What you provide
What you provide
- First resistance expressed in ohm, using the same scenario as the other inputs
- Second resistance expressed in ohm, using the same scenario as the other inputs
PHYSICS / ELECTRICAL CIRCUITS
Series and Parallel Resistor Calculator
Calculate equivalent resistance for two ideal resistors connected wholly in series or wholly in parallel. Inspect the SI equation, substituted inputs, derived result, and physical limitations in one guided workspace.
- 01 Calculated in this tab
- 02 Values stay in this browser tab
- 03 Use boundary
Use boundary
Calculation path
Calculate equivalent resistance for two ideal resistors connected wholly in series or wholly in parallel. The page evaluates the displayed equation from your supplied values and presents both symbolic and substituted KaTeX working so the arithmetic can be checked.
Calculation path
R_parallel=R_1R_2/(R_1+R_2)
What you receive
What you receive
- Parallel equivalent resistance in ohm from the stated equation
- A symbolic formula plus substituted working with your values
- Visible assumptions, field guidance, and an authoritative learning reference
Use boundary
Choose the maximum decimal places shown. This does not increase source accuracy.
This is an idealized educational model; verify material properties, losses, tolerances, boundary conditions, and safety factors before engineering use.
Use internally consistent units and retain extra precision when carrying the result into another calculation.
Reviewed reference factors