Savings, payback and comparisons

Payback periods, savings estimates, and side by side comparisons of two options.

18 calculators7 categories
A stack of coins, a rechargeable battery cell, a small solar panel and a folded bill on a grey desk

Is it worth it?

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How this collection is put together

Each calculator is placed in a collection by the question its title answers, not by a hand-assigned tag, so renaming a tool moves it between collections. The groups deliberately overlap: a payback calculation answers both a cost question and a savings question. Every calculator names the formula it uses, the units it expects and the assumptions behind the result, so you can check the working instead of taking the number on trust.

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