Financial Calculators
Unit Price Calculator - Compare Price Per Unit
Compare the price per unit of up to 6 products side by side. Enter a price and quantity for each item to instantly see which option gives the best value for money.
| Item ▲▼ | Price ▲▼ | Qty ▲▼ | Per oz ▲▼ | vs Best ▲▼ |
|---|---|---|---|---|
| Small | $1.49 | 16 | $0.0931 | +49.4% |
| Medium | $2.29 | 32 | $0.0716 | +14.8% |
| LargeBest | $3.99 | 64 | $0.0623 | - |
Price per oz - visual comparison
Why Compare Unit Prices?
Supermarkets and online retailers often sell the same product in multiple pack sizes. A larger pack may seem more expensive at first glance but could cost significantly less per unit. Comparing unit prices is one of the most effective ways to reduce grocery and household spending.
How Unit Price Is Calculated
Unit Price = Total Price ÷ Quantity. If a 32 oz bottle costs $2.29, the unit price is $2.29 ÷ 32 = $0.0716 per oz.
Tips for Accurate Comparisons
Always use the same unit of measurement for all items. If one product is labelled in grams and another in kilograms, convert them first. Include the full price after any discounts or coupons are applied.
Common unit confusion
Pay attention to unit type, not just unit name. A fluid ounce (fl oz) measures volume; a weight ounce (oz) measures mass - they are not interchangeable. Similarly, “count” pricing (per sheet, per tablet, per pod) requires a quantity check before comparing to per-weight pricing. A 100-count pack priced at $0.10 per tablet may be a better or worse deal than a 200-tablet bottle - you have to look at the per-tablet price, not the pack price.
Bulk buying trade-off
A lower unit price does not always equal the best value. Consider these factors before buying in bulk:
- Spoilage: a 10 lb flour bag at $0.06/oz is a worse deal than a 5 lb bag at $0.07/oz if half the larger bag goes stale before you use it.
- Storage space: bulk items require pantry or freezer space that has its own cost and opportunity cost.
- Upfront cash outlay: a bulk purchase ties up cash that could be used elsewhere, even if the long-run unit price is lower.
Store-brand vs. name-brand
Store brands are typically 20–40% cheaper per unit than name-brand equivalents with comparable quality. Many store-brand products are manufactured by the same companies that produce the name brands - the difference is labelling and marketing spend. Comparing unit prices between store-brand and name-brand options is one of the highest-impact grocery shopping strategies available.