Science & Engineering tools
Science and engineering calculators for students and professionals, electronics, physics, chemistry, mechanics, and advanced math, with the formulas shown. Each runs in your browser, so results stay private and immediate.
Popular Science & Engineering tools
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Ohm's Law Calculator
Solve any of voltage, current, resistance, or power from the two you know, using Ohm’s law and the power equation. Calculates in your browser.
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Resistor Color Code Calculator
Decode 4-, 5-, and 6-band resistor color codes into resistance, tolerance, and temperature coefficient — or read the bands for a value. Calculates in your browser.
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Series & Parallel Resistance Calculator
Find the total resistance of resistors wired in series or in parallel, with the equivalent value updated as you add components. Calculates in your browser.
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Voltage Divider Calculator
Calculate the output voltage of a two-resistor voltage divider, or size the resistors to hit a target output. Calculates in your browser.
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LED Resistor Calculator
Work out the series resistor an LED needs from supply voltage, forward voltage, and forward current — plus the power the resistor dissipates. Calculates in your browser.
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RC Time Constant Calculator
Find the RC time constant from resistance and capacitance, plus the charge/discharge level at any time and the time to reach a target. Calculates in your browser.