This cheat sheet contains the basics for sizing reinforced concrete sections in accordance with the Eurocodes.
The cheat sheet uses some conservative simplifications to make the calculations faster, such as assuming a neutral axis depth and ignoring the reinforcement ratio when calculating the unreinforced shear capacity of a section.
Assuming that the neutral axis depth is at 0.45d may be conservative unless you are putting a very large amount of reinforcement in your section (as the compressive force can be taken on a smaller depth of concrete and your lever arm z will therefore be greater).
Ignoring the reinforcement ratio when calculating the shear capacity of an unreinforced section means that vmin can be used as the shear strength, which is easily pre-calculated.
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