Science & Engineering

Ohm's Law, Molar Mass, Dilution, Decibel and more

Ohm's Law Calculator

Enter any two of voltage, current, and resistance to instantly calculate the third. A free online Ohm's Law calculator based on V=IR.

Molar Mass Calculator

Enter a chemical formula to instantly calculate its molar mass. View elemental composition and mass percentages with this free online molar mass calculator.

Dilution Calculator

Accurately calculate solution dilution concentrations using the C1V1=C2V2 formula. Instantly determine required volumes and final concentrations with this free online dilution calculator.

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

Instantly calculate the total resistance of resistors connected in parallel. Enter 2 to 10 resistor values with this free online parallel resistance calculator.

LED Resistor Calculator

Calculate the correct resistor value for your LED circuit. Enter supply voltage, LED forward voltage, and current to find the ideal resistor with this free online calculator.

Wavelength-Frequency Converter

Convert between wavelength and frequency instantly. Calculate wavelength, frequency, and energy for light, sound, and radio waves with this free online 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.