Thank you for your question! If the implant you consider is a saline implant, then using the density of the 0.9% saline used to fill the implant and using the weight of the implant shell of 12 grams, we can do a simple calculation. (295 cc x 1.005 grams/cc) + 12 grams = 308.475 grams When we multiply this by 2, we get 616.95 grams. In pounds, this converts into 1.36 lbs. Similar calculation for silicone implants using the density of 0.98 grams/cc follows: (295 cc x 0.98 grams/cc) x 2 = 578.2 gramsNote that we did not include implant shell as this is approximated with silicone density. When this is converted into pounds, the weight converts to 1.27 lbs So a silicone implant weighs a bit less, but the difference is negligible. So you will just have an extra pound. Best of luck!