My Monthly Math is a small, independent set of financial calculators. Everything runs in your browser — there is no account, no tracking of the figures you enter, and no data leaves your device.
The formulas used are the standard ones taught in finance courses, and each is documented on the page that uses it. Where a calculation depends on an assumption — inflation, expected return, withdrawal rate — that assumption is an input you control rather than a constant hidden in the code.
Contact
Questions, corrections, or a calculator you would like to see added: info@nextpixellabs.com. Corrections to the maths are especially welcome and are acted on quickly.
Editorial policy
This site carries display advertising. Advertisers have no input into the content, the formulas, or the assumptions used, and no calculator result is influenced by any commercial relationship. Nothing here is personalised financial advice.
Accuracy
Every calculator is checked against the closed-form version of its formula. If you find a discrepancy, please report it — it will be fixed and credited.