Free online calculators
Work out an EMI, compare tax regimes, check a GST amount or convert a CGPA. 37 calculators that open straight away, with no login.
Most money and everyday questions come down to one formula and a few numbers. These calculators do the maths in your browser and show the working where it helps, so you can change one value and see the effect at once.
There are 37 calculators in six groups: loans, savings and investing, tax and salary in India, business and freelance, everyday maths and conversions, and health and study.
Loans and debt
EMI, mortgage and payoff plans.
Savings and investing
SIP, deposits, PPF and goals.
Tax and salary (India)
Income tax, GST, HRA and take-home pay.
Business and freelance
Pricing, rates and getting paid.
- Margin, markup & discountPrice from cost or margin
- Freelance rate calculatorHourly rate from income goal
- Hourly to salary converterHourly, monthly and yearly pay
- Late-payment interestInterest on an overdue invoice
- Currency converterWith your own exchange rate
- Tip & bill splitterSplit a bill between people
Everyday maths and conversions
Percentages, dates, units and costs.
- Percentage calculator% of, % change and more
- Age calculatorExact age in years, months, days
- Date calculatorDays between dates, add or subtract
- Hours to decimal & timesheetFor invoices and payroll
- Trip & fuel cost calculatorFuel cost for a journey
- Electricity cost calculatorRunning cost of an appliance
- Unit converterLength, weight, temperature and more
- Roman numeral converterNumbers to Roman and back
Health and study
Estimates for daily life and grades. Not medical advice.
- BMI calculatorBody mass index
- Calorie & macro calculatorDaily calories and macros
- Running pace calculatorPace, time and distance
- Sleep cycle calculatorWhen to sleep or wake
- Pregnancy due date calculatorEstimated due date
- CGPA to percentage calculatorConvert your CGPA
- Weighted grade & final examWhat you need on the final
Frequently asked questions
Are these calculators free?
Yes. There is no signup and no daily cap. Each calculator is a single page that opens straight away.
Do I need an account?
No. Open a calculator, enter your numbers and read the result. Each tool page explains its own processing details.
Can I rely on the tax and salary results?
Use them to plan and compare. Tax rules change and your own case can differ, so check the official portal or a tax professional before you file.
Do they work on a phone?
Yes, in a modern mobile browser.