Water Density Calculator

Accurately determine water density with our free Water Density Calculator. Simply enter temperature, pressure, and salinity to get instant results based on UNESCO standards—perfect for science, research, and engineering applications

🌡️ Temperature

🔵 Pressure

🧂 Salinity

📊 Density Unit

📝 Description (Optional)

💧 Water Density Results

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kg/m³

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Description: –

Temperature: –

Pressure: –

Salinity: –

📌 Note:

Density is calculated using UNESCO 1980 approximation formulas. Actual values may vary slightly due to impurities, instrument calibration, or measurement precision.

📚 About Water Density

💧 What is Water Density?

Water density is the mass per unit volume. Pure freshwater at 4°C has maximum density of 999.97 kg/m³.

🌡️ Temperature Effect

Water density decreases as temperature increases. Hot water is less dense than cold water.

🧂 Salinity Effect

Seawater (35 ppt salinity) is about 2.5% denser than freshwater. Ocean salinity ranges from 32-37 ppt.

🔵 Pressure Effect

Water density increases with pressure. Deep ocean water is denser due to high pressure.

📊 Freshwater vs Seawater Density Comparison

Temperature (°C)	Freshwater (kg/m³)	Seawater 35ppt (kg/m³)	Difference
0	999.84	1028.11	+2.8%
5	999.96	1027.67	+2.8%
10	999.70	1026.95	+2.7%
15	999.10	1025.97	+2.7%
20	998.21	1024.76	+2.7%
25	997.05	1023.34	+2.6%
30	995.65	1021.73	+2.6%

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Water Density Calculator