Ganache ratios: why the same recipe fails with milk chocolate

The ratio depends on the chocolate type, not on the recipe. Dark 2:1, milk 3:1, white 4:1 — and most ganache failures are this and nothing else.

intermediate

A grid of six ganache ratios. Rows are dark, milk and white chocolate; columns are firm and soft. Dark is two to one firm and one to one soft, milk is three to one and two to one, white is four to one and three to one, all chocolate to cream by weight. The cells sharing a ratio across different rows are outlined. — Ganache is a grid rather than a ratio. The same number means opposite things in different rows, which is why one figure on its own is not the answer. Generated from ChocolateHQ’s own records rather than drawn or photographed.

If you read nothing else

Dark 2:1, milk 3:1, white 4:1 by weight for a firm ganache. A loose ganache is almost always a ratio error, and chilling will not fix it.

Why the type changes the ratio

Ganache sets because cocoa solids and cocoa butter build a structure through the water phase. Milk chocolate has fewer cocoa solids per gram and softer milk fat; white chocolate has no cocoa solids at all.

So the same weight of cream needs progressively more chocolate as you move from dark to milk to white. Roughly: 2:1 for dark, 3:1 for milk, 4:1 for white, by weight, for a firm ganache.

Ratios by purpose

For dark chocolate: 1:1 gives a soft ganache for whipping or a pourable glaze; 2:1 gives a firm truffle centre; 3:1 gives something firm enough to cut into slabs for enrobing.

Adjust upward by one step for milk and two for white. A white chocolate glaze at 1:1 will never set, and that is arithmetic rather than technique.

The failure everyone has

A milk or white chocolate ganache made at the dark ratio stays loose no matter how long it is refrigerated. It is not under-chilled and it is not broken — there is simply not enough chocolate in it.

The fix is to melt in more chocolate of the same type until the ratio is right. Refrigeration cannot compensate for a ratio problem, and hours in the fridge waiting for it to firm up are hours wasted.

What else shifts the ratio

Adding butter softens the set, so compensate with more chocolate. Adding alcohol adds liquid — count it as cream. Replacing cream with a lower-fat liquid gives a firmer but less rich result, because fat is doing part of the softening.

Infusing the cream and straining loses some of it with the solids, which quietly changes the ratio. Weigh the cream after straining, not before.

Covered in this guide

Making ganacheThe method this guide gives the arithmetic for.
Making trufflesThe application where the ratio matters most.
White chocolateThe type that breaks the standard ratio most dramatically.

Sources

ChocolateHQ editorial synthesis — ChocolateHQ(citation identity confirmed; passage not re-read)
The Science of Chocolate — Royal Society of Chemistry(citation identity confirmed; passage not re-read)