Is there a calculator with LaTeX-syntax?

Question

When I write math in LaTeX I often need to perform simple arithmetic on numbers in my LaTeX source, like 515.1544 + 454 = ???.

I usually copy-paste the

Answer 1

My calculator can do that. To get the formatted output, double-click the result formula and press ctrl+c to copy it.

It can do fairly advanced stuff too (differentiation, easy integrals (and not that easy ones)...).

https://calculator-algebra.org/cgi-bin/calculator?request=calculator&mainInput=%5cfrac%7b1%2b2%7d%7b3%7d%3b%0ad%2fdx%28arctan%20%282x%2b3%29%29