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At the workbench you might flip to a datasheet, a schematic or a parts catalog, then come back to Resistor Color Code & SMD Calc. The app now spends less effort undoing and redoing its internal work around those trips, so jumping between apps weighs a little less, plus minor refinements.
Colours ↔ value for 3–6 bands, read check from both ends, E-series, SMD codes
Resistor Color Code Calc reads resistor colour bands both ways: pick the colours you see, or type a value and see the bands. It checks the reading from both ends of the part, shows which E-series the value belongs to, and reads SMD, capacitor and inductor codes too. ▶ COLOURS → VALUE, VALUE → COLOURS Choose 3, 4, 5 or 6 bands and tap each band to set its colour. Every colour chip shows its name and what it means in that position (digit, multiplier, tolerance or temperature coefficient), so you do not have to tell shades apart by eye alone. Type a value such as 4.7k, 4k7, 4,7 kΩ, 1M2 or 0R22 and the bands are drawn for you. If the value needs more digits than the chosen band count can show (4.99k on 4 bands), the app says so and offers 5 bands or the closest value with its deviation, instead of rounding silently. ▶ READ CHECK FROM BOTH ENDS Gold, silver and pink cannot be a first digit, black has no tolerance, white has no temperature coefficient. The app checks every band against these position rules from the left and from the right: • only one direction is valid: you get that reading, and Flip turns the bands to match • both directions are valid: both readings are shown side by side, because the colours alone cannot say which end is band 1 • neither direction is valid: the band that breaks the rule is named Gold and silver work as multipliers in the 4th position of 5-band resistors (10 Ω, 1 Ω), and the pink ×0.001 multiplier is supported. ▶ FULL RESULT Value, tolerance range (min – max), temperature coefficient for 6 bands, the working (47 × 10² Ω), the value in plain ohms and RKM code (4K7), and the E-series it belongs to: E3, E6, E12, E24, E48, E96 and E192. If the value is not in the series that fits its tolerance, the nearest values on each side are listed with their deviation. ▶ SMD, CAPACITOR AND INDUCTOR CODES • SMD resistors: 3-digit (472), 4-digit (1002), R notation (4R7, R047) and EIA-96 (01C, 68X) • Capacitors: 3-digit pF codes (104 = 100 nF), last digit 8 or 9 (229 = 2.2 pF), letter as decimal point (4n7, p47) and tolerance letters (J, K, M, Z; B, C and D in pF for small values) • Inductors: 3-digit µH codes (101 = 100 µH) and R/N notation (4R7, 47N) When a code fits more than one marking system, every reading is listed. ▶ BENCH TOOLS • Two values: the closest single standard values and the closest series and parallel pairs from E12, E24 or E96 for the value you need • Voltage divider: R1 and R2 pairs for the output you want • LED resistor: the exact value, the next E24 value up and the current it gives • Ohm's law: any two of voltage, current, resistance and power Power ratings are suggested with a 2× margin, marked as a rule of thumb. ▶ SAVED Tap Save to keep a reading, a code or a tool result, and reopen a saved band set later. Results saved by the previous version stay in the list. The colour code follows IEC 60062 and the series values follow IEC 60063. Printed colours vary between makers and lighting, so confirm critical parts with a multimeter. Works offline, no account. Supported by ads: an ad may appear when you open the app, a banner is shown at the bottom, and a full-screen ad may follow a successful Save. Sharing a result as text can be unlocked for 24 hours by watching an ad.