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# Help converting a formula to an equation

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## Help converting a formula to an equation

(OP)
I'm trying to figure out what the equation would look like in Excel Equation Editor for a particular formula. I can write it in Excel but was never good at rearranging an equation to solve for other variables.
Attached is a short spreadsheet with the information. The formulas use "Named" references and the notations are in column D, with the associated values in Column C.

The solution to the equation I'm trying to write, is in C19 (Ca). The other equation that needs to be rearranged is in the spreadsheet and the solution for that equation is in cell C12 (Qa)

### RE: Help converting a formula to an equation

hi,

You already have the Excel formula (Ca). So all you need to do is substitute the formulas for S & So. All your other variables are constants.

Skip,

Just traded in my OLD subtlety...
for a NUance!

### RE: Help converting a formula to an equation

Divide both sides by Ve*2.303*(So/S).
Raise 10 to the power of the result on both sides.
Divide both sides by 100.
Invert both sides
Subtract 100 from both sides.
Negate both sides.

### RE: Help converting a formula to an equation

Just use a subroutine
Function GetFormula(cell)
GetFormula = cell.Formula
End Function
and then type in the cell GetFormula('cell reference')

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