A focused library of free tools

33 practical calculators for faster decisions.

Enter the numbers you know, get an immediate answer and review the calculation behind it.

Try “battery”, “attendance”, “storage” or “marks”.

Unit Price Calculator — Compare Two Packs

Which pack gives you more for your money? Enter the price and quantity of two comparable products to compare their cost per 100 g, per 100 mL or per item. Use the same currency and quantity unit for both packs.

Try the example: 500 g of rice for $4 versus 750 g for $5. The second pack costs more at checkout but is about 16.67% cheaper per gram. The values below are ready to compare; replace them with your own prices.

Pack A
Pack B

Will the bigger pack still save money after discounts and waste? See the worked buying guide.

Formula, example and limits

Unit price = pack price ÷ quantity. Multiply by 100 for a comparison per 100 g or 100 mL. A 500 g pack costing 4 costs 0.80 per 100 g; a 750 g pack costing 5 costs about 0.667 per 100 g. Pack B is 16.67% cheaper per unit, but costs more at checkout.

Include comparable delivery charges and discounts in each price. Convert kilograms to grams or litres to millilitres first. Compare equivalent products: quality, concentration, spoilage and how much you will use matter. This tool does not fetch store prices or convert currencies. For production expenses, use the Cost Calculator.

Browse by tool

Calculator directory

33 published

Learn the method

Guides for real decisions

Worked examples connect the right calculator to the decision you need to make.

Explore all guides →