SmartCalc: fast online calculators
Fast, mobile-friendly tools that load instantly. Pick a calculator below.
Percentage calculator online Find X% of Y, percent change, and “X is what % of Y”. Age calculator by date of birth Calculate age in years, months and days (DOB → today). GST calculator online (India) Add/remove GST at 0%, 5%, 12%, 18%, 28%. EMI calculator online Monthly EMI, total interest, and total payable amount. Compound interest calculator Future value, interest earned, and growth over time. Date difference calculator Days between dates + weeks breakdown. Discount calculator Percent off, sale price, and savings. BMI calculator Body Mass Index (metric + imperial) with category.