About Us

calcsolveronline.com is a free scientific calculator made for one job: show you the whole sum you typed, give the answer before you press equals, and keep your last calculations a tap away.

What the site does

The calculator covers arithmetic, trigonometry, inverse trig, logarithms, roots, powers, factorials and percentages, in degrees or radians. It works with the on-screen keys or a keyboard and runs entirely in your browser.

Code Mode adds a second use. Switch it on, type a 4-digit code, and an activity from our library opens. 0000 opens the whole library. Every activity keeps its code for good, and the full list is on our Codes page.

How we check the answers

The calculator uses its own maths engine instead of passing your sum to a generic “evaluate” function. That lets us control the order of operations, minus signs, percentages and angle units, and show a clear Error for cases like tan 90° or the square root of a negative number.

Every worked example on the site is typed into the calculator and checked before it’s published. When the calculator changes, we test those examples again.

Where the activities come from

Library activities come from a third-party provider of free browser activities and load inside a frame on our page. We don’t make them. The list refreshes daily, and we remove any activity that doesn’t belong.

How the site stays free

There’s no account, subscription or paid tier. We may show ads in future to cover hosting; our Privacy Policy will say so before that starts.

Get in touch

Wrong answer, broken code or an activity that won’t load? Email support@calcsolveronline.com with what you typed or the code you used.