100% local and secure
Every conversion is calculated directly in your browser. Values you enter are never sent to our servers.
Universal converter
Instantly convert length, mass, temperature, volume and dozens of other units. Calculations run locally in your browser without uploading data.
- 100% local
- Instant
- Free
- No account
- Works offline
Choose a quantity, then enter a value in any field: every other value updates instantly.
Enter a value in any row to convert instantly.
Why use this tool?
Instantly convert everyday measurements, physical quantities, electricity and digital data in one interface. Enter a value in any row and every other displayed unit recalculates immediately.
Instant conversion
Change any value or unit and all other results recalculate immediately, with no submit button.
A truly universal converter
Length, mass, temperature, speed, energy, pressure, electricity, digital storage and many more quantities are available in one place.
Compare several units at once
Display several units simultaneously and add only the ones you need for your conversion.
Guide
How to use this tool
- 1
Choose the conversion type
Select the quantity to convert: length, mass, temperature, speed, energy, pressure, digital data or another available category.
- 2
Enter a value
Type a number in any field. That row becomes the reference and every other value recalculates instantly.
- 3
Choose your units
Use the selector on the right of each field to change its unit, then add a row if you want to compare another unit.
Tips and best practices
- You can use either a comma or a period as the decimal separator.
- Any row can become the source value: click the field you want and enter your number.
- For digital storage, decimal (MB, GB) and binary (MiB, GiB) units are listed separately.
Frequently asked questions
How do I convert a value?
Choose a conversion type, enter a value in any field, then select the units you want to display. Every other result updates automatically.
Can I enter my value in any unit?
Yes. Every field is editable. As soon as you change a value, that row becomes the reference used to recalculate the others.
Can I display more units?
Yes. Use “Add a unit” to display another unit, up to the number of units available for the selected quantity.
Are my values sent to a server?
No. Conversions run locally in your browser and the values you enter are not sent to our servers.
What is the difference between MB and MiB?
MB is decimal and equals 1,000,000 bytes. MiB is binary and equals 1,048,576 bytes.
Why do some conversions show several decimal places?
Some units do not have a simple decimal relationship. The converter keeps enough significant digits to provide an accurate result without rounding too early.
Was this tool useful?
Read next
TutorialBest practicesBeginner
Prepare a PDF before sending it: merge, reorder, compress and convert
A practical workflow for checking, merging, reordering, sanitizing, compressing and protecting a final PDF before sending it.
30 August 20263 minRead
GuideBest practicesBeginner
Convert a PDF to images or images to PDF
Learn what changes when PDF pages are rasterized, how resolution and image format affect quality, and when to assemble images into a PDF.
29 August 20262 minRead
GuideBest practicesBeginner
Convert CSV, Excel, JSON and TSV without losing the structure
Understand delimiters, encodings, types, nested JSON and spreadsheet features before converting data between CSV, Excel, JSON and TSV.
29 August 20262 minRead
GuideBest practicesBeginner
Convert FLAC to MP3: reduce audio file size
Create a smaller MP3 listening or sharing copy from a lossless FLAC source directly in the browser.
29 August 20261 minRead
Recommended workflow
Continue your processing
Discover tools that naturally fit before, after, or alongside this one.
Complementary tools
Mathematics & calculation
CM ↔ inches converter
Convert centimeters to inches instantly, or switch direction to convert inches to centimeters.
100% localNew
Use this toolMathematics & calculation
KG ↔ lbs converter
Convert kilograms to pounds (lb) instantly, or switch direction to convert pounds to kilograms.
100% localNew
Use this toolMathematics & calculation
MM ↔ inches converter
Convert millimeters to inches instantly, or switch direction to convert inches to millimeters.
100% localNew
Use this tool