Free Online Calculators – Age, BMI and Everyday Maths

Find out exactly how old you are in years, months and days, or check your age on a form's cut-off date. It also counts down to your next birthday and tells you the weekday you were born.

Work out body mass index from height and weight in metric or imperial units with this BMI calculator. A colour-coded scale shows your category, and WHO cut-offs for Asian populations are available as an option.

Solve everyday percentage problems, from finding 15% of a price to working out what percent one number is of another. It also measures percentage change and adds or removes a percentage in a single step.

Estimate a monthly loan instalment with an EMI calculator that shows total interest and the principal-to-interest split. A yearly and monthly repayment schedule can be downloaded as CSV for Excel or Google Sheets.

Add GST to a net price or strip it out of a gross amount, with presets for India's slabs and Pakistan's 18% sales tax. Indian results can be split into CGST and SGST or shown as IGST.

Total up cash, gold, silver, business stock and investments with a zakat calculator that checks your wealth against the nisab. Gold and silver can be entered in tola or grams and valued at today's price.

Count the exact years, months and days between two dates, along with total weeks, days and hours. Weekday and weekend counts help with rough working-day estimates, and you can add or subtract time from any date.

Find the sale price and your savings with a discount calculator that also works backwards to the original price. Stack up to four discounts in a row and add sales tax, VAT or GST to the final total.

Work out a tip with one-tap presets or your own percentage, then split the bill between any group size. Each share can be rounded up to a whole number, and the tip can be based on the pre-tax amount.

Convert pay between hourly, daily, weekly, fortnightly, monthly and yearly figures with this salary calculator. Set your own hours and days to cover part-time work or a four-day week; all results are gross pay.

Calculate a credit-weighted GPA for one semester or your cumulative CGPA across several. Choose the US 4.0 scale, the common Pakistan HEC table or a custom grading scale of your own.

Estimate a due date from the first day of the last period, the conception date or an IVF transfer date. It shows how many weeks along the pregnancy is today and lists milestones such as the 20-week scan window.

Project how savings grow with a compound interest calculator that handles yearly to daily compounding and regular deposits. A year-by-year table and bar chart separate the money you add from the interest earned.