Unit Price Calculator
Work out which product is really cheaper — by unit price, with both products in the same unit, and the saving shown.
The bigger pack is not always the better deal — and the only way to know is the unit price. This calculator compares two products in the same unit and tells you which is cheaper, and by how much.
Same unit, same comparison. That is the whole trick.
Your results
Enter your measurements and press Calculate.
Quantities are rounded up to whole tiles, planks, boxes or bags, after the wastage allowance. Cost appears only when you enter a price.
Formula
All lengths are converted to a single unit before the calculation: 1 ft = 0.3048 m, 1 in = 25.4 mm, 1 ft² = 0.09290304 m², 1 yd² = 9 ft². Material quantities are rounded up — you cannot buy part of a tile, plank or bag.
How to use this calculator
- Enter product A's price and quantity.
- Enter product B's price and quantity.
- Choose the unit — the same unit for both products.
- Read the unit prices, the cheaper product and the saving.
Worked example
| Product A | $12 for 500 g → $12 ÷ 500 = $0.0240 per g |
|---|---|
| Product B | $20 for 1,000 g → $20 ÷ 1,000 = $0.0200 per g |
| Cheaper | Product B |
| Saving | |0.0240 − 0.0200| ÷ 0.0240 = 16.67% |
Check it by hand: every step above uses the formula in the box. If your numbers match the example inputs but the calculator gives a different answer, please report it via the contact page.
Frequently asked questions
Why compare unit prices instead of prices?
Because the cheaper price is often the dearer product: $12 for 500 g costs $0.024/g, while $20 for 1,000 g costs $0.020/g — the $20 product is cheaper per gram. Unit price is the only fair comparison.
Why must both products use the same unit?
Because a price per gram and a price per kilogram are different numbers for the same product. Matching quantities and units are what make the comparison valid — this calculator enforces it with one shared unit.
What if the quantities are in different units?
Convert one first — 1 kg is 1,000 g, 1 L is 1,000 ml. Use the length, area or volume converter on this site, then compare here.
What does the saving percentage mean?
How much cheaper the cheaper product is, as a percentage of the dearer product's unit price. Product B at $0.0200/g saves 16.67% against product A at $0.0240/g.
Related calculators
Estimates only. Results are for planning. Measure twice, confirm box coverage and tile sizes on the packaging you buy, and follow the manufacturer's instructions. See the disclaimer.