Bar to PSI Conversion

1 bar = 14.5038 psi. Bar and psi are the two pressure units you meet on site — pump curves and European gauges read bar, while pipe pressure ratings and many test gauges read psi. Convert any value below.

Bar to PSI chart

Tap (1 bar)

14.5

Tank 3 m up (0.3 bar)

4.4

Pump cut-out (3 bar)

43.5

Rain shower wants (1–2 bar)

~22

RO booster (7 bar)

101.5

CPVC pipe test (7 kg/cm²)

~100

1 bar = 14.5 psi. Note the gap between what a gravity tank delivers (4.4 psi) and what a rain shower needs (~22) — that's why so many expensive showers disappoint.

Pressures you actually meet on site

• Municipal water supply: 1–3 bar (15–44 psi) at the tap.
• Domestic pressure pump: cuts in ~1.5 bar, cuts out ~3 bar.
• CPVC pipe test: 7 kg/cm² ≈ 6.9 bar ≈ 100 psi held 24 hours before tiling — the standard plumbing acceptance test (plumbing checklist).
• RO booster pump: 6–8 bar.
• Car tyre: 2.1–2.5 bar (30–36 psi).

Note kg/cm² ≈ bar for site purposes (1 kg/cm² = 0.981 bar) — gauges marked in kg/cm² can be read as bar with ~2% error.

Frequently asked questions

How many psi is 1 bar? 1 bar = 14.5038 psi.

Is kg/cm² the same as bar? Nearly — 1 kg/cm² = 0.9807 bar. For site plumbing tests the two are used interchangeably.

What psi should a home water line be tested at? About 100 psi (7 kg/cm²) held for 24 hours with no drop, before walls are tiled or closed.

How many bar is atmospheric pressure? 1.013 bar (14.7 psi) at sea level — which is why "bar" is a convenient unit.

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