12 Free Online Unit Converters for Students and Engineers
Twelve free unit converters cover everyday and engineering conversions: length, weight, temperature, area, volume, speed, time, bytes, pressure, power, voltage and torque. Type a value in either box and the result updates instantly in your browser.
The 12 converters
✓1. Length Converter
📏 mm, cm, m, km, inches, feet, yards, miles, nautical miles and more. Open Length Converter
2. Weight Converter
kg, g, lb, ounces, stones, tons, carats. Open Weight Converter
3. Temperature Converter
Celsius, Fahrenheit, Kelvin and Rankine. Open Temperature Converter
4. Area Converter
Square metres, square feet, acres, hectares. Open Area Converter
5. Volume Converter
Litres, millilitres, gallons, pints, cups. Open Volume Converter
6. Speed Converter
km/h, mph, m/s, knots. Open Speed Converter
7. Time Converter
Seconds, minutes, hours, days, weeks, years. Open Time Converter
8. Byte Converter
Bits, bytes, KB to EB and kilobits to exabits. Open Byte Converter
9. Pressure Converter
Pascal, kPa, bar, psi, atmospheres, mmHg. Open Pressure Converter
10. Power Converter
Kilowatts, megawatts, horsepower, BTU per hour and more. Open Power Converter
11. Voltage Converter
Microvolts, millivolts, volts, kilovolts and megavolts. Open Voltage Converter
12. Torque Converter
Newton-metres, pound-force feet and inches, kgf-metres. Open Torque Converter
Who uses what
| User | Most useful converters |
|---|---|
| Students | Length, weight, temperature, area |
| Cooks and bakers | Weight, volume, temperature |
| Travellers | Length (miles–km), speed, temperature |
| Engineers | Pressure, power, torque, voltage |
| IT and web | Byte converter, time |
Tips for accurate conversions
✓- Check whether a gallon, pint or ton is US or UK – they differ.
- Round only at the end, not in the middle of a calculation.
- For KB/MB/GB, confirm whether 1,000 or 1,024 is expected.
Open the Length Converter on pdfseotools.com – free, no sign-up and it works on any device.
Frequently Asked Questions
Are the unit converters free?
Yes. All twelve are free with no sign-up.
Do I need to press a button?
No. Results update instantly in your browser as you type in either box.
Which converter do students use most?
Length, weight, temperature and area cover most school and exam questions.
Is a KB 1,000 or 1,024 bytes?
Both conventions exist: storage makers use 1,000, while many operating systems use 1,024 (strictly a "KiB"). Check which one your task needs.
Do they work offline?
The page needs to load first; after that the maths runs in your browser.
Do I need to install software or create an account?
No. Everything runs in your web browser on Windows, Mac, Android and iPhone – there is nothing to download, nothing to install and no account to create.
Summary
Twelve instant converters, no sign-up. Bookmark the free unit converters page for homework, cooking, travel and engineering.
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