Your real odds from a drop rate and number of pulls - and how many pulls you need to hit a target chance. Free, no signup.
The chance of getting at least one is 1 minus the chance of missing every time: 1 - (1 - rate) to the power of pulls. This tool does it instantly.
No - at 1% over 100 pulls your chance is about 63%, not 100%. Rates without pity are independent each pull.