Engineering Calculators
Quantity calculators for civil, structural and site engineers — concrete, rebar, earthwork, asphalt, masonry and steel. Every result comes from a deterministic formula (no AI-generated numbers), with metric / imperial switching and step-by-step working you can audit.
Disclaimer：Results are produced by deterministic formulas and are intended for quantity estimating and option comparison only. A qualified engineer must verify them against the project specification, design documents and actual site conditions before use. The author accepts no liability for any loss arising from their use.
Concrete
- Concrete Volume CalculatorCalculate concrete volume for any rectangular pour: enter length, width and thickness, add a waste allowance,
- Concrete Slab CalculatorSlab concrete calculator: enter length, width and slab thickness in mm or inches to get pour volume in m³ / yd
- Concrete Footing CalculatorFooting concrete calculator for pad and isolated footings: set length, width, depth and the number of footings
- Concrete Beam CalculatorBeam concrete calculator: enter breadth, depth, length and number of beams to get concrete volume in m³ / yd³
- Rectangular Column Concrete CalculatorRectangular column concrete calculator: enter section width, depth, height and the number of columns for volum
- Round / Circular Column Concrete CalculatorCircular column concrete calculator: enter diameter, height and number of columns. Volume uses V = π/4 × d² ×
- Concrete Wall CalculatorConcrete wall calculator: enter wall length, height and thickness, and deduct door and window openings for wal
- Concrete Mix Materials CalculatorConcrete mix calculator: enter pour volume, mix ratio (M10/M15/M20/M25) and water–cement ratio to get cement b
Rebar & Steel
- Rebar Weight CalculatorCalculate rebar weight by diameter and length: unit weight W = 0.006165 × d² kg/m, total for any number of bar
- Rebar Quantity per Cubic Metre of ConcreteEstimate rebar tonnage from concrete volume using a reinforcement ratio in kg/m³. Typical ranges: 80–120 kg/m³
- Steel Bar Weight CalculatorSteel weight calculator for round bars: diameter and length → unit weight (kg/m) and total weight in kg and to
- Steel Pipe Weight CalculatorSteel pipe weight calculator: outside diameter, wall thickness and length → weight per metre and total. Formul
- Steel Plate Weight CalculatorSteel plate weight calculator: thickness, width, length and quantity → kg per plate and total tonnage. Formula
- Square Steel Bar Weight CalculatorSquare bar weight calculator: enter the side length and bar length to get kg/m and total weight in kg and tonn
Mortar & Masonry
- Plaster Mortar CalculatorPlaster mortar calculator: wall area, plaster thickness and mix ratio (1:3 / 1:4 / 1:6) give cement bags and s
- Brick & Mortar CalculatorBrick calculator: wall length, height, brick size and mortar joint → bricks, mortar volume, cement bags and sa
- Concrete Block (CMU) CalculatorConcrete block calculator: wall area and CMU size → number of blocks, mortar, and grout/core-fill concrete vol
Earthwork
- Excavation Volume CalculatorExcavation calculator for pits with optional side slopes: bottom area, sloped top area, bank volume and bulked
- Trench Excavation CalculatorTrench excavation calculator: trench length, bottom width, depth and side slope. Computes trapezoidal cross-se
- Backfill & Spoil CalculatorBackfill calculator: from excavation volume and below-grade structure volume, work out compacted backfill, loo
Paving & Roads
Engineering Translation
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