Compare net unit prices
Compare named offers with price and positive net quantity. Normalize only within one dimension; show all exact ties. No legal price-label check.
- Runs in your browser
- No upload
- Check before download
Compare named offers with price and positive net quantity. Normalize only within one dimension; show all exact ties. No legal price-label check.
Calculations run locally and inputs are not saved automatically. Download an input backup before closing the tab. Input data, formulas and filenames are never sent. Only with your optional consent, Refentra sends aggregate counts of actions and outcomes, without input content.
What are the limits?
Maximum amount 1 trillion units; total 100 trillion cents. Up to 100 rows, 50 people, 20 tiers, 100 depreciation years, 1,200 schedule periods, 61 cash flows. IRR range −99% to 1,000% per interval, numerical candidates only. Rates: up to eight decimals. Backup: 1 MiB. CSV formula-leading text gets an apostrophe. Use decimal points, no thousands separators.
Amounts use two decimals in your stated unit. Exact decimal inputs; cent rounding half away from zero. Table sums balance. Largest fractional remainders receive shared cents; equal remainders use row order. No tax, fees, legal entitlement or current prices are inferred.
Non-monetary values are shown with up to ten significant digits. CAGR, fractional-year inflation and IRR use numerical approximations; IRR candidates are not a symbolic proof. CSV keeps the numeric values before display rounding.
p_u = P/Q; 1 kg = 1000 g = 1000000 mg; 1 L = 1000 mL; 1 m = 100 cm
Calculate with your own assumptions
- Enter the inputs
Add at least two offers, each with a package price, quantity and unit. Compare mass with mass, volume with volume, length with length or counts with counts, and use one currency. Enter decimals with a point and without thousands separators.
- Check a worked example
Offer A: 1.50 EUR for 500 g; B: 3 EUR for 1 kg. A=1.50/0.5=3 EUR/kg; B=3/1=3 EUR/kg. Both are marked best because their unit prices tie.
- Interpret and save the result
Results are normalized to kg, L, m or piece. The smallest exact unit price wins, including ties; the number shown may be rounded. Save the CSV before you compare package sizes elsewhere.
Method, errors and limits
Can I reopen editable inputs from the CSV?
The CSV is a report of the results, not a backup of your inputs. Download the separate JSON input backup before you close the page, then import it into this same tool to edit your assumptions again. Import accepts files up to 1 MiB and checks that the file belongs to this tool. Inputs are not saved automatically.
Which input mistakes should I check?
Quantity must be above zero. Grams and liters can't be compared, because the tool doesn't guess the density. Enter the price of the whole stated quantity, not a unit price that is already normalized.
What are this model’s limits?
2–100 offers in kg/g/mg, L/mL, m/cm or pieces. It compares the prices you enter, not product quality, waste, shipping, live offers or currency exchange.