Pounds to Gallons (US) Converter (Fresh water at 20 C (room temperature))
1 lb equals 0.12004166 gal, and 1 gal equals 8.3304411 lb for fresh water at 20 c (room temperature). Enter a value in either box to convert pounds to gallons (us) (fresh water at 20 c (room temperature)) and back. Formula: mass = volume x density (water at 20 C is 0.998207 g/mL; 1 US gal = 3.785411784 L).
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1 lb = 0.12004166 gal
Results shown are estimates for informational purposes only. Nothing on CalcFlow is financial, tax, legal, or medical advice. Always consult a qualified professional before making important decisions.
Pounds to Gallons (US) Conversion Table
| Pounds | Gallons (US) |
|---|---|
| 1 lb | 0.12004166 gal |
| 2 lb | 0.24008332 gal |
| 5 lb | 0.60020831 gal |
| 10 lb | 1.2004166 gal |
| 20 lb | 2.4008332 gal |
| 50 lb | 6.0020831 gal |
| 100 lb | 12.004166 gal |
Gallons (US) to Pounds Conversion Table
| Gallons (US) | Pounds |
|---|---|
| 1 gal | 8.3304411 lb |
| 2 gal | 16.660882 lb |
| 5 gal | 41.652206 lb |
| 10 gal | 83.304411 lb |
| 20 gal | 166.60882 lb |
| 50 gal | 416.52206 lb |
| 100 gal | 833.04411 lb |
Worked example: 10 lb = 1.2004166 gal for fresh water at 20 c (room temperature). A 10 US gallon aquarium holds 10 x 3.785411784 x 0.998207 = 37.79 kg of fresh water at 20 C, about 83.3 pounds.
Need other units? Open the full Water Volume to Weight Converter.
Popular Water Weight Conversions
Formula
mass = volume x density (water at 20 C is 0.998207 g/mL; 1 US gal = 3.785411784 L)Understanding Water Weight Conversion
The metric system was built around water: one liter of pure water at its densest, about 4 degrees C, has a mass of almost exactly one kilogram. At room temperature the figure is 0.998 kg per liter, and hot water is lighter per liter. A US gallon of fresh water weighs about 8.33 pounds, and a cubic foot weighs about 62.3 pounds. Seawater is about 2.5 percent denser than fresh water because of dissolved salt.
Tips and Best Practices
- 1For quick estimates use 1 liter = 1 kilogram and 1 US gallon = 8.34 pounds.
- 2A 50 gallon water heater holds roughly 416 pounds of water when full.
- 3Use the temperature selector for hot or cold water if precision matters.
Real-World Example
A 10 US gallon aquarium holds 10 x 3.785411784 x 0.998207 = 37.79 kg of fresh water at 20 C, about 83.3 pounds.
Common Mistakes to Avoid
- Using the US gallon figure (8.33 lb) for an imperial gallon, which holds about 10.0 lb.
- Forgetting that a container adds its own weight to the water.
- Using 1 kg per liter for seawater or brine.
How to Use
- Type a number in the Pounds box.
- The Gallons (US) result appears instantly; you can also edit the Gallons (US) box to convert backwards.
- Use the swap button to reverse the direction and Copy result to copy the answer.
Frequently Asked Questions
How many gallons (us) are in 1 lb?
How many pounds are in 1 gal?
What is the formula to convert pounds to gallons (us)?
How much does a liter of water weigh?
Sources: Water density from the CRC Handbook of Chemistry and Physics (g/mL): 4 C 0.999975, 20 C 0.998207, 25 C 0.997048, 100 C 0.958365; seawater is typically about 1.025. Volume units: NIST Handbook 44 Appendix B.