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Converters & Notation

Unit Converter

Enter a value and choose the unit you have and the unit you want. The converter shows the exact factor and the multiplication, or the two-stage formula for temperature.

Updated October 3, 2026Written and reviewed by Mateuss M.Method: how we calculate

Value

From

To

Try an example:

Answer1 mi = 1.609344 km

1 mi = 1.609344 km

Step-by-step working 2 steps

1
Find the conversion factor
```
1 mi = 1.609344 km
```
Both units are converted through a common base (metre).
2
Multiply
```
1 × 1.609344 = 1.609344
```

How to use the unit converter

Enter the value.
Choose the From unit and the To unit (same type).
Read the result and the factor.
Swap the units to convert back.

Key factors

1 in = 2.54 cm (exact)
1 mi = 1.609344 km (exact)
1 lb = 0.45359237 kg (exact)
°F = °C × 9/5 + 32
K = °C + 273.15

US gallons, quarts, cups and fluid ounces are used here, not imperial ones.

Worked examples

Each example below is generated by the same calculator you used above, so the working always matches the answer.

1 mile → km

Answer1 mi = 1.609344 km

1 mi = 1.609344 km

Step-by-step working 2 steps

1
Find the conversion factor
```
1 mi = 1.609344 km
```
Both units are converted through a common base (metre).
2
Multiply
```
1 × 1.609344 = 1.609344
```

100 °C → °F

Answer100 °C = 212 °F

Step-by-step working 2 steps

1
Convert to Celsius first
```
100 °C
```
2
Convert Celsius to °F
```
100 × 9/5 + 32 = 212 °F
```

5 lb → kg

Answer5 lb = 2.26796185 kg

1 lb = 0.45359237 kg

Step-by-step working 2 steps

1
Find the conversion factor
```
1 lb = 0.45359237 kg
```
Both units are converted through a common base (kilogram).
2
Multiply
```
5 × 0.45359237 = 2.26796185
```

2 gal → L

Answer2 gal = 7.57082357 L

1 gal = 3.785411784 L

Step-by-step working 2 steps

1
Find the conversion factor
```
1 gal = 3.785411784 L
```
Both units are converted through a common base (litre).
2
Multiply
```
2 × 3.785411784 = 7.57082357
```

Common mistakes to avoid

Mixing unit types

You cannot convert kilograms to litres; the converter asks you to pick matching types.

Confusing US and imperial gallons

They differ by about 20%. This tool uses US gallons.

Converting temperature with a factor only

Celsius and Fahrenheit have different zero points, so you must also add or subtract 32.

Frequently asked questions

Are the factors exact?

Inch, mile, pound and the US volume units are defined exactly in terms of metric units; results are shown to 8 significant decimals.