As a beginner I tried to make a simple DC circuit with an opamp on a single supply. This is what I came up with:

![schematic](https://i.stack.imgur.com/mk5sc.png)

[simulate this circuit](/plugins/schematics?image=http%3a%2f%2fi.stack.imgur.com%2fmk5sc.png) – Schematic created using [CircuitLab](https://www.circuitlab.com/)

I use R3 and R4 as a voltage divider to get 1V between the inputs of the opamp, and R1 and R2 in the noninverting configuration. I tested this circuit in a few simulators and they show 3V at the output.

$$ Gain = 1 + \frac{R2}{R1}=1+\frac{560}{270}\approx3 $$

[![Picture of circuit](https://i.stack.imgur.com/Afwx2.jpg)](https://i.stack.imgur.com/Afwx2.jpg)

I built the circuit and measure 5.64V where I expected 3V. What am i doing wrong?