Drop rate

Drop rate is the share of a delivered quantity that has disappeared after a stated period, measured by comparing the current count with the start count plus the quantity delivered.

The arithmetic is simple. If an order of 1,000 followers started at 5,000 and the account shows 5,900 a month later, 100 of the 1,000 are gone, and the drop rate over that month is one in ten. Sellers and buyers usually write it as a percentage, but the number only means something with two other facts attached: the period it covers and the date it was measured.

Both facts change the figure. Drops are not spread evenly over time, so a rate measured a few days after delivery can look very different from one measured after a platform cleanup weeks later. And a rate measured on one batch describes that batch's supplier at that moment; when a panel switches supplier behind the same service name, the old figure no longer applies.

Organic movement distorts the measurement in both directions. An account that gains followers on its own hides drops, and one that loses followers for unrelated reasons makes the service look worse than it is. A cleaner measurement uses a quiet account, or a post that attracts little organic activity, and records the count at fixed intervals from the day delivery completes.

A drop rate printed in a service description is a seller's claim unless it says when and how it was measured. Treat an undated rate as a description of what the seller expects, and compare it against the refill terms, which are the part of the listing that actually commits the panel.