About GrownUpMath

What We Do

GrownUpMath is a collection of free calculators for the math that matters in everyday life. Personal finance, income, shopping comparisons, and home decisions — the calculations you actually need as an adult but were never taught in school.

We cover compound interest, salary conversion, credit card payoff, loan amortization, tip splitting, fuel costs, recipe scaling, and more. Each calculator includes clear explanations of the math and the reasoning behind the numbers.

Why We Built This

School teaches algebra and calculus but not compound interest or take-home pay. Most online calculators are either too simple to be useful or buried behind "get a quote" forms that funnel you to a sales team. We wanted tools that give you a real answer, instantly, with no strings attached.

Every calculator on GrownUpMath runs entirely in your browser. Your salary, savings, debts, and spending never leave your device. There are no accounts, no data collection, and no hidden agendas.

Our Standards

Content on GrownUpMath is written to inform, not to sell. We explain the math, show the trade-offs, and let you draw your own conclusions. We do not promote specific financial products or services. When regulations, tax brackets, or standard practices change, we update our tools accordingly.

Important Disclaimer

GrownUpMath provides educational tools and general information. We are not financial advisors, accountants, or tax professionals. Calculator results are estimates based on the inputs you provide and standard formulas. Always consult a qualified professional before making significant financial decisions. See our full terms & disclaimer for details.

Contact

Found a bug, have a suggestion, or just want to say hello? Visit our contact page.