Drinks Per Guest Calculator

About this calculator

This calculator multiplies guest count × party duration in hours × drinks per guest per hour — commonly one drink per hour as a planning baseline — to estimate the total number of drinks to have on hand, a simple linear model that party planners adjust upward for events with heavier-drinking crowds or downward for daytime and family gatherings.

Event planners and caterers use this baseline to translate a guest list and event length directly into a bottle or case count for purchasing, while home hosts use it to avoid the two common failure modes of party planning: running out of drinks mid-event or buying far more alcohol than the party will ever consume.