A sales forecast is a prediction of how much revenue a team will close in a given period, built from the pipeline and its likely win rate. It is not a guess; it is a rolling number that managers recompute from committed deals, expected closed-won outcomes, and the sales cycle length. Forecasts drive hiring, budget, and quota setting, so they are taken seriously — a rep who constantly misses the forecast loses trust even when they are closing. Your quota attainment is the anchor the whole forecast rests on.
In plain English
A forecast is the team's best answer to "what will we actually book this quarter?" Reps call their deals with a confidence level, managers roll those up, and the number becomes the target the company plans around. It changes every week as deals move, stall, or die.
Why it matters to you
Being good at forecasting is a quiet superpower. When you can tell your manager which deals will close and which are smoke, you become the person they trust with territory and pipeline decisions. In interviews, talk about how you kept your own forecast honest — it signals maturity beyond the activity.
For forecasting with integrity, see Forecast Like an AE.