversion on this page is that single number multiplied by your input, so the result carries no rounding error beyond what is shown.
What is the formula to convert teaspoons to US gallons?
Us Gallons = teaspoons × 0.001302083333. To reverse it, divide instead: teaspoons = US gallons ÷ 0.001302083333, which is the same as multiplying by 768.
Is the teaspoon bigger than the US gallon?
No. One teaspoon is only 0.00130208 of a US gallon, so the US gallon is the larger unit.
Why does my answer differ slightly from other teaspoons to us-gallons converters?
Most differences come from rounding the factor too early. This tool keeps full double precision through the calculation and only rounds at the final display step, and it also shows the unrounded value so you can see exactly where any difference appears.
What is a teaspoon?
The smallest standard kitchen measure, 4.93 millilitres.
What is a US gallon?
Exactly 231 cubic inches — the US liquid gallon used for fuel and milk.
Teaspoons to US gallons reference table
| Teaspoons | Us Gallons |
|---|---|
| 0.5 tsp | 0.000651 gal |
| 1 tsp | 0.001302 gal |
| 2 tsp | 0.002604 gal |
| 3 tsp | 0.003906 gal |
| 5 tsp | 0.00651 gal |
| 10 tsp | 0.013021 gal |
| 15 tsp | 0.019531 gal |
| 20 tsp | 0.026042 gal |
| 25 tsp | 0.032552 gal |
| 50 tsp | 0.065104 gal |
| 75 tsp | 0.097656 gal |
| 100 tsp | 0.130208 gal |
| 250 tsp | 0.325521 gal |
| 500 tsp | 0.651042 gal |
| 1000 tsp | 1.3021 gal |
Exact factor: 1 teaspoon = 0.001302083333 US gallons. Values rounded for display.