Free · Everyday calculations

Price per Gram & Multipack Comparison

Compare prices per gram for single quantities or equal-weight multipacks, with other mass units and reverse calculations.

  • Formula & worked example
  • Private in your browser
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Calculator inputs

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How to use this calculator

  1. Enter the known values in the units shown. Results update as you type.
  2. Where results are editable, change one to solve backwards. Lock a value to hold it fixed.
  3. Use the worked example to check the method. Reset restores the starting fields.

Private by default

Inputs and results stay in this browser tab. Bookify does not upload or store the values you enter.

Formula and method

A four-gram quantity costing 12 has unit price 3. A ten-gram quantity costing 20 has unit price 2. In multipack mode, divide total cost by both mass per item and item count.

Price per mass unit = total price ÷ (mass per item × number of items)

Worked example

Enter these known values and leave the other values blank.

Option A mass (per item for multipacks)
4 g
Option A total price
12 USD
Option B mass (per item for multipacks)
10 g
Option B total price
20 USD
Option A price per mass unit
3 USD / g
Option B price per mass unit
2 USD / g
Absolute price difference per mass unit
1 USD / g

Assumptions and limitations

  • Mass is positive. A multipack contains a positive whole number of equal-mass items. Enter the entire pack price.
  • For a single quantity, enter its total mass. For a multipack, enter mass per item and item count.
  • All prices must use the same currency; currency labels do not perform exchange conversion.
  • The comparison concerns price per mass unit. It does not estimate total savings, product quality, usable yield or delivery charges.

Common questions

How do I compare multipacks?

Select multipack mode and enter mass per item, number of items and the total pack price for each option.

Are ounces fluid ounces?

No. These are mass units. Volume-based fluid ounces require a separate comparison.

References

Bookify requires positive mass and whole item counts and nonnegative prices for unit-price comparisons. Single-quantity mode uses exactly one item even after a multipack count was entered; hidden counts no longer change the unit price. Multipack mode retains its entered count and inverse calculations.

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