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> Index of every page on this site: [llms.txt](https://methodcalculator.com/llms.txt)

# **Unit Converter**

Convert between metric and imperial units for length, weight, temperature, volume, area and speed, and see the same quantity expressed in every unit of the category at once.

## **Result**

Result

**1 km = 0.62137119 mi**

<dl>

<dt>Kilometers → Miles</dt>
<dd>**0.62137119**</dd>

<dt>1 km in mi</dt>
<dd>0.62137119</dd>

</dl>

**1 km in every length unit**

| **Unit** | **Value** |
| --- | --- |
| Millimeters (mm) | 1,000,000 |
| Centimeters (cm) | 100,000 |
| Meters (m) | 1,000 |
| Kilometers (km) | 1 |
| Inches (in) | 39,370.07874 |
| Feet (ft) | 3,280.839895 |
| Yards (yd) | 1,093.613298 |
| Miles (mi) | 0.62137119 |

## About this unit converter

Recipes, travel, DIY projects, shipping and school work constantly mix metric and imperial units. This converter covers the six categories people need most often: length, weight, temperature, volume, area and speed. Choose a category, type a number and pick the units; the result and a full table of equivalents update instantly.

## How the conversion is done

Each unit has a fixed ratio to a base unit. To convert, the value is multiplied by the source ratio and divided by the target ratio: **result = value × factor(from) ÷ factor(to)**.

**Example:** 1 kilometer to miles. The base unit for length is the meter: 1 km = 1,000 m and 1 mi = 1,609.344 m, so 1 km = 1,000 ÷ 1,609.344 = **0.621371 mi**. Temperature is the exception and uses offset formulas: °F = °C × 9⁄5 + 32, K = °C + 273.15.

## Conversion factors used

| Unit | Equals |
| --- | --- |
| 1 inch | 2.54 cm (exact) |
| 1 mile | 1.609344 km (exact) |
| 1 pound | 0.45359237 kg (exact) |
| 1 stone | 14 lb = 6.35029 kg |
| 1 US gallon | 3.785411784 L (exact); UK gallon 4.54609 L |
| 1 US cup | 8 US fl oz = 236.588 ml |
| 1 acre | 4,046.8564224 m² (exact); 640 acres = 1 mi² |
| 1 knot | 1.852 km/h (exact) |

## How to use this converter

- Select the category first; the unit lists change to match it and sensible default units are chosen.
- Use “Swap” to reverse the direction without retyping the value.
- The table under the result lists the value in every unit of the category, useful when you are not sure which unit a document uses.
- For height specifically, the [height converter](https://methodcalculator.com/height-converter) handles feet and inches together; for trip fuel economy in mpg or L/100 km see the [fuel cost calculator](https://methodcalculator.com/fuel-cost-calculator).

## **Frequently asked questions **

### **How does unit conversion work?**

Every unit in a category is defined as a multiple of one base unit (meters for length, kilograms for mass, liters for volume). A value is multiplied by its unit's factor to reach the base unit and divided by the target unit's factor. For example 1 mile is 1,609.344 m and 1 km is 1,000 m, so 1 mile = 1.609344 km.

### **Why is temperature different from the other categories?**

Celsius, Fahrenheit and Kelvin do not share a zero point, so a simple multiplier is not enough. The converter uses the exact formulas °F = °C × 9/5 + 32 and K = °C + 273.15, which is why 0 °C is 32 °F and −40 °C equals −40 °F.

### **Are US and UK gallons the same?**

No. A US gallon is 3.785 liters while an imperial (UK) gallon is 4.546 liters, about 20% larger. Cups, pints and fluid ounces also differ between the two systems; this converter uses US customary measures for those, and lists the UK gallon separately.

### **How accurate are the conversions?**

The factors are the exact legal definitions where one exists (1 in = 2.54 cm, 1 lb = 0.45359237 kg, 1 US gal = 3.785411784 L, 1 acre = 4,046.8564224 m²). Results are shown with up to six significant decimals, which is more than enough for everyday and engineering use.

## **Related calculators **

- [**Height Converter**](https://methodcalculator.com/height-converter)
- [**Area Calculator**](https://methodcalculator.com/area-calculator)
- [**Fuel Cost Calculator**](https://methodcalculator.com/fuel-cost-calculator)
- [**Pace Calculator**](https://methodcalculator.com/pace-calculator)

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