Concrete
Estimate rectangular slab volume, waste and cost per volume unit.
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Smart Construction Calculators
Measure materials. Plan your purchase.
Use your measurements and product details to estimate concrete, brick, tile, paint and flooring quantities. Add your own prices for a material purchase budget.
5
Construction calculators
Editable
Waste allowances
No account
Required to calculate
Popular calculators
Our calculator categories
Five tools for material planning.
Brick
Deduct wall openings and estimate whole bricks with a waste allowance.
Open calculatorTile
Measure floor and wall coverage to better estimate tile box requirements.
Open calculatorPaint
Work out paint quantities, coats, and coverage before purchase.
Open calculatorFlooring
Estimate room area, waste and complete packs using the coverage on the box.
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Why Calkora
See how measurements become purchase quantities.
Material planning
Quickly estimate concrete, brick, tiles, paint, and flooring with practical formulas.
Whole purchase units
See whole bricks, boxes or cans and costs based on the unit price you enter.
Construction-focused guidance
Read the formulas, assumptions and limitations before using an estimate to order.
Helpful guides
Practical guides for material decisions.
How to estimate material waste
Separate net quantities, waste and whole-pack purchases before making an order.
Choosing the right floor covering
Compare room needs, product specifications, subfloor preparation and pack budgets.
Paint coverage and primer planning
Learn how surface preparation and coat count change the amount of paint you need.
How to use Calkora
- Choose a calculator and measure the dimensions in the units shown. Use the count only for identical sections.
- Enter product dimensions or coverage from the pack. Adjust the waste allowance for your layout; the default is an example.
- Add an optional price in the stated unit, then calculate. Check whole-pack quantities as well as the raw requirement.
- Review the methodology and product instructions before ordering. Results are planning estimates.
Questions before you start
Do I need an account?
No. All five calculators accept measurements and show results without registration.
Does the cost include installation?
No. It uses your material price and the calculated volume or whole purchase units. Add labour, delivery, tax and accessories separately.
Why do I need more than the measured area?
Waste allowances and complete boxes can increase the purchase quantity. The waste planning guide explains the difference.
Can I calculate rooms with different dimensions together?
The count repeats the same dimensions. Measure different-sized rooms separately and check whether your supplier can pool the material into one order.