Formula
Weight (lb) = gallons × 8.345 lb/gal × specific gravity. Tons = pounds ÷ 2,000 (US short tons).
Specific gravity compares a fluid's density with fresh water (1.00). Brine above 1.0 is heavier than water; oil and condensate below 1.0 are lighter.
Example
4,000 gallons of produced water at SG 1.10 → 4,000 × 8.345 × 1.10 ≈ 36,718 lb ≈ 18.4 tons.
Density varies
The fluid presets are typical values only. Salinity, dissolved solids, API gravity and temperature all change density — warm fluids are lighter per gallon than cold fluids. Use a measured specific gravity when you have one.
Frequently asked questions
How much does a gallon of water weigh?
About 8.34 pounds at room temperature.
Is produced water heavier than fresh water?
Usually. Dissolved salts raise specific gravity, often to 1.05–1.20 depending on the formation.