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Most rebar (steel reinforcement bar) is approximately round.

Measure the diameter of the bar, that is, the thickness of the bar.

Divide the measurement by 2 to get the radius.

Use the formula pi x r2 (3.14 x radius x radius) to get the cross sectional area. The formula works for all measurement units whether they are inches, millimeters, centimeters or others.

An alternative is to use (pi x d^2)/4. (3.14x diameter x diameter divided by 4) You do not then need to divide the original diameter.

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Q: How do you calculate cross sectional area in rebar?
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