Useful for C20/25 to C40/50
Start from a typical strength class as a reference point, then enter the actual specified class, exposure class and target slump for your project.
CONCRETE MIX DESIGN
EN 206 Concrete Mix Design Calculator
Calculate a transparent preliminary concrete mix to EN 206 — pick a strength class and an exposure class, and see the durability limiting values behind the mix, not just a final number. Then buy a detailed €4.99 calculation report for your files.
Build a mix you can actually check
Design Mix Concrete works through proportioning by the absolute-volume method and shows the calculation trail at each step. EN 206 does not prescribe one recipe for durability; instead it sets limiting values by exposure class — a maximum water-cement ratio, a minimum cement content, a minimum strength class and, where relevant, a minimum air content for freeze-thaw resistance. Results are preliminary: national annexes can be stricter, so always verify the current standard, the project specification, material tests and trial batches before use.
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Frequently asked questions
What does EN 206 cover?
EN 206 is the European specification, performance, production and conformity standard for concrete. For durability it sets limiting values — maximum water-cement ratio, minimum cement content, minimum strength class and minimum air for freeze-thaw — against each exposure class. National annexes such as BS 8500 (UK) or DIN 1045-2 (Germany) can be stricter.
Is it free?
Yes. Design Mix Concrete is free to use and supported by advertising. The €4.99 report is optional.