Free, fast and private calculators, work out BMI, age, percentages and more right in your browser. No sign-up.
ToolBrainy's calculator collection covers the numbers that come up most often in daily life and work. There are tools for health metrics (BMI and age), everyday math (percentages, discounts, tips), financial planning (loans, mortgages, EMI), career decisions (salary conversions), long-term saving (retirement projections), and travel costs (fuel). Every tool runs entirely in your browser — no account, no data stored, no results sent to a server. Enter your numbers and get an answer instantly.
Each calculator shows not just the result but the formula or breakdown behind it, so you can check the arithmetic or explain the answer to someone else. The financial calculators (loan, EMI, mortgage, retirement) include detailed breakdowns — amortization schedules, year-by-year projections, principal-versus-interest splits — that give you the full picture, not just a headline number.
Homebuyers and borrowers use the Mortgage and Loan calculators before applying — checking whether a monthly payment fits their budget, comparing 15-year versus 30-year terms, or modelling how a larger down payment cuts total interest. The EMI calculator is widely used across South and Southeast Asia for the same pre-application planning on home, car, and personal loans.
Shoppers and diners use the Discount Calculator to verify that a sale price is as good as it looks, the Tip Calculator to split a restaurant bill fairly across a group without doing mental arithmetic, and the Percentage Calculator to quickly convert a fixed-amount saving into a percentage — or the other way around.
Job seekers and freelancers use the Salary Calculator when comparing offers quoted in different pay periods — turning a monthly salary into hourly or an hourly rate into annual — and when setting freelance rates that match a target income. The Retirement Calculator sits alongside it: once income is clear, it shows what monthly contributions are needed to reach a specific nest egg by a target age.
Drivers and commuters use the Fuel Cost Calculator to budget road trips, work out the actual daily cost of commuting, and compare the fuel saving between two vehicles on the same route. Supporting over 60 currencies and four fuel-economy units, it is useful wherever you are in the world.