About ledger365

ledger365 is a set of 59 small tools for the calculations and conversions people look up most often: loan repayments and mortgages, GPA and admission aggregates, unit conversions, word counts, formatted JSON, resized images.

How it works

Every tool is JavaScript running in your own browser. There is no server doing the work, which has three consequences worth knowing about. The tools are fast, because nothing travels over a network. They keep working if your connection drops. And nothing you type — a salary, a photo, an API payload, a generated password — can be read by us, because it never leaves your device.

Accuracy

The formulas behind each tool are documented on its own page, so you can check the method rather than trusting the number. That said, these are general-purpose calculators: they do not know your lender's fee schedule, your university's exact grading table or your country's tax bands. Treat every result as a well-informed estimate, and confirm anything consequential with the institution involved.

Contact

Corrections and requests for new tools are welcome at aliakberntu1@gmail.com. If a formula looks wrong, say which tool and which figure and it will be checked.