Resistor Calculator

Connection Type

Resistor Values (Ohms)

Accepts units: R, k/K, M, G (e.g., 4R7, 2.2k, 1M). Separate with commas, spaces, or new lines.

Drag & drop a CSV/text file here, or choose a file.

Client-side only. Contents stay in your browser.

Resistor Calculator – Quick Cheat Sheet

Series: R_eq = R₁ + R₂ + … + Rn
Parallel: 1/R_eq = 1/R₁ + 1/R₂ + … + 1/Rn (or R_eq = 1 / Σ(1/Ri))
Units: R=Ω (e.g., 4R7 = 4.7 Ω), k=10³, M=10⁶, G=10⁹.
Input tips: Enter values separated by commas, spaces, or newlines. Mixed units OK (e.g., 100, 2.2k, 1M).
Validation: Ignores blanks; rejects non-positive or invalid values. Parallel sets cannot include zero or negative values.
Edge cases: Any invalid number is skipped with an error; if none remain, no result is shown. Parallel of very large/small magnitudes may need high precision.

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