CostimexFree tools
Construction calculators that do the math for you.
Quick, accurate estimating tools used by contractors, builders and DIYers. No signup, no email — instant results.
Concrete Volume Calculator
Cubic yards/metres for slabs, footings & columns. Includes 5–10% waste factor.
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Brick & Block Calculator
How many bricks or blocks for any wall area. UK & US standard sizes.
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Paint Quantity Calculator
Litres or gallons needed by wall area, coats and coverage rate.
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Construction Cost per Sq Ft
Quick ROM budget by area and build quality — residential to commercial.
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Rebar Weight Calculator
Total weight & length of reinforcing steel by diameter and spacing.
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Drywall Sheet Calculator
Number of plasterboard sheets, screws and joint compound by area.
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AI Drawing Estimator
Upload a floor plan or elevation — get a ROM cost range with CSI-style breakdown in seconds.
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Get your estimate in 24 hours.
Upload your drawings today. Certified estimators deliver Excel cost breakdowns and marked PDFs back to you within 24–48 hours — guaranteed.
- 98% accuracy
- 24–48h delivery
- No upfront payment