It is a free app that can automatically calculate the total amount by taking a note of the product name and amount.

You can easily check the total amount when purchasing multiple items at shopping.
You can also change the units, so you can calculate the total weight and length.

If you purchase more than one of the same product, you can switch between displaying and hiding the quantity setting.
You can easily check the total amount by entering only the amount.

The entered list can be saved with a name, so you can check it later or compare multiple lists.

[List of Units]
Price: dollar
Length: meters, centimeters, kilometers
Weight: grams, kilograms
Qty: pcs
Volume: liters, milliliters