MasterTool

Pressure Calculator

Calculate pressure instantly in your browser — the published formula, worked locally with no data sent anywhere.

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What this tool does

Calculate pressure instantly in your browser — the published formula, worked locally with no data sent anywhere. Force mode assumes the force is spread evenly over the whole area. Hydrostatic pressure is gauge pressure (above atmospheric) in a static fluid and does not depend on the container's shape — only depth.

How to use the Pressure Calculator

  1. Enter or select mode.
  2. Enter or select force (weight) in lb.
  3. Enter or select area in sqft.
  4. Enter or select fluid density (kg/m³).
  5. Enter or select depth below the surface (m).
  6. Read the calculated result; change any measurement to compare alternatives.

Formula

Force mode: P = F/A (entered in lb and sq ft, reported in psf, psi and pascals). Hydrostatic mode: gauge pressure grows linearly with depth, P = ρ·g·h.
mode
Mode
forceLb
Force (weight) (lb, before metric conversion)
area
Area (sqft, before metric conversion)
rho
Fluid density (kg/m³)
depth
Depth below the surface (m)

Force mode assumes the force is spread evenly over the whole area. Hydrostatic pressure is gauge pressure (above atmospheric) in a static fluid and does not depend on the container's shape — only depth.

Worked example

For pressure calculator, the following measurements illustrate the exact method: Mode: force; Force (weight): 1000; Area: 10; Fluid density (kg/m³): 1000; Depth below the surface (m): 5.

Inputs

  • ModeForce over area (P = F/A)
  • Force (weight)1000 lb
  • Area10 sq ft
  • Fluid density (kg/m³)1000
  • Depth below the surface (m)5

Result

  • Pressure (psi)0.69
  • Pressure (lb/sq ft)100
  • Pressure (Pa)4,788.03
  • Pressure (kPa)4.79

Results explained

Pressure (psi)
Pressure (psi) from the formula above. Force mode assumes the force is spread evenly over the whole area. Hydrostatic pressure is gauge pressure (above atmospheric) in a static fluid and does not depend on the container's shape — only depth.
Pressure (lb/sq ft)
Pressure (lb/sq ft) from the formula above. Force mode assumes the force is spread evenly over the whole area. Hydrostatic pressure is gauge pressure (above atmospheric) in a static fluid and does not depend on the container's shape — only depth.
Pressure (Pa)
Pressure (Pa) from the formula above. Force mode assumes the force is spread evenly over the whole area. Hydrostatic pressure is gauge pressure (above atmospheric) in a static fluid and does not depend on the container's shape — only depth.
Pressure (kPa)
Pressure (kPa) from the formula above. Force mode assumes the force is spread evenly over the whole area. Hydrostatic pressure is gauge pressure (above atmospheric) in a static fluid and does not depend on the container's shape — only depth.

Frequently asked questions

Force mode: P = F/A (entered in lb and sq ft, reported in psf, psi and pascals). Hydrostatic mode: gauge pressure grows linearly with depth, P = ρ·g·h.

Force mode assumes the force is spread evenly over the whole area. Hydrostatic pressure is gauge pressure (above atmospheric) in a static fluid and does not depend on the container's shape — only depth.

Every field is labelled with its unit — enter values in exactly the labelled unit and read the result in the labelled output unit. Fields with a unit symbol also support the site-wide imperial/metric switch, which converts before the formula runs.

It uses double-precision arithmetic and the published constants and formulas named on this page. The last displayed digit may be rounded, and real conditions can differ from the idealized model described in the assumptions.

Yes. Every calculation runs entirely in your browser; nothing you enter is uploaded, stored or shared.