Plums are a refreshing summer fruit, but are they a meaningful source of calcium? The short answer is that raw plums contain only about 6 mg of calcium per 100 g — modest compared with dairy or fortified plant milks. Even so, every bit of mineral nutrition matters when you are tracking bone health, following a vegan diet, or keeping a detailed food diary. This Plum Calcium Calculator turns any serving size into exact milligrams of calcium and shows how it fits into your daily target.
Enter your serving in grams, ounces, cups of sliced plums, or whole medium plums. The tool instantly converts that to total calcium, serving weight, and percent Daily Value based on the FDA reference of 1300 mg. Quick-fill buttons cover common portions, and a step-by-step breakdown shows exactly how the conversion works, so you can verify the numbers or adapt them to a different plum variety.
🥛 Plum Calcium Calculator
How much calcium is in your plums?
Uses USDA value for raw plums: 6 mg calcium per 100 g.
📊 Results
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How to Use This Calculator
This calculator is for anyone tracking calcium from fruit, whether you are following a bone-health plan, keeping a food diary, or just curious about the mineral content of a typical plum. Enter a number in the serving-size field, then choose the matching unit: grams, ounces, cups of sliced plum, or whole medium plums. The quick-fill buttons give you one-tap options for 1 medium plum, 5 plums, 1 cup sliced, and 100 g.
After you press Calculate, the tool shows total calcium in milligrams, the equivalent weight in grams, and the percentage of the FDA Daily Value for calcium (1300 mg). A short breakdown displays every step of the conversion so you can check the math or adapt it for a different plum variety. Use Reset to return to the default 1 g serving.
Plum Calcium at a Glance
Raw plums are not a concentrated calcium source, but they contribute small amounts of vitamin C, vitamin K, potassium, and fiber. The values below are based on USDA FoodData Central data for raw plums.
| Portion | Approx. Weight | Calcium | % Daily Value |
|---|---|---|---|
| 1 small plum | 55 g | 3.3 mg | 0.3% |
| 1 medium plum | 66 g | 4.0 mg | 0.3% |
| 1 cup sliced plum | 165 g | 9.9 mg | 0.8% |
| 100 g raw plum | 100 g | 6.0 mg | 0.5% |
| 1 oz raw plum | 28.4 g | 1.7 mg | 0.1% |
See the USDA FoodData Central database for more nutrient details. Individual plums vary by variety and ripeness, so the calculator keeps a fixed density for consistent results.
The Math Behind the Calculation
The formula is: calcium (mg) = weight in grams × calcium per 100 g ÷ 100. Weight is first converted to grams using these factors.
- 1 gram = 1 g
- 1 ounce = 28.3495 g
- 1 cup sliced plums ≈ 165 g
- 1 medium plum ≈ 66 g
With 6 mg per 100 g, the multiplier is 0.06 mg per gram. The calcium result is divided by 1300 mg and multiplied by 100 to show the percent Daily Value, matching the FDA labeling convention.
Worked Examples
Example 1: 150 g of plums
150 × 6 / 100 = 9.0 mg calcium. Percent DV: 9.0 ÷ 1300 × 100 = 0.7%.
Example 2: 3 medium plums
3 × 66 = 198 g. 198 × 0.06 = 11.9 mg. Percent DV: 0.9%.
Example 3: 8 oz of plums
8 × 28.3495 = 226.8 g. 226.8 × 0.06 = 13.6 mg. Percent DV: 1.0%.
Even a generous bowl of plums contributes only about 1% of the Daily Value for calcium, so plums are best used as a refreshing complement to calcium-rich foods rather than a primary source.
Tips for Using Plum Calcium in Your Diet
- Keep your units consistent when logging plums so daily calcium totals stay comparable.
- Pair plums with yogurt, fortified plant milk, or almonds to make a more meaningful calcium snack.
- Watch canned plums: some products contain calcium chloride, so check the label if you rely on canned fruit.
- Look at weekly calcium averages rather than a single fruit serving.
- If you manage kidney stones or another medical condition, talk with a clinician before changing calcium intake.
Frequently Asked Questions
Are plums a good source of calcium?
Plums are low in calcium compared with dairy products, leafy greens, and fortified foods. A medium plum provides about 4 mg, which is less than 0.5% of the Daily Value. The amount still contributes to your overall fruit intake and micronutrient variety.
Do prunes contain more calcium than fresh plums?
Yes. Prunes are dried plums, and drying concentrates nutrients. Prunes have roughly 43 mg of calcium per 100 g versus 6 mg in fresh raw plums. This calculator uses the fresh raw value.
Why is the Daily Value 1300 mg instead of 1000 mg?
The 1300 mg figure is the FDA reference amount used for Nutrition Facts labels. Age-specific recommendations from the National Institutes of Health are 1000 mg for most adults and 1200 mg for women over 50 and men over 70. See the NIH Calcium Fact Sheet for details.
Can I use this calculator for canned or cooked plums?
The tool assumes raw, fresh plums. Plain cooked plums have similar calcium content, but canned products may vary. For other fruit calcium comparisons, try the fig calcium calculator and the nectarine calcium calculator.