Free Online Calculators

These calculators cover the everyday arithmetic that is easy to get slightly wrong and awkward to check. Working out an exact age in years, months and days matters for admissions cut-offs and eligibility rules. Percentages split into three different calculations that people routinely confuse, particularly percentage change, where the answer depends on which value is the baseline. Loan EMI figures reveal what a longer tenure genuinely costs once total interest is included rather than just the monthly payment. Date differences underpin notice periods, deadlines and billing cycles, with an option to count working days only. GST calculations run in both directions, and removing tax from an inclusive amount is not the same as subtracting the percentage. Unit conversion handles the persistent gap between metric and imperial. Each calculator shows enough of its working that you can sanity-check the result rather than simply trusting it.