How do I convert bar to psi?
Multiply the pressure in bar by 14.5038. So 1 bar is about 14.5 psi, and a typical sealed-system charge of 1.5 bar is about 21.8 psi. To go the other way, divide psi by 14.5038.
Unit Converter for Tradespeople
Conversion
Result–
Guidance only — always verify against current standards and manufacturer instructions.
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This converter handles the unit conversions that come up daily in plumbing, heating, gas and electrical work: bar to psi, kW to BTU/h, litres per minute to UK gallons per minute, Celsius to Fahrenheit and metres to feet — each in both directions.
It is built for the situations where paperwork and equipment do not agree. Boiler outputs quoted in kW against radiator tables in BTU/h, pressure gauges marked in psi against system specs in bar, or flow rates in litres per minute against older documentation in gallons.
Pick the conversion from the list, enter your value, and the result appears immediately to three decimal places with the correct unit.
How to use it
- 1
Choose the conversion
Select the conversion you need from the list — for example bar → psi, kW → BTU/h or °C → °F. Every pair is available in both directions.
- 2
Enter the value
Type the number you want to convert in the value field, in the starting unit. For example, enter 1.5 with bar → psi selected to convert 1.5 bar.
- 3
Read the result
The converted value is shown to three decimal places with its unit — 1.5 bar comes out as 21.756 psi.
Guidance & standards
The conversion factors used are the standard ones for trade work: 1 bar = 14.5038 psi, 1 kW = 3,412.14 BTU/h, 1 L/min = 0.219969 UK gal/min and 1 m = 3.28084 ft. Temperature uses °F = °C × 1.8 + 32. Note that the gallon conversion is for imperial (UK) gallons, not US gallons — a US gallon is smaller, so American equipment specs will not match.
Typical uses: converting a boiler or stove output in kW to BTU/h when sizing radiators, converting a system pressure spec in bar to a psi gauge reading, or converting flow rates when commissioning against older imperial documentation.
Results are rounded to three decimal places, which is more precision than most site work needs. Round sensibly for the job in hand, and always sanity-check converted figures against manufacturer instructions before relying on them.
Frequently asked questions
How do I convert kW to BTU/h?
Multiply kilowatts by 3,412.14. A 24 kW boiler is therefore about 81,891 BTU/h. This is the conversion you need when matching a boiler or stove output in kW to radiator outputs quoted in BTU.
Is this converter using UK or US gallons?
UK (imperial) gallons. 1 litre per minute is 0.219969 UK gallons per minute. A US gallon is smaller (about 3.785 litres against 4.546 for a UK gallon), so figures from US equipment will not match this conversion.
How do I convert Celsius to Fahrenheit?
Multiply the Celsius figure by 1.8 and add 32. So 60°C — a common cylinder storage temperature — is 140°F. To convert Fahrenheit back to Celsius, subtract 32 and divide by 1.8.
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