Why ProsperMath exists
Financial decisions often begin with a simple question: what could this become, how long might it take, or which option appears stronger under the same assumptions? ProsperMath turns those questions into interactive estimates that can be changed and compared.
The site does not recommend products, manage money or provide personal financial advice. Its purpose is to make the mathematics visible so that users can ask better questions.
Our principles
- Useful before impressive: every calculator should answer a recognisable question.
- Assumptions in plain sight: rates, periods and limitations should be easy to find.
- Private by default: calculations run in the browser and no account is required.
- Honest uncertainty: projected returns are illustrations, not forecasts.
Financial information deserves care
Money decisions can have lasting consequences. Check important figures with your provider, lender, tax authority or a suitably qualified professional before acting. Investment values can fall as well as rise, and tax treatment depends on individual circumstances.