Parallel Resistor Calculator R1 + R2 total resistor finder resistance - sengpielaudio
 
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● Parallel  Resistance  Calculator ●

Parallel Resistor Finder
 
Parallel Resistors
 
Please enter two resistor values, the third value will be calculated.
You can even enter the total resistance Rtotal and one known resistance R1 or R2.
 
Resistor R1: 
Resistor R2: 
Parallel Resistance Rtotal: 
 

Equation for the calculation of the resistances R1 and R2 connectet in parallel:

Parallel01

Parallel02

Calculation of the necessary parallel resistor R2, when R1 and the total resistance Rtotal is given:

Formula resistor parallel

The first step is to clear all fractions by multiplying by the lowest
common denominator, that is Rt × R1 × R2 ... so we get:
1/Rt = 1/R1 + 1/R2
Rt × R1 × R2[1/Rt = 1/R1 + 1/R2]
R1 × R2 = Rt × R2 + Rt × R1 then collect terms with R1 and solve
R1 × R2 − Rt × R1 = Rt × R2
R1(R2 − Rt) = R2 × Rt
and finally:
R1 = R2 × Rt / (R2 − Rt)

Notice: This calculator can also solve other math problems. Calculating resistors in parallel is
precisely the same as the calculations required for inductors in parallel or for capacitors in series.

Microphone sensitivity conversion

• Search resistances R1 and R2, when the target resistance (equivalent resistance) is known •

Calculation: Resistor pairs - reverse engineered calculator
Search of R1 and R2 with known target resistance

Microphone sensitivity conversion

● Many resistors in parallel ●

This calculator determines the resistance of up to 10 resistors in parallel.
Enter resistances into the boxes below and when all values have been input,
click on the 'calculate' button and the result will appear in the box below that button.
As a test, if you enter resistances of 4, 6, and 12 ohms, the answer should be 2 ohms.
Notice: Manually clearing the boxes does not reset stored values. Use "reset".









 
Significant figures:

Ohm's law - calculator and formulas

Two resistors in parallel and the resulting total resistance
Resistance ranging from 1 ohm to 100 ohms

R2 R1
1 1.5 2.2 3.3 4.7 6.8 10 15 22 33 47 68
1 0.5 0.6 0.69 0.77 0.83 0.87 0.91 0.93 0.95 0.97 0.98 0.99
1.5 0.6 0.75 0.89 1.03 1.14 1.22 1.30 1.36 1.40 1.43 1.45 1.46
2.2 0.69 0.89 1.1 1.32 1.50 1.66 1.82 1.92 2.0 2.06 2.10 2.13
3.3 0.77 1.03 1.32 1.65 1.94 2.22 2.48 2.70 2.87 3.00 3.08 3.14
4.7 0.83 1.14 1.50 1.94 2.35 2.78 3.20 3.58 3.87 4.12 4.27 4.39
6.8 0.87 1.22 1.66 2.22 2.78 3.40 4.05 4.68 5.19 5.64 5.94 6.18
10 0.91 1.30 1.82 2.48 3.20 4.05 5.0 6.0 6.9 7.7 8.3 8.7
15 0.93 1.36 1.92 2.70 3.58 4.68 6.0 7.50 8.9 10.3 11.4 12.2
22 0.95 1.40 2.00 2.87 3.87 5.19 6.9 8.9 11.0 13.2 15.0 16.6
33 0.97 1.43 2.06 3.0 4.12 5.64 7.7 10.3 13.2 16.5 19.4 22.2
47 0.98 1.45 2.1 3.08 4.27 5.94 8.3 11.4 15,0 19.4 23.5 27.8
68 0.99 1.46 2.13 3.14 4.39 6.18 8.7 12.2 16.6 22.2 27.8 34.0
 
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