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Volume
Teaspoons to Gallons
Convert teaspoons (tsp) to gallons (gal). Type a value below to see the result update instantly. Reference table and formula included.
Calculator
1 tsp = 0.001302 gal
Teaspoons to Gallons Conversion Table
Common values, ready to copy:
| teaspoons | gallons |
|---|---|
| 1 tsp | 0.001302 gal |
| 2 tsp | 0.002604 gal |
| 5 tsp | 0.00651 gal |
| 10 tsp | 0.013021 gal |
| 25 tsp | 0.032552 gal |
| 50 tsp | 0.065104 gal |
| 100 tsp | 0.130208 gal |
| 1,000 tsp | 1.3021 gal |
Formula
gallons = teaspoons × 1.30208353e-3
Volume conversions use US customary measure (the cup, fluid ounce, and gallon are US definitions, not imperial). 1 US cup = 236.588 mL, 1 US gallon = 3.785411784 L.
About Teaspoons and Gallons
Teaspoons (tsp): Standardized at about 5 mL for cooking purposes; US legal definition is exactly 4.92892 mL, but international cooking convention uses 5 mL even in the US. Common uses: Small cooking measurements (spices, baking powder, vanilla extract), liquid medication dosing for adults (often 1 or 2 teaspoons = 5 or 10 mL).
Gallons (gal): The US gallon (3.785 L) descends from Queen Anne's 1707 wine gallon; the UK switched to a larger imperial gallon (4.546 L) in 1824, but the US kept the original definition. Common uses: US fuel sales, US milk packaging, lawn and garden chemicals, swimming pool volumes, and aquariums.
How the conversion works
Volume conversions use US customary measure (the cup, fluid ounce, and gallon are US definitions, not imperial). 1 US cup = 236.588 mL, 1 US gallon = 3.785411784 L.
The exact relationship is gallons = teaspoons × 1.30208353e-3, which the calculator at the top of this page applies in both directions. Type into either field and the other updates immediately.
When this conversion matters
Converting between teaspoons and gallons comes up wherever volume measurements move between systems — from one country's conventions to another's, from a scientific reference to a practical specification, or from one industry's working unit to another's. The calculator and reference table above cover the everyday range; for unusual values you can type any number into either field.