What PA+++ actually means on Korean sunscreen

Korean sunscreen labels carry two ratings, and most English-language sunscreen advice only explains one of them. The plus signs are not decoration.

Why UVA needs its own rating

UVB and UVA are different parts of the spectrum and are filtered by different ingredients. A formula can be loaded with UVB filters and score a high SPF while offering much less UVA coverage, and nothing in the SPF number would reveal that.

Separate ratings exist precisely to close that gap. Korea and Japan use PA, Europe uses a circled UVA mark, and the US relies on broad spectrum labelling that is less granular than either.

The 50+ ceiling

Korean labels stop at SPF 50+ rather than printing higher numbers. Products testing above 50 are all labelled the same way, which is a deliberate decision to stop the numbers race from implying differences that do not translate into practice.

So an SPF 50+ PA++++ product is at the top of both scales as printed, and comparing it against another 50+ PA++++ product means comparing texture, filters and finish rather than ratings.

Which filters do which job

Avobenzone and diethylamino hydroxybenzoyl hexyl benzoate are UVA-oriented. Ethylhexyl methoxycinnamate and ethylhexyl triazone lean UVB. Zinc oxide covers a broad range. Formulators combine them to hit both ratings.

You do not have to work this out yourself, since the ratings are printed. It is useful when comparing two products with the same ratings but different filter sets, where photostability and texture become the deciding factors.

Ratings assume an amount nobody applies

Both SPF and PA are measured at 2 milligrams per square centimetre, which is considerably more product than most people use. Applying half that does not give you half the protection; the relationship is worse than linear.

This is the most important sentence on any sunscreen page. A well-applied SPF 30 outperforms a thinly applied SPF 50+, and no rating system compensates for under-application.

Reapplication, briefly

Ratings describe a single application under test conditions. Real exposure involves sweat, rubbing and time, which is why reapplication guidance exists regardless of the number on the tube.

Korean products increasingly come in formats designed for reapplication over makeup, including cushions and sticks. Those formats are a genuine convenience and they still require enough product to matter.

Reading a Korean sunscreen label end to end

Check SPF and PA together. Check the filter list, which the reader tool marks. Check whether the product carries water resistance labelling, which Korea grades separately. And check the rest of the formula, since Korean sunscreens frequently include niacinamide and calming ingredients alongside the filters.

That last habit catches something useful: a sunscreen with a brightening claim contains a listed active, and knowing that tells you what the claim rests on.

PA and SPF are not a package deal

It is easy to assume a high SPF implies high PA, and Korean labels regularly disprove it. Products at SPF 50+ with PA+++ sit alongside SPF 50+ PA++++ on the same shelf, and the difference is in the filter selection rather than the overall strength of the product.

If you are choosing a sunscreen for daily wear in a city, both ratings matter because both parts of the spectrum reach you through most of the year. If you are choosing for a beach day, water resistance labelling joins the list, and Korea grades that separately with its own testing.

Where the ratings came from

The PA system originated in Japan and was adopted in Korea, which is why the two markets share the notation while Europe uses a circled UVA symbol and the US uses broad spectrum. None of these is a global standard, and a product sold in three markets can carry three different UVA notations describing the same formula.

For a shopper importing Korean sunscreen, that means the PA rating on the box is a Korean rating tested to Korean methods. It is not directly convertible into a European or American figure, and treating it as roughly equivalent is the most anyone can honestly do.

For this update: I rechecked the PFA cutoffs behind all four Korean PA grades against the current official table.

Frequently asked