Electronics Engineering Tools & Calculators

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Electronic Engineering Tools & Calculators

Ohm's Law Calculator

Calculate voltage, current, or resistance.

Voltage (V): Current (I): Resistance (R):

V = I × R

Resistor Color Code

Decode resistor values from bands.

Band 1 (1st digit): Black (0) Brown (1) Red (2) Orange (3) Yellow (4) Green (5) Blue (6) Violet (7) Gray (8) White (9) Band 2 (2nd digit): Black (0) Brown (1) Red (2) Orange (3) Yellow (4) Green (5) Blue (6) Violet (7) Gray (8) White (9) Multiplier: Black (1Ω) Brown (10Ω) Red (100Ω) Orange (1kΩ) Yellow (10kΩ) Green (100kΩ) Blue (1MΩ) Gold (0.1Ω) Silver (0.01Ω)

LED Resistor Calculator

Calculate current-limiting resistor.

Source Voltage (V): LED Voltage Drop (V): LED Current (mA):

R = (V_source - V_LED) / I

Capacitance Calculator

Calculate series/parallel capacitance.

Capacitor 1 (μF): Capacitor 2 (μF): Connection: Series Parallel

Series: 1/C_total = 1/C₁ + 1/C₂
Parallel: C_total = C₁ + C₂

Inductive Reactance

Calculate XL from frequency.

Inductance (H): Frequency (Hz):

X_L = 2πfL

Voltage Divider

Calculate output voltage.

Input Voltage (V): R1 (Ω): R2 (Ω):

V_out = V_in × (R₂ / (R₁ + R₂))

Power Calculator

Calculate power from V/I/R.

Voltage (V): Current (A): Resistance (Ω):

P = V×I = V²/R = I²×R

Battery Life Calculator

Estimate battery runtime.

Battery Capacity (mAh): Load Current (mA):

Hours = Capacity / Current

dBm to Watts

Convert between dBm and watts.

dBm Value:

P(W) = 10^(P(dBm)/10) / 1000

RC Time Constant

Calculate charge/discharge time.

Resistance (Ω): Capacitance (F):

τ = R × C

PCB Trace Width

Calculate minimum trace width.

Current (A): Copper Weight (oz): 1 oz 2 oz Temp Rise (°C):

Transformer Turns Ratio

Calculate voltage transformation.

Primary Turns: Secondary Turns: Primary Voltage (V):

V_p/V_s = N_p/N_s

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