BALKE WORKBENCH / IOT & ELECTRONICS

Resistor calculator.

Read the bands. Find the value. Build your circuit.
Color codes, SMD markings, and everyday resistance calculations, right in your browser.

Color code → resistance

Read left to right, with the tolerance band toward the right. Select a band to change its color.

1. Digit2. Digit3. Multiplier4. Tolerance

BAND 1 / Digit

RESISTANCE

1 kΩ

±5% tolerance

950 Ω – 1.05 kΩ

Common notation: 1K
Standard series: E6 / E12 / E24 / E48 / E96

brown · black · red · gold

Resistance → color code

Use the band count and tolerance above. Values are converted exactly, without rounding.

SMD decoder

Standard 3-digit, 4-digit, and R markings.

SMD marking

4.7 kΩ

The marking alone does not specify tolerance or wattage.

Nearest standard value

Closest by absolute resistance; ties choose the lower value.

Target resistanceE-series

4.7 kΩ

Difference: 0 Ω (0.000%)

Series & parallel

Separate up to 50 values with commas, semicolons, or new lines.

Resistor values

Series · R₁ + R₂ + …

3.67 kΩ

Parallel · 1 / (1/R₁ + 1/R₂ + …)

279.158 Ω

Ohm’s law & power

Known quantities

Voltage (V)Resistance (Ω, k, M)

0.025 W

5 V · 0.005 A · 1 kΩ

V = IR · P = VI = I²R = V²/R

With 2× power headroom: 0.125 W nominal rating.

Assumes a steady DC load and operation at no more than 50% of nominal wattage. Check the part’s datasheet for temperature derating, voltage limits, and pulse loads. Color bands do not identify wattage.