How to use this on a job
A dimension is the first check, before any arithmetic. A drawing in millimetres and a setup screen in inches describe length. A flow specification in litres per minute and one in cubic metres per hour describe volume per time. Keep like quantities together.
- 01
Choose the physical quantity, then its source and target units. The selectors only offer units from that same dimension.
- 02
Enter the value. Most conversions multiply by a scale factor; temperature also needs an offset. The calculation shows both directions so you can read the result back in the original unit.
- 03
Carry the unit into your PLC tag, HMI label or commissioning record. A correct number without its unit is still ambiguous.
Work through one example
target = (source × source factor + source offset − target offset) ÷ target factor
A roller drawing gives a 4-inch diameter. Converting it gives 101.6 mm, not 100 mm. Using 100 mm in a distance calculation creates roughly a 1.6% scale error before any encoder or gearbox error is considered. Use the measured working diameter when belt compression matters.
Before you trust the answer
Pressure conversion changes the unit, not the reference. A gauge pressure remains gauge pressure; converting it to absolute requires a separate atmospheric-pressure input. US gallons here are US liquid gallons. Mechanical horsepower is not metric horsepower. Torque and energy share dimensions but retain separate selectors because they describe different jobs.