Electronics Calculators
All interactive calculators from across TechArya lessons, collected in one place.
Each calculator links back to the lesson where the concept is taught — so you can read the theory, come back here to calculate, or go deeper when you need context.
Ohm's Law
FundamentalsCalculate Voltage, Current, or Resistance. Enter any two values and leave one blank to solve for it.
V = I × R
Series / Parallel Resistors
FundamentalsCalculate total resistance for up to 5 resistors in series or parallel.
Series: RT = R1 + R2 + … | Parallel: 1/RT = 1/R1 + 1/R2 + …
Voltage Divider
FundamentalsFind output voltage or resistor values for a two-resistor voltage divider. Leave one field blank to calculate it.
Vout = Vin × R2 / (R1 + R2)
Current Divider
FundamentalsCalculate how total current splits between two parallel resistors. Leave one field blank to calculate it.
I1 = Itotal × R2 / (R1 + R2)
Power Calculator
FundamentalsSolve for Power, Voltage, Current, or Resistance. Enter any two known values and leave the others blank.
P = V × I | P = I² × R | P = V² / R
KCL — Kirchhoff's Current Law
FundamentalsVerify or calculate currents at a node. Use positive values for currents entering, negative for leaving. Leave one blank to solve for it.
ΣIin = ΣIout
KVL — Kirchhoff's Voltage Law
FundamentalsVerify voltages around a loop. Positive = voltage rise (source), negative = voltage drop (resistor). Leave one blank to solve for it.
ΣV = 0 around any closed loop
RC Time Constant
FundamentalsCalculate RC time constant τ, or find R or C given the other two. One full time constant = 63.2% charge.
τ = R × C
Reactance Calculator
AC FundamentalsCalculate capacitive or inductive reactance at a given frequency. Leave reactance blank to calculate it, or enter it to find C or L.
Xc = 1 / (2πfC) | XL = 2πfL
Impedance Calculator
AC FundamentalsCombine resistance and reactance into total impedance. Positive reactance = inductive, negative = capacitive.
Z = √(R² + X²)
AC Power Calculator
AC FundamentalsCalculate Real (P), Reactive (Q), Apparent (S) power and Power Factor from voltage, current, and phase angle.
P = V·I·cos(θ) | S = V·I | Q = V·I·sin(θ)
Filter Cutoff Frequency
Analog ElectronicsCalculate the -3dB cutoff frequency for an RC low-pass or high-pass filter. Leave one field blank to solve for it.
fc = 1 / (2π × R × C)
555 Timer — Monostable
Analog ElectronicsCalculate the one-shot pulse width for a 555 timer in monostable mode. Leave one field blank to solve for it.
T = 1.1 × R × C
555 Timer — Astable (Oscillator)
Analog ElectronicsCalculate frequency, duty cycle, and period for a 555 astable oscillator. Leave frequency blank to calculate from R1, R2, C.
f = 1.44 / ((R1 + 2×R2) × C)
MOSFET Conduction Power Loss
SemiconductorsCalculate power dissipated in a MOSFET during conduction. Essential for thermal design and heatsink selection.
P = I² × RDS(on)
[!TIP] Tip: Each calculator uses the same formula and API as the one embedded in its lesson. You can use this page as a quick-access workbench while studying, then follow the lesson link when you need to understand the theory behind a result.