Pound per square inch to Millimeter of water Converter (and vice versa)

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

This converter allows you to convert pounds per square inch [lb/in²] to millimeters of water [mmH₂O, mmWS] or millimeters of water [mmH₂O, mmWS] to pounds per square inch [lb/in²]. 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 pound per square inch [lb/in²] ≈ 703.0696 millimeters of water [mmH₂O, mmWS]1 millimeter of water [mmH₂O, mmWS] ≈ 0.0014 pounds per square inch [lb/in²]

Convert pounds per square inch to millimeters of water

There are two simple ways to convert pounds per square inch [lb/in²] to millimeters of water [mmH₂O, mmWS]. In the first calculation method, the value in pounds per square inch [lb/in²] is divided by the rounded conversion factor of 0.0014. The second method multiplies the value in pounds per square inch [lb/in²] by the rounded conversion factor of 703.0696.

  • Millimeters of water [mmH₂O, mmWS] ≈ pounds per square inch [lb/in²] ÷ 0.0014
  • Millimeters of water [mmH₂O, mmWS] ≈ pounds per square inch [lb/in²] * 703.0696

However, rounded conversion values are only suitable for rough conversions, as rounding errors can occur in the calculation result. The most accurate conversion of pounds per square inch [lb/in²] to millimeters of water [mmH₂O, mmWS] can be achieved using the following calculation method.

  • Millimeters of water [mmH₂O, mmWS] = pounds per square inch [lb/in²] * 4,535.9237 ÷ 6.4516

Convert millimeters of water to pounds per square inch

Converting millimeters of water [mmH₂O, mmWS] to pounds per square inch [lb/in²] is easy and can be done in two ways. The first method involves multiplication, in which the value in millimeters of water [mmH₂O, mmWS] is multiplied by the rounded conversion factor of 0.0014. The second variant is a division. Here, the value in millimeters of water [mmH₂O, mmWS] is divided by the rounded conversion factor of 703.0696.

  • Pounds per square inch [lb/in²] ≈ millimeters of water [mmH₂O, mmWS] * 0.0014
  • Pounds per square inch [lb/in²] ≈ millimeters of water [mmH₂O, mmWS] ÷ 703.0696

However, rounded conversion values do not allow for exact calculations because rounding errors can occur in the calculation result. The most accurate conversion of millimeters of water [mmH₂O, mmWS] to pounds per square inch [lb/in²] can be achieved using the following calculation method.

  • Pounds per square inch [lb/in²] = millimeters of water [mmH₂O, mmWS] ÷ 4,535.9237 * 6.4516

Converter

Decimal places

How it's calculated

Factor: 
≈ 703.07
Millimeters of water = Pounds per square inch * 4,535.9237 ÷ 6.4516
Pounds per square inch = Millimeters of water ÷ 4,535.9237 * 6.4516

To all available units

Pounds per square inch

Millipascals

Pounds per square inch

Newtons per square millimeter

Pounds per square inch

Pascals

Pounds per square inch

Psi

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