Achievable MCS rates for various SNR

If you ever had the doubt, why my WiFi speed is slow even while i stand next to the Access point or with having good coverage. Just having a strong wireless coverage/ signal  alone will not help you to achieve the highest possible  speed on wireless. We need to consider the floor noise too. The following chart has MCS values for  SNR(signal to noise ratio)

This can come handy when calculating the throughput on wireless Networks:

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