The **Purchasing Calculator** computes and compares the price in multiple currencies for two or three commodities measured by weight (mass), volume, area and length.

PRICE COMPARISONS by Length, Area, Volume and Weight, two or three item comparisons:

**Price compare two items by Length :** This function lets you enter the length or distance and price of two items, and the calculator tells you which is the better buy and by how much.**Price compare three items by Length:** This function lets you enter the length or distance of tree items, and the calculator tells you which is the best buy and by how much.**Price compare by Area:** This function lets you enter the area and price of two items, and the calculator tells you which is the better buy and by how much.**Price compare three items by Area :** The function lets you enter the area of tree items, and the calculator tells you which is the best buy and by how much.**Price Compare by Volume:** This function lets you enter the Volume and price of two items, and the calculator tells you which is the better buy and by how much. **Price Compare three items by Volume:** This function lets you enter the Volume and price of three items, and the calculator tells you which is the better buy and by how much. **Price Compare by Weight:** This function lets you enter the weight (mass) and price of two items, and the calculator tells you which is the better buy and by how much. **Price Compare three Items by Weight:** This function lets you enter the weight (mass) and price of three items, and the calculator tells you which is the better buy and by how much.

### Uses for this Calculator

This calculator helps answer questions like the following:

- Which is cheaper? 3.4 pounds for $4.78 (U.S. Dollars), 1.6 kilograms for £5.20 (GBP Pounds Sterling), 420 grams for €2.10 (Euros) or 1.7 kilograms ¥29.32 (Chinese Yuan)?

This calculator makes these and many more calculations trivial by letting you choose your units (length, area, volume, weight and even currency), enter your numbers and get a reliable answer. **NOTE:**All currencies whether input costs or output prices have a default of U.S. dollars (USD). However, the user can automatically convert this via the pull-down menu.

To compute the amount of money or time needed to buy or produce a length, area, volume or weight amount based on the rate, using multiple currencies and base units (e.g. pounds and kilograms), see the **Production Calc.**