Calculators
12 toolsPractical calculators for everyday life and finance. Compute BMI, age in years/months/days, mortgage payments, loan totals, percentages, tips, GPAs, discounts, and compound interest — all in your browser.
BMI Calculator
Free BMI calculator with WHO categories, Asian-adjusted thresholds, and healthy weight range for your height. Supports metric and imperial units.
Age Calculator
Free age calculator: see your exact age in years, months, days, weeks, and hours. Calculates days until your next birthday. Pick any reference date you like.
Percentage Calculator
Free percentage calculator. Find X% of Y, percent change between two values, percent increase/decrease, and reverse-percentage problems in one tool.
Tip Calculator
Free tip calculator with bill-split between any number of people. Choose tip %, round up to the nearest dollar, and see each person's share instantly.
Mortgage Calculator
Free mortgage calculator with monthly payment, total interest, and 15- vs 30-year breakdown. Includes 28/36 affordability rule. Private — no upload.
Loan Calculator
Free loan / EMI calculator for car, personal, and student loans. See monthly payment, total interest, total cost, and prepayment savings instantly.
GPA Calculator
Free GPA calculator on the standard US 4.0 scale. Weighted by credit hours. Supports A through F with +/- modifiers. Add or remove courses live.
Discount Calculator
Free discount calculator: enter original price and discount %, see sale price and amount saved. Add tax to get the final out-the-door price.
Compound Interest
Compound interest calculator with monthly contributions, custom frequency, and year-by-year growth. See how investments compound toward retirement.
Unit Price
Unit price calculator — compare the cost per ounce, gram, or item across package sizes to find the cheaper deal. Free, instant, and no signup required.
Time Card
Free time card calculator with lunch breaks, overtime (1.5× and 2×), and biweekly periods. Total hours and gross pay, auto-saved in your browser.
Scientific Calculator
Scientific calculator online with trigonometry, logarithms, exponents, roots, and memory functions — free, instant, and works right in your browser.
Free online calculators for everyday math
A calculator turns a question you can ask in plain language — "what's 15% of this bill?" or "how old am I in days?" — into an exact number in a fraction of a second. The tools in this category cover the arithmetic that comes up in ordinary life: splitting a restaurant tab, working out a monthly mortgage payment, tracking a semester grade, or checking whether the larger box of cereal is really the better deal. None of them need an account, and every figure is computed right in your browser, so the numbers you type stay on your device.
Real-world jobs these tools handle
Most people reach for a calculator when a decision hangs on a number. Before signing a loan, you want to know the true monthly cost and how much interest you'll pay over the full term. When you're paid hourly, a time-card tool tallies your week without the rounding mistakes that creep in on paper. Shoppers use percentage and discount tools to confirm that a "40% off" sticker matches the price at the till. Students lean on a GPA calculator to see how one course will move their average. Each task is small, but getting it wrong can cost real money or a real grade.
Estimates, not professional advice
It's worth being honest about what these results mean. A mortgage or compound-interest figure is an estimate built from the inputs you provide; it doesn't include every fee, tax, insurance cost, or rate change a lender might apply, so treat it as a planning aid rather than a quote. A BMI number is a rough screening value, not a diagnosis, and it doesn't account for muscle mass, age, or build. Use these tools to understand the shape of a decision, then confirm anything that matters with a qualified financial advisor, lender, or healthcare professional before you act on it.
How to choose the right calculator
Start with the unit of the answer you need. If you want a payment, pick the mortgage or loan tool; if you want a ratio or a "what percent" answer, the percentage tool is the fastest route. For anything involving money over time, the compound-interest tool shows how small rates grow across years. Double-check that your inputs use the same units and time period the tool expects — mixing a monthly rate with an annual term is the most common source of a wrong result. When in doubt, run the numbers twice with slightly different assumptions to see how sensitive the outcome really is.