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Formwork hydrostatic pressure

The pressure if concrete behaved as a liquid to the full pour height. Real design pressure is often lower.

Vertical height of fluid concrete (m)

Unit weight (kN/m³)

CalculateReset

Method

p = unit weight × height. Worked case: 25 kN/m³ over 3 m is 75 kN/m².

CIRIA C766 uses pour rate, temperature and concrete behaviour. This page does not. A temporary-works coordinator still has to design the form. See temporary works limit.

Last checked 2 October 2026. A scenario, not a design. See methodology, standards and the disclaimer.