The math is plain: total value = tokens received × current unit price, and net value = total value − your costs. Both are worked out on the spot from the price you typed in — no live feed, and nothing you enter gets uploaded.
One reminder: what you hold is tokens, not cash. What it's finally worth depends on whether you can sell, and at what price — thin order books, withdrawal delays, or a dump the moment it opens can all mean you never get the price you typed in. New tokens dropping below launch price is common, so learn the costs and risks of each of the four types before you jump in — see which of the four to pick. This is only a static estimate, not investment advice.