Before you buy
Compare Material Packages by Coverage and Total Cost
A lower price per square metre or cubic foot can still produce a higher shopping total. Compare the whole packages needed for the same job, using coverage and prices from the exact products.
Compare two package options
Use the same material and measurement unit for both options. Enter each product’s actual usable coverage or mixed yield.
Enter the quantity and both package coverages to compare an order.
Compare products that can do the same job
Choose two products already confirmed as suitable for your project. This comparison covers quantity and package cost; it cannot decide strength, finish, substrate compatibility, application method or manufacturer requirements.
Enter the net quantity in one unit, such as square metres, square feet, litres or cubic feet. Both package coverages must use that same unit. For paint, first calculate the total paint volume including coats; for concrete, use mixed yield rather than dry bag weight.
Apply the allowance, then buy complete packages
The allowance is your project-specific choice. It is added once to the net quantity before dividing by each product’s coverage. Each option is rounded up separately, because you would buy one option or the other. The comparison does not combine different products into a mixed order.
Package-rounding extra is the supplied quantity minus the requirement after allowance. It is separate from the planned allowance and may differ between package sizes.
Worked example: the cheaper coverage rate costs more
Suppose the job needs 21 square metres with no added allowance. Option A covers 10 square metres per package and costs 9 currency units. Option B covers 7 square metres and costs 7 currency units. These are invented arithmetic inputs, not product listings or price quotes.
Option A has a lower rate per square metre, but buying three packages costs 27 and supplies 30 square metres. Three Option B packages cost 21 and supply exactly 21 square metres. Whole-package rounding changes the comparison.
| Option | Coverage per package | Packages | Supplied | Extra after requirement | Cost |
|---|---|---|---|---|---|
| A | 10 m² | 3 | 30 m² | 9 m² | 27 |
| B | 7 m² | 3 | 21 m² | 0 m² | 21 |
Check what the comparison leaves out
Use both prices in the same currency. Leaving one blank keeps its quantity result and displays no price; entering zero records a zero price. The tool does not add delivery, tax, discounts, deposits, minimum orders or installation.
This coverage comparison does not optimize cut layouts, wallpaper drops or pattern repeats. Use the wallpaper strip calculator for rolls, and the relevant area or volume calculator before comparing packages. A compatible material already listed in a project should be combined before purchase rounding.
Frequently asked questions
Can I compare 60 lb and 80 lb concrete bags?
Yes, if both are suitable mixes and you enter their actual mixed yields in the same volume unit. Bag mass alone is not a coverage figure. Check the exact product data sheet.
Can I compare two flooring carton sizes?
Yes. Use the same project area and planned allowance, then enter each carton’s published coverage. Layout, cuts, colour batches and product suitability still require separate checks.
Why is the cheapest unit rate not always the cheapest order?
You buy complete packages. Different coverage can leave different extra quantities, so compare package count times package price for the actual requirement.
Sources and method
- PackLedge quantity methods
Original derivations using geometry, ratios, sums and whole-package rounding. Each calculator explains its assumptions and worked examples.
- NIST — SI Units ↗
Reference for length, mass, area, volume and the distinction between base and derived units.
- Your selected product label or technical sheet
The source for the coverage, mixed yield, density, package capacity, sheet dimensions or wallpaper repeat that you enter.