Unit Price Calculator
Compare product prices per unit to find the best value. Calculate unit prices for 2 or up to 5 products, estimate bulk savings, and see how much you save per year. Works with any currency.
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How to Use This Calculator
Tab "Compare 2 Products"
Enter the price and quantity for each product, then select the same unit (e.g., litres, grams, count). The calculator shows the unit price for each, highlights the winner, and estimates savings per unit. Optionally enter your annual consumption to see yearly savings.
Tab "Compare Up to 5"
Add up to 5 products with their price, quantity, and unit. The calculator ranks them from lowest to highest unit price, highlights the best value, and shows how much cheaper it is compared to the worst option.
Tab "Bulk Savings"
Enter the regular size and bulk size for the same product. The calculator compares unit prices, shows savings per unit and per year (based on your purchase frequency), and tells you the break-even quantity — how many regular-size units the bulk price equals.
The Formulas
Unit Price = Total Price / Quantity
Savings per unit:
Savings = Higher Unit Price − Lower Unit Price
Savings percentage:
Savings % = (Savings per Unit / Higher Unit Price) × 100
Annual savings:
Annual Savings = Savings per Unit × Units Consumed per Year
Bulk break-even:
Break-even Quantity = Bulk Price / Regular Unit Price
All calculations are universal. No country-specific taxes or pricing data are applied. Results are estimates — actual savings depend on store pricing and promotions.
Worked Examples
Example 1 — Detergent: 1L at $8.99 vs 2.5L at $18.49
You need laundry detergent and the store has two sizes. Which is the better deal?
The 2.5L bottle saves $1.59 per litre — a 17.7% discount. Over a year of buying 12 litres, that adds up to $19.13 in savings.
Example 2 — Coffee pods: 10-pack vs 36-pack vs 60-pack
Three pack sizes of the same coffee pods. Which is the best value?
The 60-pack has the lowest unit price at $0.55 per pod. Compared to buying 10-packs, you save $0.20 per pod — that is $73 per year if you drink one pod a day.
Example 3 — Bulk rice: 5kg at $12 vs 1kg at $3
Is the bulk bag of rice worth it?
The 5kg bag saves $0.60 per kg — a 20% saving. If you buy rice monthly, that is $36 per year. The break-even point is 4 kg: as long as you use more than 4 kg before the rice goes bad, the bulk bag is the smarter buy.
Understanding Unit Pricing
What Is Unit Pricing?
Unit pricing shows the cost per standard unit of measurement (per gram, per litre, per count). It strips away package size differences so you can compare products on equal footing. Many supermarkets display unit prices on shelf labels, but they are often in small print and may use different units for similar products.
When Does Bulk Not Save Money?
Bulk is not always cheaper. Watch out for: sales on smaller sizes that temporarily beat the bulk unit price, spoilage if you cannot use the product before it expires, and store-brand vs name-brand where a smaller store-brand item may have a lower unit price than a bulk name-brand product.
Comparing Across Brands
Unit pricing works best when comparing the same or similar products. Comparing premium organic coffee to budget instant coffee by unit price alone ignores quality differences. Use unit pricing as one factor in your decision alongside quality, ingredient lists, and personal preference.
Unit Pricing and Groceries
Research shows that shoppers who compare unit prices save 10–30% on groceries. The biggest savings come from staples you buy repeatedly: rice, pasta, cleaning products, toiletries, and beverages. Even small per-unit savings compound into meaningful annual totals.