Resistor Calculator

Decode any through-hole resistor using the IEC 60062 color code. 4-band uses two significant digits plus multiplier and tolerance. 5-band adds a third digit for precision. 6-band adds a temperature coefficient band. The 4-band formula is R = (D1 × 10 + D2) × M, and the 5-band formula is R = (D1 × 100 + D2 × 10 + D3) × M.

Decode surface-mount resistor markings. 3-digit code: first two digits are significant, third is the power-of-10 multiplier (472 = 4.7 kΩ). 4-digit code adds a third significant digit (1002 = 10 kΩ). EIA-96 uses two digits to index the E96 table and a letter for the multiplier (56B = 3.74 kΩ).

Solve series and parallel resistor networks with any number of components. Series: R_total = R1 + R2 + … + Rn. Parallel: 1/R_total = 1/R1 + 1/R2 + … + 1/Rn. The app returns equivalent resistance, total current, and voltage drops across each element.

Calculate the output voltage of a resistor divider with Vout = Vin × R2 ÷ (R1 + R2). Size a current-limiting resistor for any LED with R = (Vsupply − Vforward) ÷ Iled. The app also reports the nearest standard E-series value for practical builds.

Reference the E12, E24, E48, E96, and E192 standard value series used in resistor manufacturing. Determine the tolerance range for any decoded value — for example, a 1 kΩ resistor with ±5% gold tolerance spans 950 Ω to 1,050 Ω. Supports IEC 60062 and DIN EN 60062 markings.

Access the full resistor color code chart, SMD marking tables, and E-series reference directly in the app. Export calculation results to CSV for lab reports or project documentation. All calculations run on-device and work fully offline with no internet required.