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RAL 转 HEX RAL Classic ↔ Hexadecimal 免费 在线 安全

用 RAL 写一个值，右边立刻就是 HEX。算术在你的浏览器里跑，什么都不往外发，而结果取决于什么，下面写着，不靠默认。

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A paint standard, approximated on screen
RAL
#2874B2 HEX
The RAL colour as a screen shows it — the sample card is the real one

RAL 5015 (Sky blue) = #2874B2

关于这个转换器
公式 RAL NNNN → #RRGGBB
会保留什么 What a screen can keep of a RAL colour: every RAL Classic code is a fixed, numbered paint, and each is listed here with the sRGB value most often used for it. Going from a code to a colour is a look-up. Going the other way, the page searches the whole collection for the nearest paint, shows your colour and that paint side by side, and says how far apart they are as a delta E — about 1 is the smallest difference an eye can see, and under 3 is a close neighbour.
做不到什么 RAL is a physical standard: the colour is the sample card, seen in daylight, not the numbers on a screen. Screens differ, and the sRGB values published for RAL differ a little from one list to the next, so read the result as a close guide, never as a specification — for paint, powder coat or anything ordered by code, check the card. A colour you choose is rarely a RAL colour, so the nearest one can be far away: look at the delta E, not just the code. Only RAL Classic is covered; RAL Design, RAL Effect and RAL Plastics are different collections. And many RAL colours lie outside what four printing inks can reproduce, so a CMYK value is an approximation of an approximation — the printer's own match is the one to trust.
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Where RAL comes from

RAL is a German colour standard. It began in 1925 as the Reichsausschuss für Lieferbedingungen, the committee that fixed delivery terms for industry, and its first colour register followed in 1927 so that a buyer and a supplier could name a paint by number instead of describing it. RAL Classic, the collection on this page, still works that way: each colour has a four-digit code, and the first digit tells you the family — 1 yellow and beige, 2 orange, 3 red, 4 violet, 5 blue, 6 green, 7 grey, 8 brown, 9 white and black. The other three digits are a running number, not a measurement, so two nearby codes can be quite different colours. The standard names paints; it does not describe a colour space, which is why a screen can only ever show an approximation of one.

Where you meet RAL colours

RAL codes are how colour is ordered where the result has to match: powder-coated and lacquered metal, window and door frames, railings, vehicles and machinery, signs, cables and pipes. Architects and fabricators write RAL 9010 or RAL 7016 on a drawing and every workshop understands it. That is what makes the conversions on this page useful: a designer has a hex value and a supplier wants a RAL number, or a RAL colour has to be put into a mock-up, a stylesheet or a print file. The result is a starting point to confirm against the card, not a substitute for it.

常见问题

Is the colour I see on screen the real RAL colour?

No. A RAL colour is defined by a physical sample, judged in daylight, and your screen has its own brightness, contrast and colour profile. The values here are the sRGB ones in common use, and sources differ slightly. They are good for choosing and comparing; for ordering or matching a paint, hold the RAL card against the real thing.

Why does the page give the nearest RAL colour and not the exact one?

Because RAL Classic is a list of about two hundred fixed paints, while a screen can show more than sixteen million colours. Almost any colour you type falls between two paints. The page picks the closest one in perceptual terms and shows the delta E: about 1 is a difference you can barely see, under 3 is a close neighbour, and ten or more is a different colour that merely happens to be the nearest.

What do the four digits of a RAL code mean?

The first digit is the colour family — 1 yellow and beige, 2 orange, 3 red, 4 violet, 5 blue, 6 green, 7 grey, 8 brown, 9 white and black. The last three are a running number within that family. They say nothing about lightness or saturation, so RAL 5015 and RAL 5017 are both blues but not close ones.

How do I type a RAL code?

As RAL 5015, RAL5015, ral-5015 or just 5015: capital letters, spaces and the prefix do not matter. A code that is not in RAL Classic, such as 5016, gets a message instead of a guess.

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