How Much Calcium Is In A Slice Of Cheese? | It Depends

You already know cheese is a decent source of calcium. The natural assumption is that a slice is a slice — cheddar, Swiss, provolone, they all probably deliver a similar amount. But if you’ve ever compared a hunk of Parmesan to a wedge of Brie, you’ve tasted the difference moisture and processing make.

The honest answer is that type of cheese matters more than you might think. A standard slice of hard cheese lands around 200 mg of calcium, but soft, young cheeses can deliver as little as 50 mg per ounce. Here is how the calcium landscape looks across the cheese counter.

Defining The ‘Standard’ Slice

Nutrition labels use a 1-ounce (28-gram) serving as their baseline. For block cheeses like cheddar, Swiss, or Monterey Jack, that weight roughly matches a typical deli slice or a thick home-cut piece. At this weight, hard cheeses provide about 200 mg of calcium per serving, a figure consistently reported by UCSF Health and the University of Washington bone physiology database.

A 1-ounce serving of mozzarella and part-skim string cheese also checks in near the 200 mg mark. Fresh cheeses with higher moisture content, like ricotta or cottage cheese, dip lower, providing around 138 mg per ounce. The pattern is clear: the less water in the cheese, the more calcium fits into that ounce.

The Weight Variable

Slice thickness varies widely. A thick cut from a block can easily reach 40 grams, pushing the calcium closer to 200 mg. A thin deli slice at 15 grams cuts the number roughly in half. Weighing your cheese is the most reliable way to know what you are actually getting.

Why The Calcium Content Varies So Much

Calcium in cheese is mostly tied to the protein network that forms during curdling. Hard cheeses are pressed and aged, squeezing out whey and water, which concentrates the protein and the calcium bound to it. Soft cheeses skip much of that pressing, retaining water that dilutes the mineral density per gram.

• Cheddar and Mozzarella: Standard 1-ounce servings provide around 200 mg of calcium. These are reliable, mid-range sources.
• Feta: At roughly 270 mg per ounce, crumbled feta is surprisingly dense. Its brine curing process helps preserve the calcium.
• Parmesan (Grated): A 1-tablespoon serving (about 5 grams) provides 70 mg. An ounce of solid Parmesan is comparable to cheddar.
• American Cheese: A single 20.6-gram slice provides about 178 mg of calcium, roughly 17% of the RDA, according to Verywell Fit nutrition data.
• Brie: Soft-ripened cheeses contain about 50 mg of calcium per ounce. The creamy texture comes from fat and water, not calcium density.

The range from 50 mg to 270 mg per ounce demonstrates why blanket assumptions about cheese and calcium don’t hold up. The cheese-making process itself determines the final concentration.

Calcium From Your Cheese Counter

How much of that calcium actually contributes to your daily needs? A 1-ounce serving of cheddar covers about 15% of the Daily Value (DV) for calcium, a figure the cheddar cheese DV calcium breakdown from Healthline confirms. Mozzarella and Swiss land in a similar range.

A portion of that calcium is bound as insoluble calcium phosphate within the curd structure. While bound calcium is less immediately soluble, it may release steadily during digestion, providing a sustained mineral supply rather than a rapid spike.

Here is a comparison of total calcium across common cheeses based on a standard 1-ounce (28-gram) serving.

Cheese Type	Calcium (mg)	% Daily Value (DV)
Feta	~270 mg	~27%
Hard Cheese (Cheddar, Swiss)	~200 mg	~20%
Mozzarella (Part-Skim)	~200 mg	~20%
American Cheese (20.6g slice)	~178 mg	~18%
Fresh Cheese (Cottage, Ricotta)	~138 mg	~14%
Brie	~50 mg	~5%

These percentages are based on the standard adult DV of 1,000 mg. Individual needs can be higher during pregnancy, adolescence, or post-menopause, so these figures are rough guides rather than precise targets.

Four Factors That Change The Final Count

The averaged numbers in the table are useful starting points, but real-world cheese varies. Several factors can shift the calcium content of the cheese you actually bring home.

1. Moisture Content: Younger, wetter cheeses contain less calcium per gram. Cream cheese and fresh mozzarella will consistently fall below aged cheddar in a like-for-like weight comparison.
2. Curd Treatment: Cheeses washed in hot water or brine during processing can lose a fraction of their calcium to the liquid. Mozzarella and provolone are common examples where this occurs.
3. Fat Percentage: Calcium binds to protein, not fat. Lower-fat versions of a cheese often have a slightly higher calcium concentration by weight because the protein ratio shifts upward.
4. Aging Time: Extended aging allows calcium phosphate crystals to form, but total calcium remains stable. Protein content remains the stronger predictor of final calcium density in aged cheeses.

If you track calcium closely for bone health or dietary reasons, weighing the cheese you eat is considerably more accurate than relying on slice counts. A food scale removes the guesswork entirely.

What Research Says About Cheddar’s Calcium

A 2024 study in JDS Communications took a close look at how calcium is distributed inside cheddar cheese. Researchers developed an acid-base auto-titration method to measure insoluble calcium — the portion tightly bound to the curd protein. They found that cheddar with a pH of 5.25 contained 0.67 percent insoluble calcium, the highest level among the cheeses tested, which the cheddar insoluble calcium study on PubMed attributes to its high protein content of 26 percent.

Insoluble calcium is less available during the first moments of digestion, but that doesn’t mean it is wasted. The slow release of bound calcium may provide a steadier supply to the body compared to the rapid availability found in calcium-set tofu or supplemented foods.

The practical takeaway from the research is straightforward: cheddar’s well-known 200 mg per ounce is a solid, research-backed number. Whether your body uses all of that total depends on individual digestive factors and the specific batch of cheese.

Serving	Approximate Calcium
1-inch cube of cheddar	~200 mg
1 slice of American cheese	~178 mg
1 cup of prepared mac and cheese	~250 mg
1 tablespoon grated Parmesan	~70 mg

The Bottom Line

A slice of cheese ranges from roughly 50 mg of calcium for soft, creamy varieties to over 270 mg for dense cheeses like feta. A standard slice of cheddar or Swiss provides about 200 mg, making cheese a flexible contributor to your daily needs when you account for type and portion size.

For personalized calcium targets based on your age, sex, or specific dietary plan, a registered dietitian can help you match cheese choices to your individual needs without guessing.