R_series=ΣR, 1/R_parallel=Σ(1/R)Series resistances add directly; parallel conductances add.
Electrical engineering
Series & parallel resistance
Study equivalent resistance for simple resistor networks.
LocalFree
Engineering study use only
Not a design or certification tool. Do not use the result for construction, manufacturing, procurement, code compliance or any safety-critical decision. Independently verify it.
Not a design or certification tool. Do not use the result for construction, manufacturing, procurement, code compliance or any safety-critical decision. Independently verify it.
This tool runs on your device in the browser.
Instructions and limitations
TOOL GUIDE
What this tool is for
Series & parallel resistance — Study equivalent resistance for simple resistor networks.
Useful for practice, understanding the method, and checking homework steps where outside tools are allowed.
Common uses
- Practice a formula or method
- Check your working
- Review before a lesson or exam
Engineering study use only
This is a learning aid, not a professional design or certification tool. Do not use its result for construction, manufacturing, procurement, code compliance, or safety-critical decisions. Verify independently and consult a qualified professional.
EXPLANATION & EXAMPLE
Understand the result—not just the number
Use the starting values, then change one input to see its effect.After calculating, the tool shows the values used and the working so you can check it.