hello guys, i have and IP address and Gateway to set on a PC at my work, but how to find out the subnet mask without those calculations methods, any software or command that it can provide me the subnet mask of that IP since my PC (2nd PC) on the same network as well, but another VLAN

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Well, you could do the binary math and figure it out, or you could search for an online subnet mask calculator which can do most or all of it for you.

Not sure if this answers your question but if you set your PC on DHCP (if there is one) and then type ipconfig in a cmd box, you can read the gateway and subnet. Then put it back on fix IP with same gateway and subnet.