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Engineering Tools
Free online engineering calculators — no signup required.
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Ohm's Law Calculator
Calculate Voltage, Current, Resistance or Power from any two known values
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Resistor Color Code
Decode 4-band resistor color codes to resistance and tolerance
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Aspect Ratio Calculator
Simplify pixel dimensions to a ratio or calculate a missing dimension
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PPI Calculator
Calculate pixels per inch, megapixels and dot pitch for any screen