Civil calculators

Concrete and earthwork quantities, channel flow, stormwater runoff and outrigger pad pressure for site and civil work.

• Concrete volume and rebar weightConcrete volume and mass for slabs, walls, footings and columns with waste, cement/sand/aggregate for nominal mixes, and rebar length, mass and steel ratio.
• Crane outrigger pad bearing pressureOutrigger load, float and mat bearing pressure, effective mat area by load spread, ground utilisation and required mat size for a mobile crane.
• Earthwork cut and fill volumesVolumes by the average end area and prismoidal methods from cross-sections, with swell, shrinkage and haul mass.
• Open-channel flow (Manning)Manning flow in rectangular, trapezoidal, triangular and circular channels: velocity, discharge or normal depth, Froude number, critical depth, shear stress.
• Rational-method runoffDesign peak runoff from catchment area, runoff coefficient and rainfall intensity, with time of concentration (Kirpich).