What is a scientific calculator?

Our Scientific Calculator is a powerful tool that performs complex mathematical calculations and functions. Effortlessly convert units, currencies, and more with our comprehensive range of simple to use conversion calculators! Here are just a few, make sure you check our all the others we have to offer!

Who invented the calculator?

Online-Calculator.com has been around since 2007! That's a long time! The original calculator was invented in the 17th century by a Frenchman called Blaise Pascal! He was just 18 years old, and wanted to help his father do his tax calculations. Join us on the fascinating history of the calculator!

What is a free tax calculator?

Our free tax calculator tool is meant to help you estimate how much you might expect to either owe in taxes or receive as a refund when filing your tax return. It uses the information you provide — such as your income, filing status, age, taxes withheld, and additional deductions or credits you plan to claim — to arrive at a rough estimate.

How do I calculate taxable income?

To estimate your taxable income, we take the gross income entered into the “income field” and then subtract applicable tax deductions and adjustments, such as 401 (k) contributions, HSA contributions, and your standard or itemized deductions, among other factors, to determine taxable income.