Quantity information for products on Amazon is mostly unavailable, leaving you to figure out unit prices. In order to get you useful unit prices for comparison, ByTheUnit does a few special things before it displays a neatly sorted list of results:

1. Return accurate search results from Amazon, identifying if each item is prime-eligible.
2. Run the results through our custom unit-price engine which interprets the item description to pull out quantity and units, making sure we account for the hundreds of different ways an item could be described.
3. Use measurement conversions to normalize units for price comparisons, when possible.