Need to change value multipling by other value

Hello,

i have custom fields which take places in the feed.

For example: acf field named filled_amount. That´s minimal value of goods you can buy. filled_amount = 2,05 (meter), so customere can´t buy smaller amount of that.

With this field isn´t any issue, but i need change price by multipliing it by this value (both dynamically). Can´t do it with rule, because these vaules change product from product.

Is there any possibility to do that?

Thank you