Contents

- Dead weight tester mass and area to pressure calculator
- Local gravity calculator
- Convert mass to different units
- Convert pressure to different units
- Calculate circle area from diameter
- Calculate circle diameter from area

## User Guide

This online tool will calculate the required mass to be added to a dead weight tester pressure calibrator by entering the target pressure, the effective area of the piston-cylinder and the local gravity.

### Formula

The formula used by this calculator to determine the required mass to be added to the dead weight tester is:

F = P·A

F = m·g

m = F/g

m = P·A/g

#### Symbols

- P = Pressure
- F = Force
- A = Area
- m = Mass
- g = Acceleration due to gravity

### Target Pressure (P)

Enter the target pressure required by the dead weight tester for calibration purposes.

### Effective Area (A)

Enter the effective area which you should find in the manufacturer’s documentation or instrument labelling.

### Local Gravity (g)

Enter the acceleration due to gravity for your geographical location in metres per second per second (ms^{-2}). The local gravity is dependent on several factors such as latitude, height above sea-level, local geological density, etc… Refer to your national geological survey data for your location or use this local gravity calculator to determine a close approximation. The default value is set to 9.80665 ms^{-2} which is standard gravity.

### Required Mass (m)

This is the total mass of weights that need to be added to a dead weight tester with the specified effective area & local gravity to generate the target pressure .