budget sheet formula

a novice here
i am in need a formula for a debt management budget sheet i am working on.
im looking to make it as automated as possible.
so i am looking for the user to input a figure in box one
and get a calendar month figure in box three
so in box two it will need to be a drop down of weekly, monthly, or annually of how the credit/debt is come by.

when they check the relevant frequency from a drop down it will then have a formula to work out the relevant maths.

can anyone help with this or know to a template i could use as reference?

all help gladly received.

Welcome to the forum! Almost everyone here needs formula help. Please take a moment to re-read forum rule #1 and then amend your thread title to something that better explains your problem. Changing your thread title is not optional, which means you must change it. Thanks!

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Will you please attach a sample Excel workbook?

1. Make sure that your sample data are REPRESENTATIVE of your real data. The use of unrepresentative data is very frustrating and can lead to long delays in reaching a solution.

2. Make sure that your desired results are also shown (mock up the results manually).

3. Make sure that all confidential data is removed or replaced with dummy data first (e.g. names, addresses, E-mails, etc.).

4. Try to avoid using merged cells as they cause lots of problems.

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