Construction Calculators

This construction calculator hub brings together free tools for concrete and masonry, roofing and framing, beams and structural loads, and building materials.

Concrete and Masonry 8 uses

Concrete Block Calculator

This concrete block calculator finds how many concrete blocks (CMUs) you need to cover a given…

Concrete and Masonry 6 uses

Concrete Slab Maximum Wall Load Calculator

This concrete slab wall load calculator gives a first-pass estimate of the maximum wall (line) load…

Beam and Structural 3 uses

Rectangular Beam Deflection Calculator

This beam deflection calculator finds the deflection of a solid rectangular beam and the section’s moment…

Beam and Structural 5 uses

Mechanical Advantage of a Screw Calculator

This mechanical advantage of a screw calculator finds the ideal mechanical advantage (IMA) — how much…

Beam and Structural 1 use

External Screw Thread Calculator

This external screw thread calculator finds the key dimensions of a 60° ISO/UN thread from the…

Beam and Structural 7 uses

Flat Diameter of Auger Screw Calculator

This flat diameter of auger screw calculator develops the flat pattern of a screw-conveyor flight —…

Beam and Structural 7 uses

Cantilever Beam Calculator

This cantilever beam calculator finds the deflection, slope, and bending moment of a beam fixed at…

Beam and Structural 14 uses

Bolt Pattern Calculator

This bolt pattern calculator finds the bolt circle diameter (BCD) — the diameter of the circle…

Building Materials 3 uses

Floor Space Index (FSI) Calculator

This Floor Space Index calculator finds your FSI (also called FAR) from the total built-up area…

Building Materials 4 uses

Wood CFT Calculator

This Wood CFT calculator finds the volume of timber in cubic feet (CFT) for both sawn…

Concrete and Masonry 4 uses

Plaster Calculator

This plaster calculator works out the cement and sand you need to plaster a wall. Enter…

About Construction Calculators

This construction calculator hub brings together free tools for concrete and masonry, roofing and framing, beams and structural loads, and building materials. Choose a calculator below to estimate quantities and costs, with the formula and an example on every page.

Accurate material estimates cut waste and keep a job on budget. These calculators turn dimensions into yards of concrete, squares of roofing, or board feet of lumber in seconds, and show the math so you can double-check before you order.

Browse the calculators

Concrete and Masonry Calculators

Roofing and Framing Calculators

Beam and Structural Calculators

Building Materials Calculators

Frequently Asked Questions

What can I estimate with these construction tools?

Concrete volume and mix, roof pitch and rafters, beam deflection and loads, plaster, pavers, tile, and building materials. Each calculator handles one task with its formula and a worked example.

Are these construction calculators free?

Yes. Every tool here is free, needs no signup, and runs in your browser on mobile or desktop.

Do the results include the formula?

Yes. Each page shows the equation, defines the inputs, and gives a numeric example so you can verify the estimate yourself.

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