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Unit converter

Convert engineering units without leaving the tab

The EngiRef unit converter is a free engineering converter covering 134 units across 16 categories, from pressure and torque to flow rate, including true-offset temperature conversion. Everything is computed in your browser, and any result can be kept in your calculation history.

Units
134
Constants
28

Tools

Every tool, on one page

EngiRef tools are free browser calculators for engineering work: a unit converter covering 134 units, a physical constants lookup and formula solving. Everything is computed in your browser with no account, and any result can be saved to your calculation history and exported.

Formula librarySaved results

Unit converter

0.001km

1 m = 0.001 km

Calculation history

Formula solver

Stress is force per unit area acting on a material

σ = 1 Pa (direct solve)

Every other variable is taken from the fields above; σ is what is being solved for.

\sigma = \frac{F}{A}

Constants lookup

Speed of Light in Vacuumc = 299792458 m/s
Planck Constanth = 6.62607e-34 J·s
Reduced Planck Constantℏ = 1.05457e-34 J·s
Elementary Chargee = 1.60218e-19 C
Avogadro's ConstantNᴀ = 6.02214e+23 1/mol
Gravitational ConstantG = 6.6743e-11 N·m²/kg²
Fine Structure Constantα = 0.00729735257
Vacuum Permittivityε₀ = 8.85419e-12 F/m

Formula references

The twelve most-reached-for equations. All 119 are in the formula library.

Normal Stress\sigma = \frac{F}{A}
Normal Strain\varepsilon = \frac{\Delta L}{L_0}
Hooke's Law\sigma = E \varepsilon
Shear Stress\tau = \frac{V}{A}
Torque\tau = F \cdot r
Moment of Inertia (Rectangle)I = \frac{bh^3}{12}
Moment of Inertia (Circle)I = \frac{\pi d^4}{64}
Newton's Second LawF = ma
Kinetic EnergyKE = \frac{1}{2}mv^2
Gravitational Potential EnergyPE = mgh
Power (Work/Time)P = \frac{W}{t}
Power (Rotational)P = \tau \omega

Common conversions

Straight to the pair you came for

Each one opens a page with the factor, a worked table and the conversion in reverse.

mm to cm

1 mm = 0.1 cm

Length

mm to m

1 mm = 0.001 m

Length

m² to ft²

1 m² = 10.7639104 ft²

Area

m² to in²

1 m² = 1550.0031 in²

Area

L to mL

1 L = 1000 mL

Volume

L to gal

1 L = 0.264172052 gal

Volume

kg to g

1 kg = 1000 g

Mass

kg to lb

1 kg = 2.20462262 lb

Mass

N to kN

1 N = 0.001 kN

Force

N to lbf

1 N = 0.224808943 lbf

Force

Pa to kPa

1 Pa = 0.001 kPa

Pressure

Pa to MPa

1 Pa = 1e-6 MPa

Pressure

°C to °F

°F = °C × 1.8 + 32

Temperature

°C to K

K = °C × 1 + 273.15

Temperature

J to kJ

1 J = 0.001 kJ

Energy

J to BTU

1 J = 0.00094781712 BTU

Energy

W to kW

1 W = 0.001 kW

Power

W to hp

1 W = 0.00134102209 hp

Power

m/s to km/h

1 m/s = 3.6 km/h

Speed

m/s to mph

1 m/s = 2.23693629 mph

Speed

m/s² to ft/s²

1 m/s² = 3.2808399 ft/s²

Acceleration

m/s² to g

1 m/s² = 0.101971621 g

Acceleration

kg/m³ to g/cm³

1 kg/m³ = 0.001 g/cm³

Density

kg/m³ to lb/ft³

1 kg/m³ = 0.0624279606 lb/ft³

Density

N·m to ft·lbf

1 N·m = 0.737562149 ft·lbf

Torque

N·m to in·lbf

1 N·m = 8.85074579 in·lbf

Torque

m³/h to L/s

1 m³/h = 0.277777778 L/s

Flow rate

m³/h to gpm

1 m³/h = 4.40286754 gpm

Flow rate

rad to °

1 rad = 57.2957795 °

Angle

rad to rev

1 rad = 0.159154943 rev

Angle