Manometer Calculator

Calculate pressure difference (ΔP) using a U-tube manometer liquid height.

Measurement Data

Manometer Liquid

Column Height Difference (h)

Local Gravity (g) [m/s²]

Results

Enter fluid height and properties to calculate

Overview

A manometer is a fundamental pressure measuring device. By observing the difference in height (h) between two columns of a known liquid, the pressure difference between the two sides of the tube can be calculated using the hydrostatic pressure formula.

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Pro Tips

Standard Earth gravity is 9.80665 m/s².
Density values change slightly with temperature; the values here are for room temperature (~20°C).
Mercury is commonly used for high pressures, while water or oil are used for small pressure differences.

Fun Facts

"Millimeters of Mercury (mmHg) is a unit of pressure derived directly from manometer measurements."
"Analog aircraft altimeters are essentially highly sensitive manometers that measure atmospheric pressure change with altitude."
"The first 'sphygmomanometer' (blood pressure cuff) used a vertical tube of mercury to measure the internal arterial pressure."

Formula: ΔP = ρ · g · h

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