# Simulation measured voltage not matching calculations

Ok, so I have the following circuit:

The source voltage is 5V.

The voltage measured between A and B is 2.44V, which differs from what I get by calculating that same voltage - 2.55. Here is how I am calculating it.

R1=1000

R2=1/(1/1.2*1000+1/4.7*1000) //adding voltages of parallel resistors using the 1/Rt = 1/R1+1/R2 formula

Rtotal=R1+R2

Vab=R1/Rtotal*5V

Vab=2.55 //calculated result using MS Mathematics because I am a lazy piece of shit

As you can see there is a difference of 0.11V. Is that normal or is there another reason as to why it happens? Am I doing something wrong? Is the simulator bugged, maybe?

UPDATE: Here is how I get the exact same value using excel:

Gonna pick up a pen and paper and see what I get myself.

• my calcs are 2.44367V what exactly did you do – JonRB Sep 16 '15 at 21:44
• @JonRB, see updated question – Phoenix Sep 16 '15 at 22:03
• What did you get for R2? I get 955.96 Ohms, resulting in 2.4437 volts. You should show your intermediate results to aid in troubleshhoting. – Peter Bennett Sep 16 '15 at 22:05
• @PeterBennett, I just updated the question with more details :) – Phoenix Sep 16 '15 at 22:06
• The formula in line 10 is wrong. It formula should be =(B7/B8) * B9. Line 8 is the result of B1+B7, not B1 + B6 as the table shows. – Peter Bennett Sep 16 '15 at 22:11