A decision is only as good as the number behind it. Here you get both halves: the computation itself and a plain-English explanation of what drives it.
A quick word on privacy. The computation happens on your device, not on our servers.
The idea in plain terms
For round elements use π × r². Precise planning saves money: underbuying stops the build; excess often can't be returned. Compute each and sum. Screed calculator turns dimensions of a room, roof or foundation into concrete quantities of materials — cubic metres of concrete, kilograms of cement, litres of paint, number of tiles.
For irregular shapes, depends on your decomposition. Typical visitors are users in New York, Texas, California and Florida comparing offers or checking a bill, so the worked examples below use realistic local values rather than abstract numbers.
The arithmetic behind the result
For volume materials (concrete, screed), yes — type in separately. For the United States, use the units printed beside each field and do not assume that a familiar name means the same measurement system. Simple geometry (area, volume) plus industrial coefficients for density, coverage and waste.
For irregular shapes, decompose into simple figures and sum. Standard practice adds 5–15% waste allowance — 10–15% for tiles, 5–10% for concrete, 10% for paint.
How this calculation applies in United States:
Where this comes in handy
- VAT / sales tax: The US has no federal VAT. Instead, each state applies its own sales tax (0% in Oregon, Delaware, Montana, New Hampshire; up to 7.25% base in California) plus city/county surcharges that can push the effective rate above 10%. Sales tax is typically added at checkout, not included in the sticker price.
- Units of measure: US uses imperial: miles, pounds, °F, US gallons, feet/inches. Note that an US gallon (3.785 L) is different from an UK imperial gallon (4.546 L) — always confirm which.
- Currency & format: US dollar (USD, $). No decimal separator for thousands — use commas ($1,000.00).
- Salary & taxes: Federal income tax is progressive (10–37%) plus state tax (0% in Texas, Florida, WA; up to 13.3% in CA). FICA (Social Security + Medicare) adds 7.65% employee-side. Employer typically covers ~8% of your gross in payroll taxes on top.
- Electrical supply: Mains is 120 V / 60 Hz, Type A/B plugs. 240 V circuits exist for high-load appliances (dryer, oven).
What happens when you hit calculate
This Screed calculator is tuned to practice in the US: amounts are shown in US dollar (USD, $), formatted as $1,234.56, and quantities use imperial (miles, lb, °F, US gallons). That means the output can be used directly with an accountant, lender or employer in the US without converting anything.
Start by checking the input fields rather than the final number. Keep the original measurement, invoice, specification or log beside the calculation so that a misplaced decimal point can be found.
The values entered here are Floor area (m²), Screed thickness (cm), Waste allowance (%), Mix type, Bag weight (kg), Bag yield (m³ per bag). Recalculate after changing one input at a time; this gives which assumption controls the figure and makes an unexpected answer easier to diagnose. Where income, tax or contributions are involved, the reference framework is IRS and Social Security & Medicare (FICA) — federal brackets 10–37% plus state tax; no VAT, sales tax instead.
This is the point where most guides stop — which is a pity, because the next part is where the number becomes handy.
The right moment to compute
Forgetting substrate for tiles (adhesive, grout). Using theoretical coverage with no waste. State-level details may vary. Ignoring windows, doors and columns when computing paint.
Mixing m² and m³. Numbers on this page reflect US practice — dollars, imperial units, and federal defaults where applicable.
The traps to sidestep
Example: for area 45 m², the tool returns concrete quantities (concrete, paint, tiles, cement) including recommended waste. Every figure above applies to United States specifically and is reviewed when the rules change.
Buy paint from a single batch — colours vary slightly between batches. Break it into rectangles and triangles.
Small habits, better numbers
Concrete: never order 'exactly' — 5% overage prevents work stoppage over 20 litres short. Straight to the numbers — here is how Screed calculator behaves under US rules, units and pricing conventions. Always add the recommended waste. For regular shapes, 95%+.
The essence
You came for a number; the page gave you the reasoning as well. Revisit the screed calculator whenever a parameter moves — small changes compound.
the United States-specific questions
Is this Screed calculator valid for the United States?
Yes. It uses US dollar (USD, $) and imperial (miles, lb, °F, US gallons), and any tax or contribution reference follows IRS rules.
Which units and number format are used?
Amounts display as $1,234.56 and quantities in imperial (miles, lb, °F, US gallons) — the official convention in the US.
Which pension and tax model is assumed?
Social Security + 401(k) / IRA. The tax framework is federal brackets 10–37% plus state tax; no VAT, sales tax instead.