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Good old Miracle Worker formula. Take your original estimate and double it. =)

I've taken to doubling my estimate and then stepping up to the next order of magnitude.

Eg. 2 hours becomes 4 days. It allows for delivery, QA, bug fixes and documentation.

Initial estimation * 2 is my way nowadays.

Golden formula of time estimation!

How unscientific - 3.14 is the way to go.

shitty the boss with excel yelling about bad estimations -> add more pi-decimals.

Just use Scotty's rules :)