Free Construction Calculators for Contractors | ScopeTakeoff
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Construction Calculators Built for Contractors

The majority of calculators built for contractors give you a residential answer. Our construction calculators are built by an active contractor for contractors that are bidding jobs in the real world. With waste percentages included, supplies and material accounted for and math you can put straight on an estimate.

The calculators

Free calculators — ready to use

Live
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CMU Block Calculator

Block count, bags of mortar, and grout CY from wall measurements. Calculates for all sizes of CMU block.

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Rebar Calculator

Rebar totals and required LF by size and spacing on center, with lap splices calculated for slabs, footings, walls, etc.

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Concrete Slab Calculator

Cubic yardage, bagged mixes based on slab dimensions with waste percentage and thickness options.

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Drywall Calculator

Sheets needed by size, with mud, tape, and fasteners from room dimensions or sqft totals.

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Roofing Squares Calculator

Squares from sqft and pitch, add waste percentage by complexity of roof design..

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Paint Coverage Calculator

Gallons by coats required and surface, with primer calculated separately.

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Fence Calculator

Posts, panels, rails, and concrete all from linear footage, gate count and section spacing.

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Why these are different

Contractor math, not DIY math

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Built by a working contractor

Each and every formula was created by someone who actively bids this work for a living, not a marketer who built it for a homeowner site.

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The whole quantity, not just the count

Waste percentages, mortar, grout, fasteners, splices, all extra material quantities that separate an estimating from guessing.

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Actually free

No paywall, no signup with email, no trial bait and switch. Bookmark them, use them on every bid.

Go deeper

Estimating guides from the same playbook

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How to Estimate a Concrete Slab

The full manual method, area, volume, rebar, waste percentage, and a worked example.

Read the guide →
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How to Estimate Masonry

Wall areas, block counts, mortar, and man hours, step by step.

Read the guide →
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How to Price Drywall Jobs

Materials, labor, and markup, how to get from sheet count to a real profitable price.

Read the guide →
FAQ

Common questions

Are these construction calculators really free?+
Yes. Every calculator on this page is 100% free, no signup, no email, no limits. They’re built by the team behind ScopeTakeoff, and we publish them because accurate material math should be available to every contractor and our active estimators use these tools in their bid process everyday.
How are these different from other construction calculators?+
Most online construction calculators are built for homeowners, a bare material count and nothing else. Ours are built for contractors bidding real jobs with waste, real coverage rates, and the supporting quantities (mortar, grout, ties, fasteners) you actually need on an estimate.
Can I use these for commercial bids?+
Yes,the formulas follow standard construction math and work for residential and commercial estimating alike. For full commercial scopes with priced assemblies, labor, and SOV output formatted for GC submission, that’s what ScopeTakeoff itself does.
Do the calculators include labor costs?+
The free calculators focus on material quantities counts, volumes, and coverage with waste factored in. Labor varies too much by market to hard-code responsibly. ScopeTakeoff’s full estimating assemblies include material, labor, and equipment costs you can adjust to your own rates.

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to complete bid?

ScopeTakeoff turns plan sheets into priced estimates with material, labor, and SOV output. $100/person/month.

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