How Much Does a Gallon of Sand Weigh? (Quick Answer)
A gallon of dry sand typically weighs between 12 and 13 pounds. For most construction or landscaping purposes, 12.5 pounds per gallon is a reliable average. This weight changes depending on whether the sand is wet, compacted, or mixed with other materials.
What Affects the Weight
Dry loose sand has a density of about 100 pounds per cubic foot, which works out to roughly 12.5 pounds per gallon (since a gallon is 0.1337 cubic feet). Wet sand can weigh 14 to 16 pounds per gallon because water fills the spaces between grains. For a quick estimate, use 12.5 pounds for dry sand. A 5-gallon bucket of dry sand weighs about 62.5 pounds.
A Quick Worked Example
Say you need to fill a sandbox that holds 10 cubic feet. That is about 75 gallons (10 cubic feet times 7.48 gallons per cubic foot). Using the 12.5 pounds per gallon average, you need about 938 pounds of dry sand. If you buy 50-pound bags, that is 19 bags. If the sand is damp, you might need fewer bags by volume, but each bag still weighs 50 pounds — the moisture just takes up space that dry sand would fill.
Key Takeaways
- A gallon of dry sand weighs about 12.5 pounds (5.7 kg). Wet or compacted sand can be 14 to 16 pounds per gallon.
- The weight depends on moisture content and how tightly the sand is packed. Dry loose sand is the lightest.
- For bulk projects, use the cubic foot density (100 pounds per cubic foot for dry sand) and convert to gallons as needed Engineering ToolBox.
- Always check the specific sand type and moisture level if exact weight matters for structural or transport limits.
