⚖️ Gallons → Grams Converter
Estimate fluid weight from gallon volume and density.
Handy for logistics, chemical mixing, and food production where recipes specify gallons but inventory uses weight.
Pure water at ~4°C.
Grams: 3,785.4118 g
Kilograms: 3.785412 kg
Pounds: 8.345404 lb
How to Use This Calculator
Enter gallons
Input the liquid volume you plan to weigh.
Select density
Choose a preset fluid or enter a custom density in grams per cubic centimeter (g/cc).
Review mass outputs
See the equivalent mass in grams, kilograms, and pounds to satisfy any reporting requirements.
Formula
Cubic centimeters = Gallons × 3,785.411784
Mass (g) = Volume (cc) × Density (g/cc)
Kilograms = Grams ÷ 1,000
Pounds = Grams ÷ 453.59237
Use the formula breakdown to confirm the calculation logic or perform the conversion manually if needed.
Full Description
Converting gallons to grams bridges the gap between volume-based recipes and weight-based inventory systems. It also helps ensure shipping labels and safety documentation reflect accurate totals.
Because density changes with temperature and composition, always use the value that matches your actual substance and conditions.
The calculator delivers grams, kilograms, and pounds, simplifying cross-border operations and compliance paperwork.
Frequently Asked Questions
Do I need the fluid density?
Yes. Volume-to-mass conversions always require density. Use a preset or measure it directly.
Can I convert Imperial gallons?
This tool uses U.S. gallons. Convert Imperial gallons to U.S. gallons (×1.20095) before using, or extend the tool.
What about liters?
One gallon is 3.78541 liters. Multiply liters by density (kg/L) to get kilograms, then convert to grams if needed.
Does temperature matter?
Yes. Densities vary with temperature. For precise work, use the density measured at your processing temperature.