Convert Newtons per Square Millimetre to Inches of Water
1 newton per square millimetre (N/mm²) = 4014.63076 inches of water (inH₂O). 1 inH₂O = 0.00024908891 N/mm². Example: 15 N/mm² = 15 × 4014.63076 = 60219.4614 inH₂O.
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1 N/mm² = 4014.63076 inH₂O
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk newton per square millimetre to inch of water converter to paste a column from Excel.
How to Convert Newton per Square Millimetre to Inch of Water
- 1 N/mm² = 4014.63076 inH₂O
- 1 inH₂O = 0.00024908891 N/mm²
- Example: convert 15 N/mm² to inH₂O: 15 N/mm² = 15 × 4014.63076 inH₂O = 60219.4614 inH₂O
Reference conditions. inH₂O: Conventional water column: ρ = 1000 kg/m³ and gₙ = 9.80665 m/s² (≈ water at 4 °C).
Formula
inH₂O = N/mm² × 4014.630759756
Derivation from SI units:
- 1 N/mm² = 1 N ÷ 10⁻⁶ m² = 10⁶ Pa = 1 MPa
- 1 inH₂O = 1000 kg/m³ × 9.80665 m/s² × 0.0254 m = 249.08891 Pa
- 1 N/mm² = 1000000 Pa ÷ 249.08891 Pa per inH₂O = 4014.630759756 inH₂O
Both units are defined exactly, so the factor is exact. Newton per Square Millimetre definition: newton per square millimetre; Inch of Water definition: inch of water.
Worked examples
- A reading of 30 N/mm² converts to 120438.9228 inH₂O.
30 N/mm² × 4014.63076 = 120438.9228 inH₂O - A value of 275 N/mm² is 1104023.459 inH₂O.
275 N/mm² × 4014.63076 = 1104023.459 inH₂O
Newton per Square Millimetre to Inch of Water conversion table
| Newtons per Square Millimetre (N/mm²) | Inches of Water (inH₂O) |
|---|---|
| 1 N/mm² | 4014.63076 inH₂O |
| 10 N/mm² | 40146.3076 inH₂O |
| 20 N/mm² | 80292.6152 inH₂O |
| 25 N/mm² | 100365.769 inH₂O |
| 30 N/mm² | 120438.9228 inH₂O |
| 40 N/mm² | 160585.2304 inH₂O |
| 100 N/mm² | 401463.076 inH₂O |
| 235 N/mm² | 943438.2285 inH₂O |
| 275 N/mm² | 1104023.459 inH₂O |
| 355 N/mm² | 1425193.92 inH₂O |
| 400 N/mm² | 1605852.304 inH₂O |
| 500 N/mm² | 2007315.38 inH₂O |
| 1000 N/mm² | 4014630.76 inH₂O |
Where it's used
Newtons per Square Millimetre are used for steel yield and tensile strength (S355: 355 N/mm²), while inches of water appear in HVAC total external static pressure (residential ≈ 0.5 inH₂O). Both measure pressure, stress and differential pressure (force per unit area), so the conversion is a fixed factor.
Newton per Square Millimetre to other pressure units
| Conversion | 1 N/mm² equals |
|---|---|
| newton per square millimetre to inch of water | 4014.63076 inH₂O |
| newton per square millimetre to pascal | 1000000 Pa |
| newton per square millimetre to kilopascal | 1000 kPa |
| newton per square millimetre to ksi | 0.1450377377 ksi |
| newton per square millimetre to kilogram-force per square centimetre | 10.19716213 kgf/cm² |
| newton per square millimetre to psi | 145.0377377 psi |
| newton per square millimetre to bar | 10 bar |
| newton per square millimetre to millimeter of mercury | 7500.615758 mmHg |
Show 12 more units
| newton per square millimetre to atmosphere | 9.869232667 atm |
|---|---|
| newton per square millimetre to megapascal | 1 MPa |
| newton per square millimetre to gigapascal | 0.001 GPa |
| newton per square millimetre to kilogram-force per square millimetre | 0.1019716213 kgf/mm² |
| newton per square millimetre to millibar | 10000 mbar |
| newton per square millimetre to torr | 7500.616827 Torr |
| newton per square millimetre to millimeter of water | 101971.6213 mmH₂O |
| newton per square millimetre to centimeter of water | 10197.16213 cmH₂O |
| newton per square millimetre to inch of mercury | 295.299833 inHg |
| newton per square millimetre to decibar | 100 dbar |
| newton per square millimetre to inch of water (60 °F) | 4018.64652 inH₂O (60 °F) |
| newton per square millimetre to barye | 10000000 Ba |
Frequently asked questions
How many inches of water are in 1 newton per square millimetre?
1 N/mm² = 4014.63076 inH₂O.
How do I convert newtons per square millimetre to inches of water?
Multiply the value in N/mm² by 4014.63076. For example, 15 N/mm² × 4014.63076 = 60219.4614 inH₂O.
Is the N/mm² to inH₂O conversion exact?
Yes. Both units are defined exactly, so the ratio is exact; its decimal form does not terminate and is shown here to 10 significant figures (more with the precision selector).
Sources
- The International System of Units (SI), 9th edition (SI Brochure), Bureau International des Poids et Mesures , Table 4, coherent derived units with special names.
- Guide for the Use of the International System of Units (SI), NIST Special Publication 811, 2008 Edition, National Institute of Standards and Technology , Appendix B.8, "inch of water, conventional (inH2O)".
Last reviewed: . Factors are stored exactly and computed with 50-digit decimal arithmetic. See how we verify conversion factors.
Cite this page
APA
Scientific Converters. (2026, October 15). Convert Newtons per Square Millimetre to Inches of Water. Retrieved October 25, 2026, from https://scientificconverters.com/pressure/newton-per-square-millimeter-to-inch-of-water/
IEEE
Scientific Converters, "Convert Newtons per Square Millimetre to Inches of Water," scientificconverters.com. Accessed: Oct. 25, 2026. [Online]. Available: https://scientificconverters.com/pressure/newton-per-square-millimeter-to-inch-of-water/