Unit Price Comparison
See which pack is a better deal: larger or smaller
Product A
First option to compare
Product B
Second option to compare
🛒 Why compare unit prices
Shelves often show packs of different sizes — 900 g instead of 1 kg, 750 ml instead of a liter. Comparing shelf prices alone is misleading: the better deal is the one with the lower cost per the same unit of weight or volume.
The calculator converts both products to a common basis — “per 1000 units” — and shows which is cheaper and by how many percent.
📐 Formula
Price per 1000 units (g, ml, kg, or l — both products must use the same units):
The lower value wins.
💡 Example
Product A: 150 for 900 g → 150 / 900 × 1000 = 166.67 per 1 kg
Product B: 160 for 1,000 g → 160 / 1000 × 1000 = 160 per 1 kg
Product B is about 4% cheaper per unit of weight, even though its shelf price is higher.
✅ Tips
- Enter weight or volume in the same units for both products — grams with grams, liters with liters.
- Use the net amount on the pack, not the outer package size including packaging.
- A larger pack is not always cheaper — recalculate before buying, especially during sales.
- The calculator works well on a phone while you shop.