Resistor Calculator-Color Code

From reading resistor color bands to finding combinations using the resistors you own, Resistor Calculator brings practical tools together for electronics learning, circuit building, hobby projects, and repair work.
■ Resistor Color Code Calculator
• Read 4-, 5-, and 6-band resistors.
• View resistance, tolerance, and the resistance range.
• Enter a resistance value to find its color bands.
• Use the color code reference to check digits, multipliers, and tolerances.
■ Quick Calculation Tools
• SMD codes: Decode 3-digit and 4-digit codes, R/K/M notation, and EIA-96 markings.
• Series and parallel: Calculate the equivalent resistance of multiple resistors.
• LED resistors: Calculate a series resistor using supply voltage, LED forward voltage, target current, and LED count. Check an E12 standard value and power dissipation.
• Ohm’s law: Enter two values from voltage, current, resistance, and power to calculate the others.
■ Resistor Inventory
• Save resistance values, quantities, and storage locations.
• Search by resistance or location and update quantities.
• Keep separate entries for the same resistance stored in different places.
■ Find Resistor Combinations
• Set a target resistance and allowed tolerance.
• Explore series, parallel, and mixed connections using up to three resistors.
• Use inventory mode to respect the quantities you actually own.
• Turn off inventory limits to explore combinations using E12 standard values and your registered resistance values.
• Compare results by error and component count.
■ Connection Guides and History
• View connection diagrams, required quantities, and storage locations.
• Save a result to history or confirm a stock deduction when you use the parts.
• Deduct stock later or undo a previous deduction from a saved combination record.
• Reopen saved color band calculations and resistor combinations.
■ Flexible Layout
• Available in English and Korean.
• Supports portrait and landscape layouts.
LED recommendations are calculated from your inputs. Check component specifications and ratings before using them in a real circuit.

Recent changes:
• Color band calculator: 4, 5 and 6 bands, with tolerance range and reverse lookup (value to bands)
• Quick tools: SMD code, series/parallel, LED resistor and Ohm's law
• My Resistors: save values, quantities and storage spots, and search them
• Find Combos: reach a target value with the parts you own (series, parallel, mixed)
• Wiring guide with a circuit diagram, plus optional stock deduction
• History of your calculations and combos
• English and Korean