About CalcBox
CalcBox is a free hub of online calculators built to make everyday math effortless — for students, professionals, and anyone who needs a quick, reliable answer.
Our mission
We believe accurate, fast tools should be free and accessible to everyone. Whether you are planning a mortgage, tracking your fitness, helping a child with homework, or converting units for a recipe, CalcBox gives you instant answers with clear explanations of how each result is produced.
What we offer
- Finance: mortgage payments, personal loans, compound interest projections.
- Health: Body Mass Index (BMI), Basal Metabolic Rate (BMR), body fat percentage.
- Math: percentages, fractions and other everyday operations.
- Conversions: length, weight and temperature units.
Every calculator includes the formula it uses and a short note about when the result is most useful, so you understand the number — not just see it.
How we work
All calculations run locally in your browser. The values you type are never uploaded to a server, never stored, and never shared. We only collect anonymous traffic statistics to understand which tools are most useful and to keep improving them.
Editorial standards
Each formula is cross-checked against authoritative public sources (e.g. WHO for BMI, standard amortization formulas for mortgages). Our calculators are educational tools and do not replace advice from a qualified financial advisor, doctor, or other professional.
Contact
Found a bug, want a new calculator, or have feedback? Reach us at contato@calcboxapp.com or via our contact page.