Fast, free, and instant — convert Length, Weight, Temperature, Time & Speed right in your browser. No sign-up required.
Kilometer (km)
Meter (m)
1 km = 1000 m
Quick Conversions
How to use
This universal unit converter is a high-performance, client-side utility built to perform instantaneous, mathematically precise conversions between standard metric and imperial systems. Grounded in internationally recognized physical definitions, our converter eliminates formatting friction for engineers, travelers, students, and professionals alike.
To guarantee absolute privacy and security, all computation runs 100% locally in your browser. No inputs or values are ever transmitted to external servers or logged. The utility leverages a **Unified Base-Unit Architecture**: each unit is mapped to a specific category base multiplier (e.g., meters for length, kilograms for mass/weight, seconds for time, and meters per second for speed). Temperature scales, being affine transformations rather than simple scalar ratios, are processed via non-linear formulas utilizing Kelvin as the absolute reference base.
Understanding the underlying mathematics is crucial for ensuring accuracy in manual calculations. Here are the exact formulas used by our conversion engine:
Temperature conversions are non-linear because their zero-points do not align:
All linear distances are converted to meters (m) first, then converted to the target unit:
Conversions use the standard international avoirdupois definitions:
Velocity conversions relate to the base unit of meters per second (m/s):
To convert 10 kilometers into miles:
To convert 150 pounds into kilograms:
To convert 98.6 degrees Fahrenheit to Celsius:
Use these comparative reference grids to quickly look up common conversion factors across metric and imperial systems:
| From Unit | To Unit | Multiplier |
|---|---|---|
| Inches (in) | Centimeters (cm) | 2.54 |
| Feet (ft) | Meters (m) | 0.3048 |
| Yards (yd) | Meters (m) | 0.9144 |
| Miles (mi) | Kilometers (km) | 1.609344 |
| Kilometers (km) | Miles (mi) | 0.621371 |
| From Unit | To Unit | Multiplier |
|---|---|---|
| Grams (g) | Ounces (oz) | 0.035274 |
| Ounces (oz) | Grams (g) | 28.34952 |
| Pounds (lb) | Kilograms (kg) | 0.453592 |
| Kilograms (kg) | Pounds (lb) | 2.204623 |
| Metric Tonnes (t) | Kilograms (kg) | 1,000 |
| Reference Point | Celsius | Fahrenheit |
|---|---|---|
| Water Freezes | 0°C | 32°F |
| Normal Body Temp | 37°C | 98.6°F |
| Water Boils | 100°C | 212°F |
| Oven Baking Temp | 180°C | 356°F |
| Absolute Zero | -273.15°C | -459.67°F |
| From Unit | To Unit | Multiplier |
|---|---|---|
| Meters per sec (m/s) | km/h | 3.6 |
| Miles per hour (mph) | km/h | 1.609344 |
| Knots (kt) | km/h | 1.852 |
| Hours (hr) | Seconds (s) | 3,600 |
| Days (d) | Seconds (s) | 86,400 |