Smartweb.tools Free online calculators for age, loan EMI, percentage change and number conversions. Get instant results in your browser — no app download needed.

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Calculator Tools — free online tools

Free calculators for everyday financial and mathematical tasks

From calculating your exact age in years, months and days to working out the monthly payment on a loan, our calculator tools give you accurate answers instantly. No app to install, no registration, and all calculations happen inside your browser.

Age Calculator

Enter a date of birth and the age calculator returns the exact number of years, months, days and total days lived up to today. This is useful for checking eligibility for age-restricted services, filling in official forms that require an exact age, and quickly computing ages for legal and medical purposes. The calculation accounts for leap years and correctly handles day and month rollovers.

Loan EMI Calculator

A loan EMI (Equated Monthly Instalment) is the fixed amount you pay each month to repay a loan over its full term. Enter the loan principal, the annual interest rate and the repayment period in months to see the exact monthly payment, the total amount repaid and the total interest cost over the life of the loan. Understanding these figures before taking a loan helps you compare offers from different lenders and choose the most cost-effective option.

Percentage Calculator

The percentage calculator handles five types of percentage problems that come up in everyday work: calculating what percentage one number is of another, finding a percentage of a total, calculating percentage change between two values, increasing a value by a percentage, and decreasing a value by a percentage. Each mode shows the formula being applied so you can verify the logic and use it in reports or presentations.

Binary and Number Base Converter

Convert numbers between decimal (base 10), binary (base 2), hexadecimal (base 16) and octal (base 8). Computer science students and developers use this tool when working with bitwise operations, colour values (which are stored as hex), memory addresses and networking calculations. Enter a number in any base and see all four representations simultaneously.

Number to Words Converter

Convert any number into its English written form. One billion two hundred and thirty-four million five hundred and sixty-seven thousand eight hundred and ninety. This is useful for writing cheques, legal contracts, financial reports and any other context where numbers must be spelled out rather than written as digits.

  • Age Calculator — Calculate age in years, months, days and total days from any date of birth.
  • Loan EMI Calculator — Calculate monthly EMI, total payment and total interest for loan planning.
  • Percentage Calculator — Calculate percentages instantly — find X% of Y, what percentage X is of Y, percentage change, increase and decrease.
  • Random Number Generator — Generate one or multiple random numbers within any range, with an option to exclude duplicates for fair draws and simulations.
  • Number to Words Converter — Convert any number into words in English — useful for writing cheques, legal documents, invoices and financial reports.