Science
Resistor colour codes, Ohm's law, molar mass and an interactive periodic table. Small, exact tools for electronics work and chemistry homework.
Resistor Color CodeDecode 4, 5 and 6-band resistor color codes into resistance and tolerance — essential for electronics projects.Ohm's Law CalculatorEnter any two of voltage, current, resistance or power to instantly get the rest, with the formulas used.Molar Mass CalculatorEnter a chemical formula like Ca(OH)2 to compute its molar mass with a per-element breakdown — in your browser.Periodic TableExplore all 118 elements in an interactive periodic table — tap any element for its symbol, number and atomic mass.