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Water Pressure at Depth Calculator.

Calculate hydrostatic gauge and absolute pressure at a specified depth.

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Set your values

Results update as you type.

02 / ANSWER

Fluid density

Depth

Gravity

Atmospheric pressure

Gauge pressure

0.000000Pa

Absolute pressure

0.000000Pa

Results update automatically as you type.

Use Cases

Scuba Diving and Underwater Engineering

Determine the pressure experienced at a given depth to plan equipment ratings or understand physiological effects.

Example: At 30 m depth in seawater (density 1025 kg/m³), gauge pressure is about 301 kPa.

Designing Submersibles and Underwater Structures

Calculate the external pressure on hulls, pipelines, or sensors to ensure they can withstand the environment.

Example: For a depth of 100 m in freshwater, absolute pressure is about 1.08 MPa.

Frequently Asked Questions

What is the difference between gauge and absolute pressure?: Gauge pressure is the pressure relative to atmospheric pressure, calculated as fluid density × gravity × depth. Absolute pressure is gauge pressure plus atmospheric pressure, representing the total pressure including the atmosphere above the fluid.
How do I use the Water Pressure at Depth Calculator?: Enter the fluid density (kg/m³), depth (m), gravity (m/s²), and atmospheric pressure (Pa). The calculator will compute both gauge and absolute pressure. For water, use 1000 kg/m³, 9.81 m/s², and 101325 Pa for standard conditions.
What units are used for pressure in this calculator?: Pressure is calculated in Pascals (Pa). You can convert to other units like bar or psi manually if needed. The calculator uses SI units for all inputs: kg/m³, m, m/s², and Pa.

Tips & Common Mistakes

Tips

Use the correct fluid density: freshwater is about 1000 kg/m³, seawater about 1025 kg/m³.
Standard gravity is 9.81 m/s², but adjust for local variations if needed.
Atmospheric pressure at sea level is typically 101325 Pa; use 0 for gauge pressure only.
Double-check units: ensure density is in kg/m³, depth in meters, and gravity in m/s².

Common Mistakes to Avoid

Forgetting to add atmospheric pressure when calculating absolute pressure.
Using incorrect fluid density, such as using 1000 kg/m³ for seawater.
Mixing units, like entering depth in feet or pressure in psi without conversion.

Last updated: August 13, 2026

Use Cases

Scuba Diving and Underwater Engineering

Determine the pressure experienced at a given depth to plan equipment ratings or understand physiological effects.

Example: At 30 m depth in seawater (density 1025 kg/m³), gauge pressure is about 301 kPa.

Designing Submersibles and Underwater Structures

Calculate the external pressure on hulls, pipelines, or sensors to ensure they can withstand the environment.

Example: For a depth of 100 m in freshwater, absolute pressure is about 1.08 MPa.

Frequently Asked Questions

What is the difference between gauge and absolute pressure?

Gauge pressure is the pressure relative to atmospheric pressure, calculated as fluid density × gravity × depth. Absolute pressure is gauge pressure plus atmospheric pressure, representing the total pressure including the atmosphere above the fluid.

How do I use the Water Pressure at Depth Calculator?

Enter the fluid density (kg/m³), depth (m), gravity (m/s²), and atmospheric pressure (Pa). The calculator will compute both gauge and absolute pressure. For water, use 1000 kg/m³, 9.81 m/s², and 101325 Pa for standard conditions.

What units are used for pressure in this calculator?

Pressure is calculated in Pascals (Pa). You can convert to other units like bar or psi manually if needed. The calculator uses SI units for all inputs: kg/m³, m, m/s², and Pa.

Tips & Common Mistakes

Tips

Use the correct fluid density: freshwater is about 1000 kg/m³, seawater about 1025 kg/m³.
Standard gravity is 9.81 m/s², but adjust for local variations if needed.
Atmospheric pressure at sea level is typically 101325 Pa; use 0 for gauge pressure only.
Double-check units: ensure density is in kg/m³, depth in meters, and gravity in m/s².

Common Mistakes to Avoid

Forgetting to add atmospheric pressure when calculating absolute pressure.
Using incorrect fluid density, such as using 1000 kg/m³ for seawater.
Mixing units, like entering depth in feet or pressure in psi without conversion.

Use Cases

Scuba Diving and Underwater Engineering

Determine the pressure experienced at a given depth to plan equipment ratings or understand physiological effects.

Example: At 30 m depth in seawater (density 1025 kg/m³), gauge pressure is about 301 kPa.

Designing Submersibles and Underwater Structures

Calculate the external pressure on hulls, pipelines, or sensors to ensure they can withstand the environment.

Example: For a depth of 100 m in freshwater, absolute pressure is about 1.08 MPa.

Frequently Asked Questions

What is the difference between gauge and absolute pressure?

How do I use the Water Pressure at Depth Calculator?

What units are used for pressure in this calculator?

Pressure is calculated in Pascals (Pa). You can convert to other units like bar or psi manually if needed. The calculator uses SI units for all inputs: kg/m³, m, m/s², and Pa.

Tips & Common Mistakes

Tips

Use the correct fluid density: freshwater is about 1000 kg/m³, seawater about 1025 kg/m³.
Standard gravity is 9.81 m/s², but adjust for local variations if needed.
Atmospheric pressure at sea level is typically 101325 Pa; use 0 for gauge pressure only.
Double-check units: ensure density is in kg/m³, depth in meters, and gravity in m/s².

Common Mistakes to Avoid

Forgetting to add atmospheric pressure when calculating absolute pressure.
Using incorrect fluid density, such as using 1000 kg/m³ for seawater.
Mixing units, like entering depth in feet or pressure in psi without conversion.