Pound per square inch to Newton per square millimeter 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 newtons per square millimeter [N/mm²] or newtons per square millimeter [N/mm²] 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.
Convert pounds per square inch to newtons per square millimeter
There are two simple ways to convert pounds per square inch [lb/in²] to newtons per square millimeter [N/mm²]. In the first calculation method, the value in pounds per square inch [lb/in²] is divided by the rounded conversion factor of 145.0377. The second method multiplies the value in pounds per square inch [lb/in²] by the rounded conversion factor of 0.0069.
- Newtons per square millimeter [N/mm²] ≈ pounds per square inch [lb/in²] ÷ 145.0377
- Newtons per square millimeter [N/mm²] ≈ pounds per square inch [lb/in²] * 0.0069
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 newtons per square millimeter [N/mm²] can be achieved using the following calculation method.
- Newtons per square millimeter [N/mm²] = pounds per square inch [lb/in²] * 45.359237 * 9.80665 ÷ 64,516
Convert newtons per square millimeter to pounds per square inch
Converting newtons per square millimeter [N/mm²] 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 newtons per square millimeter [N/mm²] is multiplied by the rounded conversion factor of 145.0377. The second variant is a division. Here, the value in newtons per square millimeter [N/mm²] is divided by the rounded conversion factor of 0.0069.
- Pounds per square inch [lb/in²] ≈ newtons per square millimeter [N/mm²] * 145.0377
- Pounds per square inch [lb/in²] ≈ newtons per square millimeter [N/mm²] ÷ 0.0069
However, rounded conversion values do not allow for exact calculations because rounding errors can occur in the calculation result. The most accurate conversion of newtons per square millimeter [N/mm²] to pounds per square inch [lb/in²] can be achieved using the following calculation method.
- Pounds per square inch [lb/in²] = newtons per square millimeter [N/mm²] ÷ 45.359237 ÷ 9.80665 * 64,516
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Pounds per square inch
Pascals
Pounds per square inch
Psi
Pounds per square inch
Standard atmospheres
Psi
Millimeters of mercury
Psi
Newtons per square millimeter
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