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Water Pressure at Depth Calculator

Quick answer

This calculator computes gauge and total water pressure at any depth: enter fluid density, depth, and surface pressure for instant pascal results.

Figures are estimates from this calculator’s standard formula — adjust the inputs in the tool below for your exact number.

How the Depth Pressure Calculator Works

gauge = density x 9.81 x depth; total = surface pressure + gauge

Hydrostatic pressure grows linearly with depth from the fluid weight above. The tool returns both the gauge value and the total with atmosphere included.

  1. 1

    Enter depth

    Give the depth below the surface in meters, like 10.

  2. 2

    Enter fluid density

    Use 1000 kg/m3 for fresh water or 1025 for seawater.

  3. 3

    Enter surface pressure

    Keep 101325 Pa for atmosphere or 0 for gauge only.

FAQs

What is the pressure 10 meters under fresh water?

Gauge = 1000 x 9.81 x 10 = 98,100 Pa, and total adds atmosphere for 199,425 Pa — about 2 bar.

How much does seawater add compared to fresh?

At 10 m, 1025 kg/m3 gives 100,553 Pa gauge — roughly 2,450 Pa more than fresh water.

Why does every 10 meters add about one atmosphere?

Water weight stacks: 1000 x 9.81 x 10 = 98.1 kPa, close to the 101.3 kPa atmospheric standard.

What is gauge versus total pressure?

Gauge excludes the surface pressure term; total adds it, so the same 5 m depth reads 49,050 Pa gauge but 150,375 Pa total.

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