Coverage calculator
The general coverage problem: area over rate, rounded up to whole containers.
%
Containers to buy
15
- Exact requirement
- 14.667
- Total area to cover including coats and waste
- 176.00
- Cost
- 420.00
- Surplus coverage
- 4.00
- Cost per unit of area
- 5.25
Show the working
- Area to cover = 80
- Coverage per container = 12
- Coats or passes = 2
- Waste allowance = 10
- Price per container = 28
- Total area to cover including coats and waste = 80 * 2 * (1 + 10/100) = 176
- Exact requirement = 176 / 12 = 14.6667
- Containers to buy = ceil(14.6667) = 15
- Cost = 15 * 28 = 420
- Surplus coverage = 15 * 12 - 176 = 4
- Cost per unit of area = 80 > 0 ? 420 / 80 : 0 = 5.25
Values are shown to six significant figures here; the arithmetic itself runs on exact fractions and is only rounded where a number is printed.
Scenarios & local history
Compare a saved scenario
Recent calculations
The formula
- containers = ceil(area x coats x (1 + waste) / coverage per container)