Engineering Suite
Electronics Calculators & Circuit Solvers
High-precision mathematical tools for laboratory testing, component sizing, and PCB routing.
Ohm's Law
Resistor Color Matrix
LED Resistor Sizing
Voltage Divider
RC Filter
555 Timer
PCB Trace (IPC-2221)
Battery Run-Time
Decibels
Capacitor Codes
Ohm's Law & DC Power
V = I × R • P = V × I
Enter any two parameters to compute the remaining values.
Enter any 2 parameters to calculate...
Resistor Color Decoder
4-Band Standard
Select the color bands for visual decoding and tolerance bounds.
220.0 Ω ±5%
LED Current Limiter
R = (Vs - Vf) / If
Computes required resistance and minimum wattage with E12 nearest value.
Recommended Standard (E12): 220 Ω
Voltage Divider & Ratio
Vout = Vin × R2/(R1+R2)
Calculates unloaded output voltage, dB attenuation, and current.
Vout = 2.500 V (Ratio: 50.0%)
RC Cutoff Frequency
fc = 1 / (2πRC)
Calculates -3dB cutoff frequency and time constant for analog filtering.
Cutoff Frequency (fc): 1.59 kHz
NE555 Astable Oscillator
f = 1.44 / ((R1+2R2)C)
Solves output oscillation frequency, period, and duty cycle.
Frequency: 6.86 Hz • Duty Cycle: 52.4%
PCB Trace Width (IPC-2221)
Standard 1 oz Copper
Computes minimum copper trace width for target current and temp rise.
Recommended Width: 0.75 mm (29.5 mils)
Battery Run-Time Estimator
Derated at 85%
Calculates run-time hours based on battery mAh rating and circuit draw.
Estimated Longevity: 23.4 Hours (~0.98 Days)
Decibel (dB) Voltage Ratio
dB = 20 × log10(V2/V1)
Converts linear voltage gain or loss to decibels.
+20.00 dB (Gain: 10.000x)
Ceramic Capacitor 3-Digit Code
EIA Standard
Decodes 3-digit printed markings into pF, nF, and µF values.
100.00 nF (0.1000 µF • 100,000 pF)