Water Weight Calculator
Precisely calculate the weight of water from any volume. Adjust for temperature to account for density changes, and view results in kilograms, pounds, ounces, or grams.
Step 1: Enter Volume
Water Density Basics
At room temperature (20°C / 68°F), pure water has a density of approximately 0.9982 g/mL (1 kg/L). Temperature changes cause slight density variations – use the temperature selector in Step 2 for more accuracy.
Step 2: Temperature & Preferred Unit
💧 Why temperature matters
Water expands when heated, reducing density. The same volume of boiling water weighs ~4% less than ice-cold water. Use the dropdown to match your actual water temperature.
Water Weight Results
Calculated Water Weight
Approximate Weight of Common Containers
| Container | Typical Volume | Water Weight (selected unit) |
|---|
Values based on room temperature water (20°C). Slight variations with temperature.
Weight Change with Temperature (for 1 Liter)
Weight Formula
Mass = Volume × Density
First convert your volume to liters. Multiply by the density (kg/L) corresponding to the water temperature. Then convert to your preferred weight unit (1 kg = 2.20462 lb = 35.274 oz = 1000 g).
Example: 5 US gallons → 5 × 3.78541 = 18.927 L. At 20°C: 18.927 × 0.9982 = 18.89 kg → 41.64 lb.
Need High-Accuracy Water Density?
Our lab-grade analysis accounts for dissolved minerals, salinity, and precise temperature. Perfect for industrial processes, aquariums, or scientific experiments.
Consult a Water Specialist