The Burndown Rate or Velocity is value used to determine how much workload a Team is able to accomplish during a Sprint. It is calculated in retrospective as the sum of Story Points done so far divided by the number of finished Sprints. The Burndown Rate can be used as an estimate on how much workload in sprints is left on the Product Backlog. The Burndown Rate is the numerical representation of the Burndown Chart. As with any Estimate and future projection, the Burndown Rate should be considered with a big uncertainty on its actual representativeness.