Engineering Units
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Engineering unit conversion
Enter values, then press Calculate.
Base units: Pa for pressure, N for force, m/s for speed. Approximate conversion.
How to use
- Under kind, choose pressure, force, or speed. Default is pressure.
- Enter a value and unit. Changing kind switches the unit list to that quantity.
- Press Convert, or change value, kind, or unit, to see the other units of the same kind.
- Pressure is based on Pa, force on N, speed on m/s.
- Reset returns to pressure and value 1. For certification and calibration use official conversion tables.
Key concepts
Engineering unit conversion moves between SI and imperial/US customary within one physical quantity. Pressure: Pa, kPa, MPa, bar, atm, psi, mmHg. 1 atm = 101325 Pa, 1 bar = 10^5 Pa, 1 psi ≈ 6894.76 Pa, 1 mmHg ≈ 133.322 Pa. Force: N, kN, kgf, lbf, dyn, with 1 kgf = 9.80665 N. Changing kind refills the unit select from scratch while keeping the value. Switching from pressure to speed also changes what the number means—re-enter the value. The table shows only the chosen kind; force and pressure are not mixed on one screen.
Speed: m/s, km/h, mph, knot, ft/s. 1 km/h = 1/3.6 m/s, 1 knot ≈ 0.514444 m/s. Length, weight, and power are not in this kind—use dedicated converters. Display is a reference decimal and may differ from legal metrology rounding. Tires and hydraulics often use psi and bar; labs use Pa and kPa. kgf is shop convention; N is SI. Knots match aviation and marine logs. Reference decimals can differ from a certificate’s significant figures.
Example
1 atm is 101325 Pa, 101.325 kPa, about 14.696 psi, and close to 760 mmHg. Force 9.80665 N is 1 kgf. Speed 100 km/h is about 27.778 m/s, 62.137 mph, 53.996 knot. To convert tire psi to kPa, pick pressure. 32 psi is about 220.6 kPa, 2.206 bar. 1000 N is about 101.97 kgf, 224.8 lbf. 10 m/s is 36 km/h, about 19.44 knot.
Related: Length converter · Power unit converter
Frequently asked questions
Do I choose pressure, force, or speed?
Yes. The kind select splits physical quantities and the unit list follows. Only one kind converts at a time, so you cannot view pressure and force together. Pick the quantity you need first.
Are Pa, bar, atm, psi, and mmHg conversions exact?
Common engineering factors are used. 1 atm = 101325 Pa, 1 bar = 100000 Pa. Weather or medical mercury columns can differ by a digit. Weather hPa is kPa × 10 in place value: 1013 hPa is 101.3 kPa, about 1 atm.
Can I convert N, kgf, and lbf?
Yes. Kilogram-force (kgf), pound-force (lbf), and dyne (dyn) are included. They are not mass in kg. Dynes are old CGS and small; SI reports are better in N.
How do km/h, mph, and knot convert?
All are gathered to m/s then divided. Knot uses about 0.514444 m/s, close to the nautical-mile-per-hour definition. Use the mph row for miles per hour and the knot row for aircraft speed. This is separate from length-in-miles conversion.
Can this tool do length and weight?
No. Use length, weight, and power converters. mm, kg, and W belong there. This page is pressure, force, and speed only.
Can I use it for certified precision measurement?
It is for reference. Calibration and test certificates should follow accredited tables and significant figures. This table’s decimals may be longer than a certificate—follow the certificate at work.
Last reviewed: 2026-09-04