Overrun is the percentage increase in volume that occurs when air is incorporated into an ice-cream mix during freezing and churning. It affects the density, texture, mouthfeel and yield of ice cream, gelato and other frozen desserts. A lower overrun generally produces a denser product, while a higher overrun creates a lighter texture.
Overrun compares the volume of finished frozen product with the volume of the unfrozen mix used to make it.
Overrun (%) = [(finished product volume − mix volume) ÷ mix volume] × 100
For example, if 1 litre of mix produces 1.5 litres of finished ice cream, the overrun is 50%.
In production, overrun is often measured by comparing the weights of equal-volume samples of mix and finished ice cream. Because the finished product contains more air, the same volume weighs less.
Gelato is commonly produced with relatively low overrun, giving it a dense texture and concentrated flavour. Many premium ice creams also use modest overrun, while some mass-market products incorporate substantially more air. These are broad tendencies, not fixed legal definitions: actual overrun varies by style, recipe and producer.
Chef’s tip: Measure overrun consistently using the same sample volume and method. Use it alongside draw temperature, texture and melt performance when evaluating a frozen dessert.
Key distinction: Overrun measures air-related volume increase. It is not the same as fat content, water content or the amount of mix produced.
This term is one of hundreds covered in depth across OCS courses, learning paths, and 1-on-1 coaching with Chef Eric.
