On the shelf, bulk vs small pack and labels like 500 g vs 1 kg confuse sticker price with value. Compare unit price (price ÷ net amount). Enter two items with different units per side—g↔kg and mL↔L convert automatically before picking the cheaper per-unit option.
The formula
Unit price = price ÷ quantity. Example: $7.49 for 1 kg vs $4.99 for 500 g—the tool converts kg to grams and compares cents per gram without manual math.
Do units have to match?
No. 500 g on one side and 1 kg on the other is a normal use case. Do not mix kinds (grams vs milliliters) unless you know the products are comparable (e.g. same liquid labeled consistently).
When the lowest unit price still isn’t the best buy
Brand, promos, loyalty pricing, BOGO, tax/shipping basis, and expiry deals can beat bulk on math alone. Use the same tax/shipping basis on both sides.
Use cases
Grocery aisles, refill pouches, multi-roll paper goods, sanity-checking “per kg” marketplace listings. For three SKUs, compare pairwise.
Related
Tip calculator, GPA, everyday hub.
Frequently asked questions
How is unit price calculated?
Unit price = price ÷ quantity. Compare both; the lower number is cheaper per unit if quality matches.
How do I compare 500 g vs 1 kg?
Enter each pack’s price and amount—e.g. 500 g on A and 1 kg on B. The tool converts 1 kg to 1000 g and compares price per gram for you.
Can I compare different units?
Yes—pick units per side. g↔kg and mL↔L convert automatically within the same kind. Do not mix mass (g) with volume (mL) unless you know the product is comparable.
Is bulk always cheaper?
Not always—promos or clearance can beat bulk. This tool compares math only.
Compare three or more products?
Two items at a time—pairwise comparisons or normalize net content first for many SKUs.
Prices with tax?
Use the same basis (both with or without tax) on both sides.
Buy-one-get-one promos?
Convert the promo to total paid ÷ total quantity first—this page compares two simple price/qty pairs.
Price per kg listings?
Cross-check marketplace per-kg labels; watch shipping and member pricing.
How to compare small vs bulk packs fairly?
Use price ÷ net content, not sticker price alone. Small pack in grams vs bulk in kg is fine—the page converts. Promos and clearance can still beat bulk on math alone.
Can I compare mL and grams?
Usually no—volume (mL) and mass (g) are different kinds. Compare liquids using the same kind of label (both mL or both g) on comparable products.
Can I save my inputs?
Yes. Copy link below the form keeps your current inputs so you can share the scenario or save it for later.