Resistor Calculator

Color bands ↔ Resistance · IEC 60062 standard

Bands

Resistance

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Ohms

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Tolerance

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Min / Max—

E-series—

Typical use—

SMD code—

Sequence—

Current at common voltages (Ohm's law)

Practical Insights

Power dissipation & heat

Power level indicator (0 → 1 W)

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Circuit behaviour

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LED current limiting Vf ≈ 2V

Voltage divider R1=R2=this

Equal resistors give Vout = Vin ÷ 2.

RC time constant τ = R × C

τ = time to charge to ~63%. 5τ ≈ fully charged.

Resistor Color Calculator · IEC 60062 standard