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A set of calculators for the arithmetic that comes up constantly in running a business, and where a small mistake is expensive. Every one runs entirely in your browser, so nothing you type is transmitted or stored, and none of them need an account.
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Straight-Line Depreciation Calculator
Annual depreciation, book value and total writedown
Open calculatorFAQs
Are these tools free?
Yes. Every calculator and the invoice generator are free with no signup and no usage limit.
Is my data sent anywhere?
No. All calculations run in your browser using JavaScript. Nothing you enter is transmitted to a server or stored.
Do I need a DigitXBooks account?
No. The tools are open to anyone. A DigitXBooks account is only needed if you want the figures recorded in a ledger and tracked over time.