Resistor Code
Calculator
Decode resistor color bands, SMD codes, and calculate Ohm's Law — the complete electronics companion for makers, students, and engineers.
Decode resistor color bands, SMD codes, and calculate Ohm's Law — the complete electronics companion for makers, students, and engineers.
Dark and light mode. Clean, fast, and offline.
Built for the workbench, the classroom, and the field.
Full support for 4-band, 5-band, and 6-band resistors. Tap any band to change its color and see the value update instantly.
Got a value? Enter it in Ω, kΩ, or MΩ and instantly see the corresponding color bands with your preferred tolerance.
Decode 3-digit, 4-digit, R-notation (like 4R7), and precision EIA-96 SMD resistor codes in one tap.
Calculate voltage, current, resistance, or power from any two known values. Every combination supported.
Save frequently-used resistor values to your favorites. Recent calculations are kept in your history.
Visual indicator shows when a value belongs to the standard E6, E12, or E24 series — handy when checking BOM accuracy.
Auto-adapts to your system theme. Easy on the eyes whether you're soldering at midnight or debugging in daylight.
No internet, no accounts, no cloud. Everything works on your device — even in the deepest workshop basement.
Localized for English, Turkish, German, Spanish, French, Italian, Russian, Portuguese, Japanese, and Chinese.
From standard 3-digit codes to precision EIA-96 — decoded instantly.
No compromise on privacy. Ever.
Completely ad-free
Zero data collection
Works fully offline
Data stays on device
Built for makers and students everywhere.
Free forever. No ads. No subscriptions. No tracking.
