Free Unit Converter for Engineers & Everyday Use
Convert pressure, force, torque, length, weight, temperature and 12 more categories instantly — precise to 8 significant figures, no sign-up required.
Runs entirely in your browser — nothing you type is uploaded or stored.
Popular conversions
The most searched conversions, one click away
How to use the converter
Three steps. No account, no download, no waiting.
Choose a category
Pick the type of conversion you need — Pressure, Length, Force, Torque, Temperature and 12 more, covering both everyday and engineering units.
Enter your value
Type a number into the "From" box and select the unit you're converting from and the unit you want. The result updates instantly as you type.
Copy your result
Use the swap button to flip units instantly, or hit "Copy result" to grab the converted value for your report, spreadsheet or drawing.
An engineering-grade unit converter, built for accuracy
EngiConvert was built for people who need conversions to be exactly right — structural, mechanical and civil engineers checking stress values in ksi and MPa, students converting torque from lbf·ft to N·m, and anyone who just needs to know how many kilometers is 10 miles. Every conversion factor used on this page is an exact, published standard value (for example, 1 inch is defined as precisely 25.4 mm), and results are shown to 8 significant figures so you can trust the number whether you're filling in a spreadsheet or a stress report.
Engineering categories
Alongside the everyday conversions, EngiConvert covers the categories engineers reach for most often:
- Pressure / Stress — Pa, kPa, MPa, GPa, bar, psi, ksi, atm, mmHg, kgf/cm²
- Force — Newtons, kilonewtons, pound-force, kilogram-force, dyne
- Torque / Moment — N·m, lbf·ft, lbf·in, kgf·m
- Energy & Power — Joules, kWh, BTU, horsepower (mechanical and metric)
- Density — kg/m³, g/cm³, lb/ft³, slug/ft³
- Area Moment of Inertia — mm⁴, cm⁴, m⁴, in⁴, for structural section properties
Everyday categories
The same engine also covers the conversions everyone searches for: Length (km, miles, cm, inches, feet), Mass (kg, lbs, stone, ounces), Temperature (°C, °F, K), Area, Volume, Speed, Time and Angle.
| Category | Example units |
|---|---|
| Length | mm, cm, m, km, in, ft, yd, mi, nautical miles |
| Mass / Weight | mg, g, kg, tonnes, oz, lb, stone, US/UK tons |
| Temperature | °C, °F, K, °R |
| Pressure / Stress | Pa, kPa, MPa, GPa, bar, psi, ksi, atm, mmHg |
| Force | N, kN, lbf, kgf, ozf, dyne |
| Torque / Moment | N·m, kN·m, lbf·ft, lbf·in, kgf·m |
| Energy / Work | J, kJ, kWh, cal, BTU, ft·lbf |
| Power | W, kW, hp, metric hp, BTU/h |
| Density | kg/m³, g/cm³, lb/ft³, slug/ft³ |
| Area Moment of Inertia | mm⁴, cm⁴, m⁴, in⁴ |
Frequently asked questions
Is this unit converter free to use?
Yes. EngiConvert is completely free, with no registration, sign-up or account required. Just open the page and convert.
How accurate are the conversions?
Conversions use exact, industry-standard conversion factors (e.g. 1 inch = 25.4 mm exactly) and results are shown to 8 significant figures — accurate enough for engineering calculations as well as everyday use.
Can I convert engineering units like ksi to MPa or psi to bar?
Yes. The Pressure/Stress category covers Pa, kPa, MPa, GPa, bar, psi, ksi, atm, mmHg and kgf/cm², alongside dedicated categories for Force, Torque, Energy, Power, Density and Area Moment of Inertia.
Does the converter work on mobile phones?
Yes — the layout is fully responsive and the tool works the same way on phones, tablets and desktops.
Does my data get uploaded anywhere?
No. All calculations run locally in your browser using JavaScript. Nothing you type is sent to a server or stored.
Why do my results show many decimal places?
Results are shown to up to 8 significant figures so the value is precise enough for engineering use. Round it to the precision you need for your own calculation.
More conversions
Dedicated pages for the most popular conversion pairs