Free Online Calculators

Percentage, scientific, fraction, BMI, age, GPA, loan, mortgage, EMI, discount and VAT calculators. Instant answers in your browser, no sign-up.

9 tools

Age CalculatorCalculate your exact age in years, months and days from your date of birth, on today or any date. Plus next bi CGPA to Percentage CalculatorConvert a 10-point CGPA to a percentage with the CGPA × 9.5 formula (or your university's own rule), and perce VAT CalculatorAdd VAT to a net price or work out the VAT inside a gross price at any rate, with net, VAT and total for invoi Discount CalculatorFind the sale price and how much you save after a percentage off, stacked coupons and tax, or the discount % b Tip CalculatorCalculate the tip and total for any bill, split it between any number of people and round the total or each sh Date CalculatorCount the days, weeks, months and business days between two dates, or add or subtract days, weeks, months and Pregnancy Due Date CalculatorEstimate your baby's due date from your last period, conception or IVF transfer, and see your current week, tr Dog Calorie CalculatorFind how many calories your dog needs a day from its weight in pounds or kilograms, life stage and activity, a Cat Calorie CalculatorWork out how many calories your cat needs each day from its weight, age and lifestyle, then see how many cups

About Calculators

Get the number you need without doing the math

How old am I in days? How much is 20% off? What tip do I leave on this bill? These free online calculators answer everyday questions about dates, school, shopping and pregnancy instantly, in your browser. Type your numbers and read the result.

Dates and time

Age: the age calculator gives your exact age in years, months and days from your date of birth.
Between two dates: the date calculator counts days, weeks, months and business days, or adds and subtracts days from a date.
Pregnancy: the due date calculator estimates the due date from the last period, conception or an IVF transfer.

Shopping and bills

The discount calculator shows the sale price and your saving after a percentage off or stacked coupons. The VAT calculator adds VAT to a net price or finds the VAT inside a gross price at any rate. At the restaurant, the tip calculator works out the tip and total and splits the bill between any number of people.

School

Turn a 10-point CGPA into a percentage with the CGPA to percentage calculator, which uses the CGPA × 9.5 formula or your university's own factor.

To change units rather than do sums, use the unit converters.

Tips

Check whether a price already includes VAT or sales tax before you work out a discount.
Ask your university which CGPA formula it uses; the 9.5 factor is common but not universal.
A due date is an estimate: most babies arrive in the weeks around it, not on the day.