Free Civil Engineering
Civil and construction calculators for the jobs that come up before a drawing is final: how much concrete a slab needs, how many bricks a wall takes, how many tiles cover a floor once grout and wastage are included, how much reinforcement steel weighs and costs, and how a simple beam behaves under a load. Many follow Indian practice (the concrete mix tool uses IS 10262:2019, bearing capacity uses Terzaghi's theory with IS 6403, and the staircase tool applies the NBC and Blondel's rule), and the board foot and brick tools also cover US sizes.
They are meant for preliminary design, quantity estimates and checking your own working. Anything that carries load or protects people should be designed and signed off by a licensed structural or geotechnical engineer, and quantities should be confirmed against the drawings and the supplier's specifications.
16 tools available
Most Popular
Calculate concrete volume for slabs, beams, columns, footings, and staircases with M20 material quantities.
Try it free →Beam CalculatorCalculate reactions, shear force, bending moment, and deflection for simply supported beams under UDL, point load, or applied moment.
Try it free →Construction Cost EstimatorEstimate house construction cost in India by area, floors, city tier, and construction type with trade-wise breakdown.
Try it free →Which tool should I use?
- Concrete for a slab, beam, column or footing: Concrete Volume Calculator — volume plus material quantities for M20.
- A mix design for a given grade: Concrete Mix Design — IS 10262:2019, M10 to M40, cement, water and aggregates for the volume you need.
- Steel reinforcement: Rebar Calculator — weight and cost from a bar schedule, with wastage.
- Bricks and mortar for a wall: Brick Calculator — modular, standard Indian and US brick sizes.
- Tiles for a floor or wall: Tile Calculator — grout joint, wastage, box count and cost.
- Paint for a room: Paint Calculator — subtracts doors and windows and counts coats.
- A staircase layout: Staircase Calculator — risers, treads and stringer length, checked against the NBC with Blondel's formula.
- A roof pitch or rafter length: Roof Pitch Calculator — from rise and run, an angle or a pitch notation.
- Reactions and bending moment in a beam: Beam Calculator — simply supported beams under a distributed or point load; the cantilever version handles a beam fixed at one end.
- Section properties: Moment of Inertia Calculator — second moment of area for rectangles, circles, hollow, I and T sections.
- Soil bearing capacity: Bearing Capacity Calculator — ultimate and safe values for strip and rectangular footings.
- Earthwork volumes: Cut & Fill Calculator — cut and fill from a grid of levels, with swell and shrinkage.
- Area of an irregular plot: Coordinate Area Calculator — area, perimeter and centroid from vertices.
- A first budget for a house: Construction Cost Estimator — area, floors, city tier and construction type, with a trade-wise breakdown.
All Civil Engineering (16)
Calculate reactions, shear force, bending moment, and deflection for simply supported beams under UDL, point load, or applied moment.
Open tool →Concrete Volume CalculatorCalculate concrete volume for slabs, beams, columns, footings, and staircases with M20 material quantities.
Open tool →Concrete Mix DesignDesign concrete mixes per IS 10262:2019 for M10 to M40 grades. Get cement, water, and aggregate quantities for any volume.
Open tool →Rebar CalculatorCalculate steel reinforcement weight and cost from bar schedules. Supports T6 to T32 with wastage and price per tonne.
Open tool →Board Foot CalculatorCalculate board feet from thickness, width and length, with quantity, waste and cost. Converts to cubic feet and cubic metres.
Open tool →Brick CalculatorCalculate number of bricks for any wall with mortar quantities. Supports modular, standard Indian, and US brick sizes.
Open tool →Staircase CalculatorCalculate staircase risers, tread depth, stringer length, and NBC compliance using Blondel's formula.
Open tool →Paint CalculatorCalculate paint litres needed for any room. Accounts for doors, windows, paint type, coats, and coverage rate.
Open tool →Roof Pitch CalculatorCalculate roof pitch angle, slope percentage, pitch ratio, and rafter length from rise/run, angle, or pitch notation.
Open tool →Tile CalculatorCalculate tiles needed for any floor or wall area with grout joint, wastage, box count, and cost estimate.
Open tool →Construction Cost EstimatorEstimate house construction cost in India by area, floors, city tier, and construction type with trade-wise breakdown.
Open tool →Moment of Inertia CalculatorCalculate second moment of area (Ixx, Iyy) for rectangle, circle, hollow, I-section, and T-section profiles.
Open tool →Cantilever Beam CalculatorCalculate fixed-end moment, shear, and tip deflection for cantilever beams under UDL or point load.
Open tool →Cut & Fill CalculatorCalculate earthwork cut and fill volumes from a grid of elevations. Accounts for swell and shrinkage factors.
Open tool →Coordinate Area CalculatorCalculate polygon area, perimeter, and centroid from vertices using the Shoelace formula. Live diagram included.
Open tool →Bearing Capacity CalculatorCalculate ultimate and safe bearing capacity of soil using Terzaghi's theory and IS 6403 for strip and rectangular footings.
Open tool →Frequently Asked Questions
- Can I use these results for structural design?
- Use them for preliminary design, quantities and checking your own working. They are not a substitute for a design by a licensed structural or geotechnical engineer, and anything that affects safety should be verified by one.
- How much extra material should I allow?
- The tile, brick and rebar tools let you enter wastage, and the paint tool accounts for doors, windows and coats. How much to allow depends on the material, the layout and the installer, so use the figure your supplier or site engineer recommends instead of a fixed rule.
- Which standards do the Indian calculators follow?
- The concrete mix design tool follows IS 10262:2019 for grades M10 to M40, bearing capacity uses Terzaghi's theory with IS 6403, and the staircase tool checks the NBC with Blondel's formula. Each tool page states the method it uses.
- What is the difference between the beam and cantilever calculators?
- The Beam Calculator handles simply supported beams: reactions, shear force, bending moment and deflection under a distributed or point load. The Cantilever Beam Calculator handles a beam fixed at one end and free at the other: fixed-end moment, shear and tip deflection.
- How reliable is the construction cost estimate?
- The estimator multiplies built-up area by fixed per-square-foot rates for the city tier and construction type you choose. Those rates are built-in estimates, not quotes and not tied to a published index, so use the result for a first budget and ask contractors for quotes before you commit.