Calculator

A free online calculator with a basic mode for everyday sums and a scientific mode for powers, roots, trigonometry, logarithms and factorials.

Free, no sign-upIt works in your browser; nothing you enter is sent to Showtt.Works on phones

Calculation

History

Your calculations will appear here. Tip: you can type with your keyboard and press Enter.

How to use it

Choose Basic or Scientific.
Type with your keyboard or tap the keys. Use brackets to group parts of a calculation.
Press = or Enter to see the answer. Earlier results appear in the history.

Does it use degrees or radians?

Degrees by default. Switch to radians in scientific mode; the setting applies to sin, cos, tan and their inverses.

Why does 0.1 + 0.2 show 0.3?

Results are rounded to 12 significant digits, which removes the tiny rounding errors computers make with decimals.

Percent of a number, what percent one number is of another, and percentage change.

Monthly EMI, total interest and a yearly schedule for home, car or personal loans.

Estimate what a monthly SIP could grow to at an expected return.

Add GST to a price or take it out, with CGST and SGST split.

Body mass index from your height and weight, with the adult category.

Convert length, weight, area, volume, temperature, speed, data and time.