Given that the calculation that you wish to share is intended to be merely read an understood by the recipient, there is no requirement for them to have access to the actual logic that performs the calculation.
Is there any specific reason that you cannot simply include the calculation in prose? You mention Price in your question, which suggests that the calculations you are talking about are invoices/quotations/estimates etc, which most people are quite happy to read in a simple table, without any requirement to want to alter the numbers to recalculate different results:
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The above is prefectly readable, and give a little justification help for the numbers (which Markdown formatting isn't much help with on this site) would suit most people if mere understanding is your aim.
Depending on what medium you are providing the price in (email, Pages document, simple TextEdit file) there may even be tools that will perform the calculations for you at your end (for example inserting a spreadsheet into a pages document instead of a table) but may just be plain text when it reaches your recipient.
If your calculation is so complex that it cannot be layed out in such a simple form then you can still provide a seperate page of information that is the output from a spreadsheet, or you can use an itemised billing schedule that prices items and allows then to work it out for themselves.
Now, about these overdue Reputation points... ;)