Based on a recessional velocity of 22365 km/sec, a straightforward calculation suggests that NGC 3950 is about 1.04 billion light years away. However, for objects at such a distance, we need to take the Universal expansion into account. Doing that shows that the galaxy was about 955 million light years away when the light by which we see it left the galaxy, about 990 million years ago (the difference between the two numbers being due to the expansion of the intervening space in that interval). Given that and its apparent size of 0.40 by 0.35 arcmin, the galaxy is about 110 thousand light years across.