Electronics Calculators

Electronics is unfortunately related to lots of math. Included here are several electronics calculators to help take the load off your brain. Just plug in your numbers, hit "Calculate" and the page does the rest. Note that I am by no means a math whiz, and therefore have included only the most basic formulas. If you have a formula that you believe is important, then just Mail Me and I will add it to this page. If for some reason you get an answer that is "NaN", "Infinity", or other such message it means that the script cannont handle the numbers you put it.

Resistors

Series Resistors (R1+R2=Rt):

Calculates up to four resistors in series. All values in Ohms.

R1:	R2:	R3:	R4:
Calculated Rt:

Two Parallel Resistors ( Rt=(R1 x R2)/(R1 + R2) ):

Calculates up to two resistors in parallel. All values in Ohms.

R1:	R2:
Calculated Rt:

Three Parallel Resistors (Rt=1/(1/R1)+(1/R2)+(1/R3):

Calculates up to three resistors in parallel. All values in Ohms.

R1:	R2:	R3:
Calculated Rt:

Capacitors

Parallel Capacitors (C1+C2=Ct):

Calculates up to four capacitors in parallel. All values in uF.

C1:	C2:	C3:	C4:
Calculated Ct:

Two Series Capacitors ( Ct=(C1 x C2)/(C1 + C2) ):

Calculates two series capacitors. All values in uF.

C1:	C2:
Calculated Ct:

Three Series Capacitors (Ct=1/(1/C1)+(1/C2)+(1/C3):

Calculates up to three capacitors in series. All values in uF.

C1:	C2:	C3:
Calculated Ct:

Ohm's Law

Ohm's Law (V=IR):

Calculates a voltage (V) from a current(I) and a resistance(R). Resistance is in Ohms. Current is in Amps. Voltage is in Volts.

I:	R:
Calculated V:

Ohm's Law (I=V/R):

Calculates a current(I) from a voltage(V) and a resistance(R). Resistance is in Ohms. Current is in Amps. Voltage is in Volts.

V:	R:
Calculated I:

Ohm's Law (R=V/I):

Calculates a resistance(R) from a voltage(V) and a current(I). Resistance is in Ohms. Current is in Amps. Voltage is in Volts.

V:	I:
Calculated R:

Ohm's Law (P=VI):

Calculates a power(W) from a voltage(V) and a current(I). Power is in Watts. Current is in Amps. Voltage is in Volts.

V:	I:
Calculated P:

LEDs

LED Series Resistor Value ( R=(VSupply-VLED)/LEDCurrent) ):

Calculates the correct value for the dropping resistor(R) used in series with an LED. VSupply is the supply voltage in volts. VLED is the LEDs operating voltage in volts. LEDCurrent is the current required by the LED in Amps.

Supply Voltage:	LED Voltage:	LED Current:
Calculated R:  Ohms