If I put everything into the Archery program right I came up with 255fps. which is probably pretty close. Don't let published IBO speeds get your hopes up too high if you don't shoot a setup very close to those specs and with a bare string. My bow is IBO rated at 318fps. At 29" draw, 60#, 390 gr. arrow I get 260fps. and am happy with it. Don't worry about the speed just shoot it good and be happy.