Technical calculations
Calculation aids for site work. Indicative results.
These tools provide estimates and calculation aids. They are neither design calculations nor an engineering approval: any design or safety decision must be checked by a qualified professional against the applicable standards.
- Free, no sign-upThe calculators are freely available.
- Print and PDFEvery result can be printed or saved as PDF from the browser.
- Assumptions shownEach tool states its assumptions and limits.
- Need more?Our professional software goes further.
Concrete
Concrete volumeConcrete
Concrete mix: cement, sand, aggregate, waterConcrete
Reinforcement bar weightConcrete
Reinforcement estimate by ratio (kg/m³)Concrete
Buildings and structures
Solid slab: concrete, formwork, steelBuildings and structures
Beams: concrete, formwork, steelBuildings and structures
Columns: concrete, formwork, steelBuildings and structures
Pad footings: excavation, blinding, RCBuildings and structures
Masonry walls: area, blocks, mortarBuildings and structures
Earthworks
Excavation: pit or trench with side slopesEarthworks
Compacted backfill and material to supplyEarthworks
Cut and fill volumes (average end area)Earthworks
Roads and measurements
Pavement layers: volumes and tonnagesRoads and measurements
Asphalt: tonnage and truckloadsRoads and measurements
Area and perimeter from coordinatesRoads and measurements
Hydraulics and sanitation
Gravity flow in circular pipe (Manning)Hydraulics and sanitation
Trapezoidal or rectangular channel (Manning)Hydraulics and sanitation
Sewer slope between two manholesHydraulics and sanitation
Pressure pipe head loss (Darcy-Weisbach)Hydraulics and sanitation
Head loss (Hazen-Williams) – rising mainsHydraulics and sanitation
Tank / basin / wet well volumeHydraulics and sanitation
Flow unit conversionHydraulics and sanitation