I have 2 ways to guess fairly close to the actual length of a trout
One is the tip to tip index to thumb for me is 8 inches.
The other is the general width of a person's knuckles across their hands.
They vary from 3.5 inches to a huge 5 inches. This is not scientific at all.
But is good way to "guess" Better than laying the fish on the ground and measuring.
My bud John always measured his fish with his net. It has a bag in it with inches actually
on the net bottom.
GUESS to closest inch what length these fish are.
Most people guess wrong.