OhmKit - Resistor Calculator

OhmKit is a resistor calculator and electronics toolkit for engineers, technicians, students, makers, and hobbyists. Decode resistor color codes and SMD resistor markings, calculate Ohm's law and LED resistor values, design common circuits, and organize project BOMs in one clean app.

CALCULATORS
• Resistor color code decoder for 3, 4, 5, and 6 bands
• Resistance value to color bands
• SMD resistor code decoder and encoder
• Series and parallel resistor calculations
• Target resistance suggestions using standard E-series values
• Ohm's law calculations for voltage, current, resistance, and power
• LED resistor calculator for series and parallel LED circuits
• Voltage divider calculator
• Resistor power and recommended power-rating calculations
• Automatic engineering-unit conversion

WORKFLOW TOOLS
• Save calculation history and favorites
• Create reusable presets
• Organize components in projects and bills of materials (BOM)
• Export project data to PDF or CSV
• Back up and restore supported local app data
• Share and copy calculation results
• Built-in electronics references

DESIGNED FOR EVERYDAY USE
• Clear circuit diagrams and standard electrical symbols
• Light and dark themes
• Adjustable calculator and display preferences
• Interface available in 13 languages
• Core calculations run locally on your device

The free version contains ads. OhmKit Pro removes ads and unlocks additional workflow features. Purchases are processed securely by Google Play.

Calculation results are provided as engineering aids. Always verify component ratings and manufacturer specifications before building or powering a circuit.