eCalc is a free online calculator. It has a basic calculator and scientific calculator. Basic calculator works simple. Scientific calculator is for more advanced calculations. eCalc has also unit converter for time, volume, power, length, area, mass, length, energy, temp, force and pressure units. You do not need to sign-up or register to use this free online calculator and unit converter.Check this cool website:
http://www.ecalc.com
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