Cost Calculator

When there is an option to choose Vol life, is there a calculator that can calculate how much would come out of their pay? We’ve added in a formula to be able to calculate it but wanted to know if there was a better way (aka a cost calculator) to be able to do the math for them. So they can just plug in how much vol life they want, their age, and it would tell them how much to expect to come out of their pay.

TYIA!