What is the standard ganache ratio for pralines?

The standard ratio for praline fillings (bonbons) is 2:1 — two parts dark chocolate to one part cream by weight (e.g. 333 g chocolate to 167 g cream). This produces a pipeable texture, water activity around 0.82–0.85, and a shelf life of 10–14 days refrigerated.

What is the ratio for truffle ganache?

Classic hand-rolled truffles use a 1.5:1 to 2:1 ratio. The softer the ganache, the more it spreads — 1.5:1 gives a very creamy centre; 2:1 gives a firmer centre that holds its shape after rolling.

What ganache ratio has the longest shelf life?

Higher chocolate ratios lower water activity (aw) and extend shelf life. A 4:1 ratio (4 parts chocolate to 1 part cream) can last 3–5 weeks refrigerated. Adding glucose or invert sugar also extends shelf life by binding free water regardless of ratio.

What is the ganache ratio for a chocolate glaze?

For a pourable glaze or sauce, use a 1:1 ratio (equal parts chocolate and cream by weight). It sets loosely at room temperature and stays fluid when warm. For a firmer, shinier glaze that sets harder, move to 1.5:1.

Ganache Ratio Chart: 1:1 to 4:1

The chocolate-to-cream ratio is the single most important variable in ganache. It controls texture, water activity, shelf life, and how you can use the final product. This is the complete reference.

Complete Ratio Reference Table

All values are for dark chocolate (65–70% cacao) with heavy cream (35% fat), no added sugars or fats. Adding glucose or butter shifts aw and shelf life — see the formula section below.

Ratio (choc:cream)	Texture at 20°C	Water activity (aw)	Shelf life (refrig.)	Best use
1:1	Very soft, barely sets	0.92–0.95	3–5 days	Sauce, glaze, fondue
1.5:1	Soft, spreadable	0.88–0.92	5–8 days	Frosting, soft filling, truffle centre
2:1	Firm, pipeable	0.82–0.86	10–14 days	Praline filling, piped bonbons ★ Standard
2.5:1	Medium firm	0.77–0.82	14–21 days	Praline filling, slabbed ganache
3:1	Firm, holds shape	0.72–0.77	21–28 days	Cut ganache, moulded squares
4:1	Very firm, snaps	0.65–0.72	28–42 days	Shelf-stable centres, enrobed squares

★ 2:1 is the industry standard starting point for praline fillings. Adjust up for firmer texture and longer shelf life, down for creamier centres.

aw values are approximate. Actual aw depends on chocolate cacao %, cream fat %, and added sugars. Use the Ganache Formula Builder for precise calculation.

Ratio Profiles in Detail

1:1

Sauce / Glaze

Example: 100 g chocolate, 100 g cream
Texture: Pourable when warm, barely sets cold
aw: 0.92–0.95 (high — refrigerate always)
Shelf life: 3–5 days refrigerated
Tip: Add 10–15 g glucose for shine and to prevent crystallisation

1.5:1

Soft Filling / Truffle

Example: 150 g chocolate, 100 g cream
Texture: Spreadable, just barely pipeable cold
aw: 0.88–0.92
Shelf life: 5–8 days refrigerated
Tip: Ideal for hand-rolled truffles. Roll while still slightly soft (16–18°C)

2:1

Standard Praline Filling ★

Example: 333 g chocolate, 167 g cream
Texture: Firm, smooth, pipeable at 28–30°C
aw: 0.82–0.86
Shelf life: 10–14 days refrigerated
Tip: Add 20 g glucose + 15 g butter for optimal emulsion and mouthfeel

2.5:1

Medium Firm / Slabbed

Example: 250 g chocolate, 100 g cream
Texture: Holds shape well, sliceable cold
aw: 0.77–0.82
Shelf life: 14–21 days refrigerated
Tip: Good for layered confections and flavoured frames

3:1

Cut Ganache

Example: 300 g chocolate, 100 g cream
Texture: Firm, cuts cleanly with a guitar cutter
aw: 0.72–0.77
Shelf life: 21–28 days refrigerated
Tip: Standard ratio for enrobed squares. Rest 24 h before cutting

4:1

Shelf-Stable / Dense

Example: 400 g chocolate, 100 g cream
Texture: Very firm, almost snaps
aw: 0.65–0.72
Shelf life: 28–42 days refrigerated
Tip: Requires very precise emulsification — consider adding 5 g lecithin

How Additions Affect the Ratio

The base ratio is just chocolate and cream. Every additional ingredient shifts aw and texture:

Glucose syrup (10–20 g per 500 g ganache)
Lowers aw, extends shelf life, improves gloss and prevents crystallisation. Counts as part of the liquid weight — adjust cream slightly.

Invert sugar / trimoline (10–30 g)
Stronger aw reduction than glucose. Also adds softness and delays drying. Common in long shelf-life pralines.

Butter (15–30 g, added below 34°C)
Increases fat content, improves mouthfeel and gloss. Does not affect aw significantly but changes texture — makes ganache firmer when cold, silkier when warm.

Alcohol (spirits, liqueurs)
Lowers aw via antimicrobial effect. Use 10–30 g per 500 g. Too much prevents setting. Account for sugar content in liqueurs.

The Mathematics Behind Every Ratio

A ratio is a shorthand. What it actually controls is the balance between five primary variables that determine texture, flavour release, and shelf life. Understanding the mathematics lets you adapt any ratio to any chocolate type with precision.

Mass Unity: The Foundation of Every Ratio

Every ganache, at every ratio, must satisfy one constraint: all components sum to 100% of total weight. The ratio you choose distributes weight across these five primary variables.

Variable	Represents	Increases with	Effect on ratio
L	Total lipids	Higher chocolate %, more butter	Firms ganache, raises H
S_o	Oil-wettable solids	Higher cocoa % in dark chocolate	Structural network, raises H
S_w	Water-wettable solids	Milk proteins, non-sugar dry	Emulsion anchor points
W	Free & bound water	More cream, fruit purée, juice	Softens ganache, raises a_w
S	Total dissolved sugars	Glucose, invert sugar, sucrose	Lowers a_w, prevents crystallisation

Mass Unity:       L + S_o + S_w + W + S = 1.0

Hardness (H):      H = [SFC(CB + AMF) + x·S_o] ÷ (W + O)
  → Higher chocolate ratio = more L + S_o = higher H
  → More cream = more W = lower H

Emulsion Ratio:   ER = (aL + bS_o) ÷ (cW + dS + bS_w)
  → ER ≤ 1.0 = water-continuous: immediate fruit / herb notes
  → ER > 1.0 = fat-continuous: prolonged finish, spice & roast notes

What Changing the Ratio Actually Changes

Every ratio shift moves multiple variables simultaneously. This is why ratio changes must be calculated, not estimated.

↑Increasing chocolate ratio

L risesMore cocoa butter → firmer set
S_o risesMore cocoa particles → stronger crystal network
W fallsLess free water → lower a_w → longer shelf life
H risesHarder, more sliceable texture
ER risesFat-continuous → roast/spice notes dominate

↑Increasing cream ratio

W risesMore free water → higher a_w → shorter shelf life
L falls (relative)Softer, more pipeable
H fallsSofter texture, higher risk of not setting
ER fallsWater-continuous → fruit / herb top-notes first
a_w risesMust compensate with glucose or invert sugar

↑Adding invert sugar / glucose

S risesMore dissolved sugars → lower a_w
W falls (bound)Sugar binds free water → longer shelf life
CrystallisationInhibited → stays pipeable longer
TextureSofter, glossier, more elastic

Frequently Asked Questions

What ratio do I use for milk chocolate ganache?

Milk chocolate has more milk solids and usually less cocoa butter than dark, so it melts softer. Use 2.5:1 to 3:1 for a firmness equivalent to 2:1 dark ganache. White chocolate is even softer — start at 3:1.

Can I substitute other liquids for cream?

Yes. Fruit purées, alcohol, tea, coffee, or infused milks all work as partial or full cream replacements, but each has different fat and water content. Purées typically have lower fat — compensate by increasing the chocolate ratio slightly. Use the Ganache Formula Builder to recalculate aw when substituting.

Why does my ratio vary between sources?

Most recipes give approximate ratios without specifying the cacao percentage of the chocolate, the fat % of the cream, or whether additional fats/sugars are included. A 2:1 ratio with 70% dark and 35% cream behaves very differently from the same ratio with 55% chocolate and 20% cream.

How does the ratio affect water activity (aw)?

Higher chocolate ratios reduce the proportion of free water in the ganache, lowering aw. Lower aw means slower microbial growth and longer shelf life. Every 0.5 increase in the chocolate ratio reduces aw by roughly 0.05–0.08 points (varies with cacao % and added sugars).

Related Science

Part of the Chocolate Atelier knowledge network — each page is connected to the science it depends on.

→ Chocolate Ganache: Full Science Reference

→ Key Raw Materials: Sugar & Fat Behaviour

→ Ganache Split: Ratio-Driven Failures

→ Food Science: Emulsion Ratio (ER) Guide