Formwork Pressure

Lateral form pressure (ACI 347 short form) capped at wet head.

Run the calculator

Example

You enter

Pour rate (ft/hr) 5
Concrete temperature (°F) 70
Weight factor normal
Unit weight (pcf) 150
Wall height (ft) 12

You get

Pressure 793 psf
ACI value 793 psf
Wet-head cap 1800 psf
Weight factor 1

Details, formula, and sources

ACI 347 short-form pressure: P = C_w × (150 + 9000 × R / T) capped at the wet-head pressure ρgh. R is pour rate (ft/hr), T is concrete temperature (°F), C_w is unit-weight coefficient.

ACI 347R-14 (Guide to Formwork for Concrete) by name.

ACI 347 licensed; engineering-practice formulas free in published concrete texts.

Estimate. AHJ and licensed structural engineer govern.

Field names used by the API: pour_rate_ft_per_hr, concrete_temp_F, weight_factor, unit_weight_pcf, wall_height_ft, pressure_psf, aci_pressure_psf, wet_head_psf

Concrete unit weight 150 pcf normal-weight unless user suppliesACI 347