Hopper Transfer Rates
A single vanilla hopper moves one item every 8 game ticks (2.5 items/second) - work out throughput, or dial in a custom/modded speed like DonutSMP-style servers use.
Throughput
Parallel hoppers each feeding their own line into a shared output add their rates together - this assumes nothing is bottlenecking downstream.
Items per Second
Items per Minute
Reverse: Hoppers Needed
Hoppers Needed
Based on the 2.5 items/second vanilla rate above.
Donut Hopper / Modded Server Speed
Servers like DonutSMP run modded/plugin hoppers with a configurable transfer delay instead of vanilla's fixed 8 ticks/item - some configs go as low as 1 tick/item (8× vanilla speed), and server marketing sometimes advertises even bigger multipliers on top of that (e.g. via stacked hopper minecarts or custom logic) that we can't verify exactly, so treat those numbers as approximate. Enter your server's actual tick delay below to get a real number.
Items per Second
Speed vs Vanilla