4-band resistor
- Input
- brown-black-red-gold
- Expected output
- 1 kΩ ±5%
Brown (1), black (0) → 10; red ×100 → 1,000 Ω.
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resistor color code calculator
Instead of doing the math by hand, select the color of each resistor band, digits, multiplier, tolerance and, on 6-band resistors, temperature coefficient, and see the computed value instantly, formatted in Ω, kΩ or MΩ.
Brown (1), black (0) → 10; red ×100 → 1,000 Ω.
Brown-black-black (100) × red (×100) = 10,000 Ω; brown = ±1% and 100 ppm/K.
Red (2), violet (7), black (0) → 270; brown ×10 → 2,700 Ω = 2.7 kΩ; green = ±0.5%, range between 2,686.5 Ω and 2,713.5 Ω.
Start from the end opposite the tolerance band. The tolerance band is usually gold or silver (or visibly set apart from the rest with a wider gap), so it's always read last, and tells you which end to begin at.
Yes. Pick the band count and the tool automatically adjusts how many digit bands to use (2 on 4-band resistors, 3 on 5- and 6-band resistors) and whether to show the temperature-coefficient band (only on 6-band).
The colors follow the international IEC 60062 standard, so black always means digit/power 0, brown always means 1, and so on up to white (9), following the rainbow sequence. Gold and silver sit outside that digit count because, under the standard, they only work as a fractional multiplier (×0.1 and ×0.01) and as a tolerance band.
Yes. Besides the nominal value, it computes the minimum and maximum acceptable value from the selected tolerance percentage.
No, gold and silver only appear in the multiplier and tolerance pickers, because they don't represent any significant digit in the color code.
Lookup and calculation happen locally in your browser; no color or value is ever sent to a server.