One tool that every engineer needs is a scientific calculator. One tool that almost every student needs is a calculator. Calculators have a come a long way and Casio has done fantastic job of churning out more powerful calculators year on year.

With the advent of the computer and the internet calculators have gone online. The default one that comes with Windows is extremely useful for daily use. However, if you’re looking for something more powerful, then you should check out eCalc.

eCalc is a free online calculator that supports many advanced features including unit conversion, equation solving, and even complex-number math.  The calculator is designed to work directly in your browser and requires no special plug-ins.



  • Trigonometry
  • Algebra
  • Scientific Math
  • Equation Solver
  • Complex Numbers
  • Unit Converter
  • Decimal to Fraction
  • RPN or Algebraic

However, eCalc is available as an offline version as well. The basic version is free. However, the Scientific desktop version is available for $15. If you start using this regularly and like it then the $15 is actually worth the purchase.

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Download other versions of eCalc

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