All 4 Calculator Tools
- Band modes: 4-band, 5-band, 6-band toggle buttons
- IEC 60062 standard color-to-value lookup
- Color grid with visual swatches — tap to assign each band
- Real-time resistance value update as you pick colors
- Tolerance band (gold/silver/brown etc.) supported
- Temperature coefficient band for 6-band mode
- Input: Supply voltage (Vs), Forward voltage (Vf), Desired current (If)
- Output: Exact resistor value in Ohms
- E12/E24 preferred value suggestion — picks nearest standard resistor
- Series and parallel LED configurations supported
- Pulse animation preview of LED state
- Enter 3-digit code (e.g., 104, 472, 225)
- Decode to pF, nF, and µF simultaneously
- Code type selector for different format conventions
- Tolerance code lookup (J=5%, K=10%, M=20%)
- Visual capacitor symbol with decoded value
- Expandable formula cards — click to expand/collapse
- Ohm's Law: V=IR, P=IV, P=I²R, P=V²/R
- Series and parallel R/C/L formulas
- Voltage divider formula
- RC time constant (τ = RC)
- Common component quick-lookup tables
IEC 60062 Color Code
Standard resistor color code values used by the calculator.
Lesser-Known Tricks
The LED calculator doesn't just give you the exact resistance — it also suggests the nearest E12 or E24 series standard resistor. Real resistors only come in standard values, so this saves you the lookup step.
Since all calculations happen in JavaScript with no network calls, all 4 tools work completely offline once cached by the Service Worker. Take your phone to the lab — calculators still work without WiFi.
The Quick Reference cards use CSS transition accordion — click any formula card and it smoothly expands to show the full derivation and example. No page reload, no JS framework needed.
Code Reference
Other Feature Guides
More deep-dives into A3KM Studio features — shortcuts, hidden tricks, mobile vs desktop comparisons and code references.