Skip to content
ENExplore Calculators

Best Buy Unit Price Calculator

Work out best buy unit price instantly with clear inputs, formula shown and shareable results.

About Best Buy Unit Price Calculator

Comparing pack sizes fairly means reducing each to a price per unit: price divided by size. The lower unit price is the better buy, assuming you will use the whole pack.

Formula

Unit price

unit price = price / size

Worked example

With the default values below, Best Buy Unit Price Calculator returns Better buy of Option B is cheaper per unit. Change any input above and every figure here is recalculated in your browser.

Inputs used

Price of option Aminimum 0
3.5
Size of option Aminimum 0
500
Price of option Bminimum 0
6.2
Size of option Bminimum 0
1,000

Results

Better buy
Option B is cheaper per unit
Unit price of A
0.00700000
Unit price of B
0.00620000
Saving of the cheaper option
11.4286 %

Step by step

  1. 1Values used
  2. 2Unit price
  3. 3Better buy= Option B is cheaper per unit
  4. 4Unit price of A= 0.00700000
  5. 5Unit price of B= 0.00620000
  6. 6Saving of the cheaper option= 11.4286 %

Assumptions and limits

  • The result is derived only from the 4 inputs listed above. Anything not among them is not part of the calculation.
  • In particular, this calculator does not take inflation, tax, fees or charges or compounding frequency into account.
  • Figures are rounded for display to 8 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.

How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.

Frequently Asked Questions

3.50 for 500 versus 6.20 for 1000?

0.007 versus 0.0062 per unit, so the larger pack is about 11.43% cheaper per unit.

Is the cheapest unit price always best?

Only if you use it all. Waste from an oversized pack can easily outweigh the per-unit saving.

Related Calculators

Best Buy Unit Price Calculator | Calcrivo