The filter thread size of Nikon AF-S DX Nikkor 18-300mm F3.5-5.6G ED VR is 77mm.
Below are links to the filters that we recommend you to consider for your Nikon 18-300mm F3.5-5.6G ED VR:
Read our detailed Nikon AF-S DX Nikkor 18-300mm F3.5-5.6G ED VR Review