Tablespoons to US gallons
US gallons = tablespoons × 0.00390625
Reverse: US gallons to tablespoons
How to convert tablespoons to US gallons
One tablespoon is 0.00390625 US gallons, so multiply the number of tablespoons by 0.00390625. For example, 20 tablespoons is 20 × 0.00390625 = 0.078125 US gallons. To go back, divide by the same number, or multiply by 256.
Quick estimate
Multiplying by about 0.004 gets within 2.4% of the exact answer, which is enough to check that a result makes sense.
Where it comes up
Volume conversions come up in recipes, fuel economy, drink and bottle sizes, garden and pool water, and engine sizes.
| tablespoons | US gallons |
|---|---|
| 1 tbsp | 0.00390625 gal |
| 2 tbsp | 0.0078125 gal |
| 3 tbsp | 0.01171875 gal |
| 4 tbsp | 0.015625 gal |
| 5 tbsp | 0.01953125 gal |
| 6 tbsp | 0.0234375 gal |
| 7 tbsp | 0.02734375 gal |
| 8 tbsp | 0.03125 gal |
| 9 tbsp | 0.03515625 gal |
| 10 tbsp | 0.0390625 gal |
| 11 tbsp | 0.04296875 gal |
| 12 tbsp | 0.046875 gal |
| 13 tbsp | 0.05078125 gal |
| 14 tbsp | 0.0546875 gal |
| 15 tbsp | 0.05859375 gal |
| 16 tbsp | 0.0625 gal |
| 17 tbsp | 0.06640625 gal |
| 18 tbsp | 0.0703125 gal |
| 19 tbsp | 0.07421875 gal |
| 20 tbsp | 0.078125 gal |
| 25 tbsp | 0.09765625 gal |
| 30 tbsp | 0.1171875 gal |
| 40 tbsp | 0.15625 gal |
| 50 tbsp | 0.1953125 gal |
| 60 tbsp | 0.234375 gal |
| 70 tbsp | 0.2734375 gal |
| 75 tbsp | 0.29296875 gal |
| 80 tbsp | 0.3125 gal |
| 90 tbsp | 0.3515625 gal |
| 100 tbsp | 0.390625 gal |
| 120 tbsp | 0.46875 gal |
| 150 tbsp | 0.5859375 gal |
| 200 tbsp | 0.78125 gal |
| 250 tbsp | 0.9765625 gal |
| 300 tbsp | 1.171875 gal |
| 400 tbsp | 1.5625 gal |
| 500 tbsp | 1.953125 gal |
| 750 tbsp | 2.929688 gal |
| 1,000 tbsp | 3.90625 gal |
| 1,500 tbsp | 5.859375 gal |
| 2,000 tbsp | 7.8125 gal |
| 5,000 tbsp | 19.53125 gal |
| 10,000 tbsp | 39.0625 gal |
Questions
How many US gallons are in a tablespoon?
0.00390625 US gallons.
How do I convert tablespoons to US gallons in a spreadsheet?
Put the value in A1 and type =A1*0.00390625, then fill the formula down the column.
Are the values in the table exact?
They are calculated from the exact definitions of the units and rounded only for display. Open any row for the full working.