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PSI to Bar Calculator

Convert pressure from PSI to bar for European fittings, valves and pressure ratings.

Computed in your browser — nothing you enter is uploaded. Figures are presented for United States against IRC 2024, and every formula is cited under regulatory standards below.

Last verified 2026-08-26 · v1.0.0

Market
Imperial · sales tax

Pressure

4.14 bar

High confidence

1 psi = 0.0689476 bar; 1 bar is defined as exactly 100,000 Pa. Check whether the rating is gauge or absolute — they differ by about 14.7 psi, which dominates a low-pressure system.

Conversion factor applied
0.07 bar per psi

Plumbing components sourced across markets carry pressure ratings in different units, so a European valve rated in bar has to be checked against a system measured in psi. The conversion is exact, and the two things that go wrong sit either side of it. The first is the gauge-versus-absolute distinction: nearly all plumbing ratings are gauge, measured above atmospheric, and treating an absolute figure as gauge shifts everything by about 14.7 psi — negligible on a high-pressure hydraulic circuit and dominant on a low-pressure gas or water system. The second is the casual equivalence of bar and atmospheres, which are about 1.3 percent apart and only interchangeable in conversation.

Add the equipment this sizes

This result is a specification — 4.137 bar — not a quantity. Put the thing it sizes into your project: how many, what you call it, and your supplier’s price.

Preliminary estimate, not certified engineering. This tool produces an indicative quantity calculation for planning purposes only — it is not a certified structural analysis, a guaranteed material takeoff, or a substitute for building department approval. Always verify measurements on-site and have a licensed contractor or structural engineer review any load-bearing, code-sensitive, or safety-critical work before purchasing materials or starting construction. Spotted an arithmetic or standards error? Report it to contact@craftquantities.com with your inputs — confirmed fixes become pinned regression tests.

[Schema Verified] Computed in alignment with American Concrete Institute (ACI 318-19) formulas and International Residential Code (IRC 2024) spatial boundaries.

Regulatory standards & verification citations

  • 1 bar = 100,000 Pa exactly; 1 psi = 6,894.757293 Pa, so 1 psi = 0.0689476 bar

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Frequently asked questions

Is bar the same as atmospheres?
Almost, but not exactly. One bar is 100,000 pascals; one standard atmosphere is 101,325 pascals, about 1.3% higher. The two are often used loosely as equivalents, which is fine for rough work and wrong for anything specified tightly.
Gauge or absolute pressure?
Most plumbing and pneumatic ratings are gauge — measured above atmospheric — and are sometimes written barg or psig. Absolute pressure includes atmospheric and is about 14.7 psi higher. Mixing them up on a low-pressure system is a large proportional error.
What is typical mains water pressure?
In a house, commonly 40 to 80 psi, which is roughly 2.8 to 5.5 bar. Many appliances and fittings specify a maximum inlet pressure, and a pressure-reducing valve is often needed where the main runs high.