Calculators
Free online calculators for everyday math. Fast, accurate, no signup required.
BMI Calculator
Calculate body mass index with metric or imperial units
Loan Calculator
Monthly payments, total interest, amortization
Compound Interest
See how your investments grow over time
Percentage Calculator
Find percentages, ratios, and percentage change
Date Difference
Days, weeks, months between two dates
Tip Calculator
Calculate tip and split the bill
Age Calculator
Exact age from birthdate with next birthday countdown
Discount Calculator
Sale price and savings from any discount
Calculators — FAQ
Are these calculators free to use?
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Yes, all calculators on FreeBoxTool are completely free with no account or subscription required. They run entirely in your browser, so your inputs are never sent to any server.
How accurate are the calculations?
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All calculators use standard mathematical formulas and JavaScript's 64-bit floating-point arithmetic. Results are accurate to at least 10 significant figures for most inputs. For financial planning, always cross-check with a qualified financial advisor.
Can I use these calculators on a mobile device?
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Yes. All calculators are fully responsive and work on smartphones, tablets, and desktop computers. No app download or installation is needed.
Do the financial calculators account for taxes?
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The loan and compound interest calculators compute pre-tax figures. Tax treatment of interest, investment gains, and loan costs varies significantly by country and personal situation. Consult a tax professional for personalized advice.
Which calculator should I use to figure out a sale price?
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Use the Discount Calculator to find the final price after a percentage discount. Use the Percentage Calculator if you need to determine what percentage off an item is, or to find what percentage one number is of another.