What is the equation for calculating static thrust?
By now you should have found this answer on static thrust. It explains how to arrive at this equation for static thrust $T_0$:
 $$T_0 = \sqrt[3]{P^2\cdot\eta_{Prop}^2\cdot\eta_{el}^2\cdot\pi\cdot \frac{d_P^2}{2}\cdot\rho}$$
Your P is at most 11.1 V × 4.5 A = 49.95&nbsp;W. Your prop efficiency $\eta_{Prop}$ must be guessed; let's take 60%. The electric efficiency should be higher; let's use 95% for now. The prop diameter $d_P$ is 3 or 5&nbsp;inches (depends if your comments or the picture in your question is more reliable), so I use 0.127&nbsp;m for now. Air density is given with 1.18&nbsp;kg/m³.

When I plug in the numbers, I get 2.894&nbsp;N. One propeller can lift approximately 295&nbsp;g of quadcopter, and all four will produce thrust equivalent to the weight of 1.18&nbsp;kg in Earth's gravitation. Looks about right for a quadcopter of 500&nbsp;g.

Don't assume that the motor delivers all the power the propeller can absorb. Also, don't assume that the RPM of the isolated motor can be maintained when it is driving a propeller.