How much costs some unknown quantity of the product, if we know the price for other quantity? Let’s calculate the price for the volume B in proportion to the known value of the volume A.

Calculator of proportions:

Calculation accuracy:
Decimal places: 2

Examples of calculations of direct proportionality:

Inverse proportionality:

This is a calculator of proportionality. Upon calculation of direct proportion it founds the unknown from the ratio:
Volume A = Volume B
Price for Volume A Price for Volume B
We can also calculate the inverse proportionality:
Price for Volume A = Price for Volume B
Volume A Volume B
Formula for calculating proportion: 
Price B = Price A × Volume B
Volume A
Формула расчёта обратной пропорции: 
Volume B = Volume A × Price A
Price B

TODO: Ещё здесь будет позже: