what does this symbol mean?
ISO 3758 A washtub with wavy water line and the number 30 inside

Machine wash, 30°C

The item can be washed in water up to 30°C (86°F) on a normal cycle.

How to read it

The number in the washtub is the highest water temperature allowed, in degrees Celsius, and the tub symbol covers washing by machine and by hand. No bar under the tub means the normal cycle. The same tub with one bar underneath calls for a mild cycle, and with two bars a very mild one.

Also searched as: 30 degree wash, washtub 30.

Where a garment's own label or its manufacturer says otherwise, that takes precedence.

Differences by country or standard

The Canadian government's guide, based on the Canadian care labelling standard, marks water temperature with dots in the tub instead of a number: one dot for 30°C, two for 40°C, four for 60°C. The temperature limits are the same.

Japan's switch in 2016

Japan used its own care symbols, under the standard JIS L 0217, until 1 December 2016. Since then labels there follow JIS L 0001, which brings them into line with the international symbols of ISO 3758; according to CINET, an international textile care association, the number of care symbols in use in Japan went from 22 to 41. Japan's Household Goods Quality Labeling Act requires textile goods to carry their care information as JIS L 0001 prescribes.

More laundry symbols

The same shape elsewhere

Sources

Researched, edited and approved by Rory Hansen before publishing. Last reviewed September 24, 2026. How we research

Added .

Report a problem

Please don’t include personal details.