For my more routine analysis of LOE/budget, where it is mostly a straightforward summation, I have a template spreadsheet that I just reuse. For more complex ca

For my more routine analysis of LOE/budget, where it is mostly a straightforward summation, I have a template spreadsheet that I just reuse. For more complex cases, I hand write the equations and error-propagation into a custom sheet. A little time intensive, but it gives me an excuse to practice multi-variable calculus.