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Work out the number. Then understand what it means.

Free tools for the arithmetic, and plain-English guides for the bits a calculator cannot decide: scope, missing data, trade-offs and what to do next.

Start with a useful number

These are calculators, not recommendations. Inputs and assumptions stay visible so you can challenge the result.

Build a picture you can trust

No miracle ratios and no judgement. Just a repeatable way to organise the facts and see what is missing.