What the percentage on a chocolate bar does and does not tell you

Seventy percent on a wrapper can look like a score, but the number is a measure of weight. Bar & Cocoa, a shop that sells craft bars, defines it as the percent of the bar's weight contributed by cacao beans. Nicole Patel, founder of Delysia Chocolatier, told Tasting Table that the figure covers cocoa solids and cocoa butter together. The rest of a 70 percent bar is usually sugar. Everything else you taste, from a soft melt to a firm snap, depends on more than that one figure.

What the number tells you

Simple subtraction gives you the most reliable thing on the label, which is how much room is left for everything else. In a dark bar that remainder is mostly sugar, and more of it makes a softer bar. Tasting Table notes that it can also hold emulsifiers and flavorings, plus dairy in milk chocolate. At the far end, The Staff Canteen describes a 100 percent bar as chocolate liquor with no sugar at all.

You also get a rough steer on flavor and feel. Patel's general rule is that a higher percentage brings more intense chocolate flavor and less sweetness. A lower one brings a sweeter, creamier bar. She describes bars at 70 percent and above as often intense and sometimes bitter. People who want sweetness, she says, should look under 50. The same article adds that more cacao makes a bar harder, denser and snappier. More sugar and other ingredients make it softer and quicker to melt.

American food law gives the number a floor for some names, set at a fairly low level. The FDA standard of identity for sweet chocolate requires at least 15 percent chocolate liquor. Semisweet and bittersweet require at least 35 percent. Milk chocolate needs at least 10 percent. White chocolate is measured differently, at no less than 20 percent cacao fat.

Those rules calculate liquor with their own formula. It removes the cacao fat and multiplies the rest by 2.2, so a legal figure will not always match the wrapper's. The practical point is that bittersweet covers a very wide range, and the word alone tells you little.

What the number hides

The biggest gap is the split between solids and butter, which the percentage adds together even though the two behave differently on a warm tongue. Bar & Cocoa says cacao beans are roughly half fat and half solids by weight. The Staff Canteen works this through for a 70 percent bar with no added cocoa butter, and gets about 35 percent of each. The FDA range for chocolate liquor is 50 to 60 percent cacao fat, so that even split is an approximation.

Added cocoa butter moves the balance without moving the headline number, which can change the way a bar melts on a warm tongue. Take a 70 percent bar in which 10 of those points are added butter, leaving 60 from ground cacao. By the half and half rule, that bar has about 30 percent solids and 40 percent fat. A bar with none added sits at 35 and 35. Tasting Table credits the solids with the strong, bitter, aromatic chocolate flavor and the butter with a creamy, smooth melt. Makers do choose differently here. Dandelion Chocolate uses only cocoa beans and cane sugar with no added butter. Pump Street Chocolate grinds its nibs with sugar and cocoa butter.

Quality is the other thing the number leaves out. Patel told Tasting Table that the percentage reflects cocoa content and flavor intensity. It does not show how well the chocolate was made or how smooth it will taste. The article lists what does bear on quality, including bean type and growing, quality control, the roast, conching, tempering and additives. The writer behind Chocolate Noise makes the same point with a pair of 70 percent bars. That writer says wonderful low-percentage bars and terrible high-percentage ones both exist.

Research points the same way. University of Copenhagen scientists, in a 2019 study summary, found that the treatment cacao receives after harvest is at least as important for quality and flavor as its genetics. None of that handling shows up in a percentage. Neither does treatment with alkali, which the FDA standard says must be declared with wording such as "processed with alkali". The Institute for Cacao and Chocolate Research, formerly the Fine Cacao and Chocolate Institute, describes quality checks built on tasting. They cover raw beans, chocolate liquor and finished chocolate in turn.

How to use the number when you shop

Treat the percentage as a sweetness dial and let other information answer the remaining questions. If a 70% bar suits you, an 85% bar will generally leave less room for sugar and a 55% bar more. That comparison works best inside one maker's range, and some makers offer the same cacao at two levels. Bar & Cocoa lists Auro's Saloy and Qantu's Chuncho at both 70% and 100%. With those pairs you can taste what the number changes with the same bean.

The back of the wrapper usually tells you more than the front. Under FDA labeling rules, ingredients are listed in descending order of predominance by weight. So the list shows what dominates and whether cocoa butter was added, though not how much. Bar & Cocoa also advises checking that list for cheaper vegetable oils in place of cocoa butter, especially on low-percentage milk bars. Pump Street's wrappers show how far the rest of the label can go, with country, farm, crop year and batch code all printed.

White and milk bars are different, because their figures count something else. Bar & Cocoa explains that white chocolate holds cocoa butter and no cocoa solids. A 32 percent white bar is telling you its share of cocoa butter. For milk chocolate, the same source says the figure includes both cacao beans and added cocoa butter. So a 50 percent milk bar and a 50 percent dark bar are built differently even with matching numbers. A 70 on its own doesn't say how much of that is fat.