L Accepted alongside SI
Measures: Volume — how much space
Litre
The everyday volume unit — a big water bottle.
VolumeHow it's defined
Exactly one cubic decimetre (0.001 m³). Accepted for use with the SI; the big bottle of soda is two of these.
1 L = 1,000 mL = 0.001 m³ — exact
Convert — honestly
L equals
0.264172052 gal (US)
US gallon · factor exact — exact by definition (231 in³)
0.219969248 gal (imp)
Imperial gallon · factor exact — exact by definition (UK, 1985)
Conversions run through the litre using the stated factors — no rounding beyond display precision, and every factor says whether it's exact or measured.
Where you meet it
- Waterii-to-be — household water counts in these
- Fuel pumps and drink bottles worldwide
Other ways to measure volume
Source
This page is an authored summary of the authoritative definition — checkable one click away.
BIPM — The International System of Units (SI Brochure, 9th ed.)