Best Free Online Calculators
A hand-picked shortlist of the 10 calculators people reach for most, gathered on one page so you can jump straight to the best one. Pick from age, BMI, loan, mortgage, savings, discount, salary after tax, date difference, calories, and percentage — each opens instantly in your browser with no sign-up.
Free Age Calculator – Find Your Exact Age in Seconds
Enter your birthdate and get your exact age broken down to years, months, weeks, days, hours, and minutes — instantly and for free.
Free BMI Calculator – Check Your Body Mass Index Online
Enter your height and weight to calculate your Body Mass Index (BMI) and find out which health category you fall into — metric or imperial units supported.
Calorie Calculator – Daily Caloric Needs by Age, Weight & Activity
Find out exactly how many calories you need each day based on your body stats and activity level — for weight loss, maintenance, or muscle gain.
Date Difference Calculator – Find Days Between Any Two Dates
Calculate the precise difference between two dates in days, weeks, months, and years — great for deadlines, anniversaries, project durations, and age checks.
Free Discount Calculator – Find Sale Price & Savings Instantly
Enter the original price and discount percentage to instantly see the sale price, how much you save, and the final amount to pay.
Free Loan Calculator – Monthly Payment & Total Interest
Find out your exact monthly loan repayment, total interest paid, and overall cost. Works for personal loans, auto loans, and any fixed-rate borrowing.
Free Mortgage Calculator – Monthly Payment, Interest & Total Cost
Estimate your monthly mortgage payment — including property tax and insurance (PITI) — and see a full amortisation schedule for any home loan.
Free Percentage Calculator – Find %, Increase & Decrease
Solve any percentage problem in seconds — find a percentage of a number, calculate percentage change, or discover what percent one value is of another.