Inch of water to Psi Converter (and vice versa)

Created by: tinycalcs.com/en
Number of supported units: 2
Last update: 2026

This converter allows you to convert inches of water [inH₂O] to psi or psi to inches of water [inH₂O]. Calculations are performed in both directions. The calculation result and the entered value are displayed with up to 20 decimal places for maximum accuracy.

1 inch of water [inH₂O] ≈ 0.0361 psi1 psi ≈ 27.7076 inches of water [inH₂O]

Convert inches of water to psi

There are two simple ways to convert inches of water [inH₂O] to psi. In the first calculation method, the value in inches of water [inH₂O] is divided by the rounded conversion factor of 27.7076. The second method multiplies the value in inches of water [inH₂O] by the rounded conversion factor of 0.0361.

  • Psi ≈ inches of water [inH₂O] ÷ 27.7076
  • Psi ≈ inches of water [inH₂O] * 0.0361

However, rounded conversion values are only suitable for rough conversions, as rounding errors can occur in the calculation result. The most accurate conversion of inches of water [inH₂O] to psi can be achieved using the following calculation method.

Psi = inches of water [inH₂O] * 1,605.416144 ÷ 4,535.9237 ÷ 9.80665

Convert psi to inches of water

Converting psi to inches of water [inH₂O] is easy and can be done in two ways. The first method involves multiplication, in which the value in psi is multiplied by the rounded conversion factor of 27.7076. The second variant is a division. Here, the value in psi is divided by the rounded conversion factor of 0.0361.

  • Inches of water [inH₂O] ≈ psi * 27.7076
  • Inches of water [inH₂O] ≈ psi ÷ 0.0361

However, rounded conversion values do not allow for exact calculations because rounding errors can occur in the calculation result. The most accurate conversion of psi to inches of water [inH₂O] can be achieved using the following calculation method.

Inches of water [inH₂O] = psi ÷ 1,605.416144 * 4,535.9237 * 9.80665

Converter

Decimal places

How it's calculated

Factor: 
≈ 27.708
Psi = Inches of water * 1,605.416144 ÷ 4,535.9237 ÷ 9.80665
Inches of water = Psi ÷ 1,605.416144 * 4,535.9237 * 9.80665

To all available units

Inches of water

Standard atmospheres

Kilobar

Decapascals

Kilobar

Gigapascals

Kilobar

Hectopascals

Kilobar

Kilopascals

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