Unit Converter — Free, Instant, 60+ Units
Convert between length, weight, temperature, speed, area, volume, data storage, and time units. Instant results, quick reference table, no login.
1 Kilometer (km) = 1000 Meter (m)
Quick Reference — Length
| From → To | Kilometer | Meter | Centimeter | Millimeter | Mile |
|---|---|---|---|---|---|
| Kilometer | 1 | 1000 | 100000 | 1000000 | 0.62137119 |
| Meter | 0.001 | 1 | 100 | 1000 | 0.00062137119 |
| Centimeter | 1.000000e-5 | 0.01 | 1 | 10 | 6.213712e-6 |
| Millimeter | 1.000000e-6 | 0.001 | 0.1 | 1 | 6.213712e-7 |
| Mile | 1.609344 | 1609.344 | 160934.4 | 1609344 | 1 |
About This Tool
60+ units across 8 categories
One converter for all your unit conversion needs. Switch between Length, Weight, Temperature, Speed, Area, Volume, Data Storage, and Time with a single click. All conversions use precise multipliers — temperatures use the exact °C ↔ °F ↔ K formula.
The quick reference table shows 1-unit equivalents for every unit pair in the selected category — useful for getting a feel for scale without typing values.
8 Categories
Length, Weight, Temp, Speed, Area, Volume, Data, Time.
Instant Results
Results appear as you type — no button to click.
Swap Button
Reverse the conversion direction in one click.
Reference Table
Full unit matrix for the active category.
High Precision
Up to 8 significant digits. Scientific notation for tiny/huge values.
100% Private
All calculations run in the browser. Nothing stored.
Categories
All Unit Categories
Length
km, m, cm, mm, mi, yd, ft, in
Weight
tonne, kg, g, mg, lb, oz
Temperature
°C, °F, K
Speed
km/h, m/s, mph, knot
Area
km², m², cm², ft², acre, ha
Volume
m³, L, mL, gallon, fl oz, cup
Data Storage
TB, GB, MB, KB, B
Time
year, month, week, day, h, min, s
FAQ
Frequently Asked Questions
Select Temperature, choose Celsius → Fahrenheit, and enter your value. The formula is °F = (°C × 9/5) + 32. Example: 100°C = 212°F.
Select Weight, choose Kilogram → Pound. 1 kg = 2.20462 lbs. Enter any value for the instant result.
Select Length, choose Kilometer → Mile. 1 km = 0.621371 miles. The reference table shows equivalents for all length unit pairs.
Select Data Storage, choose Gigabyte → Megabyte. 1 GB = 1024 MB (binary). Enter any value for instant conversion.
A 5×5 matrix showing what 1 unit of each type equals in every other unit in the category — useful for scale intuition without typing.
Yes. Free, no sign-up, no data stored, runs entirely in your browser.