Science & Engineering
Ohm's Law, Molar Mass, Dilution, Decibel and more
Ohm's Law Calculator
Enter any two of voltage, current and resistance to get the third value plus power. Free Ohm’s Law calculator (V=IR) for electronics.
Molar Mass Calculator
Enter a chemical formula to calculate its molar mass, elemental composition and mass percentages. Free online molar mass calculator.
Dilution Calculator
Use the C1V1=C2V2 formula to find volume, final concentration and water to add. Free dilution calculator for molarity, serial dilution and stock prep.
Decibel Calculator
Easily calculate and convert decibel (dB) values. Compare noise levels and convert power or voltage ratios to dB with this free online decibel calculator.
Parallel Resistance
Calculate the total resistance of 2 to 10 resistors wired in parallel. Free online parallel resistance calculator for circuit design.
LED Resistor Calculator
Enter supply voltage, LED forward voltage and current to find the right resistor value. Free series resistor calculator for LED circuits.
Wavelength-Frequency Converter
Convert between wavelength and frequency instantly and get photon energy for light, sound and radio waves. Free wavelength-frequency converter.
pH Calculator
Convert between hydrogen ion concentration, pH, and pOH values. Accurately calculate the pH of acid and base solutions with this free online pH calculator.