Ohm’s Law Calculator
Engineering
Compute voltage, current, resistance and power from any two values.
V = I × R
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Solve as you type
3 calculators
Engineering
Molar mass from a chemical formula, solution molarity, and Ohm's law for circuits. Enter what you know and the unknowns solve themselves as you type.
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Engineering
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Enter the known values and solve for the rest. Units and formulas are spelled out on every page.
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Why use these calculators
Solve for any variable
Ohm's law and molarity tools let you enter what you know and compute the rest, with units handled for you.
Chemistry-grade inputs
The molar mass tool parses real chemical formulas using standard atomic weights, element by element.
Every equation in the open
Formulas, variables, and units are written out on each page, ready to cite in your lab notebook.
Frequently asked questions
Add up the standard atomic weight of every atom in the formula. Enter a formula like H2SO4 and the calculator parses each element, multiplies by its count, and totals the grams per mole.