The white pith under citrus peel holds most of the pectin that sets a marmalade, and that peel is what separates marmalade from the other three. Jelly is set, strained juice; jam is crushed fruit; preserves keep whole pieces. US law gives jam and preserves one standard, and marmalade none.
People usually tell jam, jelly and preserves apart by texture, but a US label is also a legal claim. Title 21, Part 150 of the Code of Federal Regulations sets standards of identity with minimum fruit and sugar content, and the National Center for Home Food Preservation (NCHFP) describes how each one is made at home. Between them they fill this table.
Jam vs jelly vs preserves vs marmalade, label by label
| Label | Made from | US federal standard | Minimum fruit to sugar, by weight | Minimum soluble solids |
|---|---|---|---|---|
| Jelly | Filtered or strained fruit juice | Yes, 21 CFR 150.140 | 45 to 55 | 65% |
| Jam | Crushed or chopped fruit | Yes, 21 CFR 150.160 | 47 to 55 for fruits such as strawberry and orange; 45 to 55 for others such as peach and apricot | 65% |
| Preserves | Whole fruit or uniform pieces | Same section and rules as jam | Same as jam | 65% |
| Marmalade | Citrus peel and juice in a jelly | None | None federally | None federally |
| Fruit butter | Fruit pulp cooked smooth and sieved | Yes, 21 CFR 150.110 | 5 to 2 | 43% |
| Fruit spread | Anything that misses a standard | None; a descriptive name | No minimum | No minimum |
| Conserve | Jam-like mixed fruit with nuts, raisins or coconut | None | No minimum | No minimum |
Soluble solids are mostly sugar, read with a refractometer.
That 65% line is the reason a low-sugar product can't be sold as jam in the US and gets called something else.
Is there a difference between jam and preserves?
Legally, none. Section 150.160 covers "fruit preserves and jams" in one set of rules, and its labeling clause lets the maker call the product "Preserve" or "Jam" alongside the fruit's name. The same recipe can go out under either word.
Home cooks still use the words differently. The NCHFP describes jam as chopped or mashed fruit cooked with sugar, and preserves as small whole fruit or uniform pieces in a clear, slightly gelled syrup, with the fruit left plump.
A spoonful of strawberry preserves should turn up a whole berry, and a spoonful of jam should not.
Jelly gets its own section. It has to start from juice, and pectin may be added only to make up for what the fruit lacks. No gelatin is involved: the set comes from pectin working with sugar and acid.
Where marmalade gets its set
Peel defines marmalade. The NCHFP's description is a soft, see-through jelly with shreds of peel or fruit spread evenly through it; jam and preserves may contain peel, but they don't rely on it.
The peel also sets the jar. A UC Master Food Preserver handout on orange marmalade, from the Solano and Yolo county program, has cooks leave the white albedo on the rind because that is where most of the pectin sits, and its recipe uses no boxed pectin. A short ingredient list shows the same thing on a label. Our Eureka Lemon Marmalade is cane sugar, California-grown Eureka lemons and water; the lemons do the setting, pith included.
Bitterness rides along with that pectin. Marmalade usually tastes more bitter than a jam of the same fruit, because the peel carries its bitter compounds into every spoonful along with its gelling power. Our guide to California marmalade ranks our eight varieties from sweetest to most bitter for that reason.
Marmalade vs preserves, and marmalade vs jam
Orange is on the FDA's Group I fruit list, so orange jam and orange preserves both need a fruit-to-sugar ratio no lower than 47 to 55, plus 65% soluble solids. An orange marmalade faces no federal ratio at all. Penn State Extension flags this for small producers: citrus marmalade made with the peel is outside the federal standards.
The jars look different too. Orange preserves give you soft pieces of the flesh in syrup, and orange jam is the fruit cooked down to a spread. Marmalade gives you strips of rind suspended in a gel.
Fruit butter and the unregulated spreads
Fruit butter has its own standard: fruit cooked to a smooth, semisolid spread, skins and seeds screened out, a fruit-to-sweetener ratio of at least 5 to 2 and 43% soluble solids. Eight fruits are named in it; apple and quince are two.
Fruit spread isn't a defined product at all. Penn State explains that anything under 65% soluble solids, or made from a fruit outside the FDA's lists, needs a name that doesn't pass it off as a standardized jam or jelly, such as "Strawberry Fruit Spread".
A conserve, in the NCHFP's definition, is a jam-like mix of several fruits with nuts, raisins or coconut. Like marmalade, it has no federal standard, so a maker could legally sell a chunky orange-and-walnut conserve under that name with any fruit ratio. Single-fruit citrus jars without nuts, like everything in our marmalade collection, stay marmalade.
Photo by Sharon Waldron on Unsplash.
