How to calculate VAT on an invoice
Learn how to move from a net price to a total and how to recover the net when VAT is already included.
Read the guideGuides for getting things done
Understand it. Solve it in a minute.
Practical ideas about money, data and work. Each guide ends with a tool you can use to put it into practice.
Compound interest: what it is and how to calculate it
See the formula, the effect of time and the difference between what you contribute and what growth adds.
Read the guideDebt snowball vs avalanche
Compare the method that builds psychological momentum with the one that usually cuts interest first.
Read the guideHow to convert an hourly wage to an annual salary
The quick calculation, the assumptions behind weeks and hours worked, and why gross is not take-home pay.
Read the guideCommon JSON errors and how to fix them
Trailing commas, single quotes and unquoted keys: find the mistakes that break your data.
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