Please could somebody help me troubleshoot this formula?

I’m building a financial forecast and have a number of new business opportunities to build in. Not all opportunities have the same probability of converting into a sale however so I need to create a weighted value for each opportunity to give me a more realistic view of what my pipeline value is. The calculation needs to be Contract Value x Probability = Weighted Value, however I’m struggling to work out how I incorporate the multiple options into my formula.

I have 6 probability options in total:

100%

75%

50%

30%

10%

Lost (0%)

If anyone could offer some advice, that would be much appreciated! Thank you.

Your formula in {Weighted value} would then just be {Contract value}*{Probability}

If you still need {Probability} to be a single select field (so that users can only enter pre-set options, instead of any figure, you can do this and then just add a formula field that renders {Probability} as a number, and use that for your formula. Airtable might always recognise the content of single select fields as actual numbers that can be used in calculations.