Unit Converter
Convert length, mass, temperature, volume, area, speed, and data units in your browser.
1. Enter values
2. Result
Converted value
0.001
Meters
Kilometers
Length
3. Summary
How is it calculated?
Most categories multiply by a factor to a canonical unit, then to the target. Temperature is affine (not a simple ratio). Data labels follow this panel’s SI (1000) versus IEC (1024) convention.
Common use cases
Length
Meters, miles, inches, and other distance units.
Mass
Kilograms, pounds, and ounces for recipes or shipping.
Temperature
Celsius, Fahrenheit, and Kelvin with the affine formulas.
Volume
Liters, gallons, and cups for kitchen or lab notes.
Speed
Meters per second, mph, and knots.
Data size
Bytes, decimal MB, and binary MiB — read the labels.
Your data stays private
Unit math runs in this browser. Nothing is uploaded or stored on a server.
About converting units in the browser
Unit Converter switches length, mass, temperature, volume, area, speed, and data units locally. Factors are the usual SI and customary relationships used in general-purpose converters. Temperature is affine (not a simple multiply). Data units here are the convention the panel implements — SI (1000) versus IEC (1024) can disagree; read the labels.
This is not a lab-grade metrology tool and not a currency converter (that page fetches reference rates). BMI wants kg and cm or lb and in on its own page. Time Zone Converter is for clocks, not for converting seconds to hours in a duration sense beyond what this panel offers.
Related: Scientific Calculator, Percentage Calculator, BMI Calculator, Currency Converter, Time Zone Converter.
The URL is /tools/unit-converter. We do not convert survey feet, Troy ounces, or cooking cups with humidity. Read From and To labels twice for data units. Close the tab to drop the value. Currency Converter is the sibling when the unit is money. Homework and form-filling are the intended uses. A calibration lab needs certified instruments, not this tab.
How to convert units
Pick a category
Length, mass, temperature, volume, area, speed, or data — then From and To.
Enter the value
The converted amount updates in the panel. Temperature is not a simple ratio.
Copy if needed
Use the result in a form. This is planning math, not a calibration certificate.
Stay local
Nothing is uploaded. Currency Converter is the sibling when the unit is money.
Related tools
Scientific Calculator
Evaluate expressions with sin, cos, tan, log, and powers in your browser. Not a CAS.
Percentage Calculator
Calculate percentages easily. Find percentage of a number, increase/decrease, percentage difference and more.
BMI Calculator
Calculate body mass index from metric kilograms and centimeters or imperial pounds and inches. WHO-style adult categories appear with the index. Not medical advice.
Time Zone Converter
Convert a wall-clock date and time between IANA time zones, including DST on that calendar date. Search zones such as Asia/Ho_Chi_Minh. Nothing is uploaded.
Currency Converter
Convert an amount with a daily reference FX rate fetched in this browser. Click Convert — this is not a bank quote.
Unit Converter FAQ
Read the labels. SI (1000) and IEC (1024) disagree. Temperature is affine, not a simple multiply. This is not lab metrology.
No. Open Currency Converter for FX reference rates. BMI has its own metric/imperial page. Time Zone Converter is for clocks.
No. Unit math runs locally.
General-purpose SI and customary factors only. Read From and To labels twice for data units (1000 versus 1024). Temperature is affine. Currency Converter is the sibling when the unit is money. BMI has its own page. Close the tab to drop the value. This is planning math, not a calibration certificate. Nothing is uploaded.