Ice Cream Overrun & Recipe Calculator

Ice Cream Making Guide

What Is Overrun?

Overrun: the percentage increase in volume of ice cream caused by air incorporation during churning. Overrun = (final volume − base volume) / base volume × 100. Cheap commercial ice cream: up to 100% overrun (half the product is air). Premium ice cream (Häagen-Dazs, Ben & Jerry's): 20-30% overrun. Denser, richer. Domestic machines: typically 25-40% overrun. Italian gelato: 25-35% (denser than American-style). Hard-pack vs soft-serve: hard-pack 30-50% overrun. Soft-serve 50-100% overrun. Why air matters: it's what gives ice cream its light, scoopable texture rather than being a solid block of frozen cream — too little overrun tastes dense and icy, too much tastes airy and insubstantial.

What's the key thing to understand about Basic Recipe Ratios?

Philadelphia-style (eggless, easy): 60% cream (double or whipping), 30% whole milk, 10% sugar by weight. 1L batch: 600mL cream + 300mL milk + 100g sugar = ~950g base + flavourings. French custard style: 50% cream, 30% milk, 12% sugar, 4-6 egg yolks per litre. Cooked to nappe stage (82°C) before chilling. Gelato: 40% cream, 50% milk, 10% sugar. Less air, less fat than American ice cream. Often uses milk powder for body. Sorbet: fruit purée + sugar syrup. Sugar level critical: 25-30% sugar by weight of the fruit purée, since sugar also affects the final texture and scoopability, not just sweetness — too little and the sorbet freezes rock-hard.

Why Sugar Levels Matter?

Sugar's role: 1. Sweetness. 2. Freezing point depression — prevents ice cream from freezing rock-hard. 3. Texture. Sugar molecules disrupt ice crystal formation. Higher sugar = softer ice cream. Lower sugar = harder. Recipe testing critical for sorbets. Too little sugar: rocks hard. Too much: never properly freezes — slushy. Refractometer: measures sugar concentration of fruit puree (Brix scale). Ideal sorbet: 28-32 Brix. Glucose, dextrose, and inverted sugar are alternative sugars used by professional ice cream makers, since they affect freezing point and texture differently than standard table sugar, giving finer control over softness.

What should I know about Equipment Comparison?

Freezer bowl machines (e.g. KitchenAid attachment, Cuisinart): require bowl frozen 24 hours in advance. Churns one batch then needs refreezing. Cost £30-100. Adequate quality. Built-in compressor machines (e.g. Magimix Le Glacier, Sage Smart Scoop): no pre-freezing required. Make batch after batch. £200-500. Significantly higher overrun and smoother texture. Worth it if making ice cream frequently. Commercial machines (e.g. Carpigiani, Taylor): hard or soft serve. Industrial output. Used in restaurants and ice cream parlours where consistent, high-volume production matters more than home-scale batch quality.