Minerals & electrolytes
Calcium
A mineral from dairy, tofu and leafy greens. Your body needs it to build bones and teeth, and for muscles and nerves.
88 products from US online stores, sorted by what 500 mg of calcium costs – not by the price per pack.
2.5¢Lowest cost
per 500 mg calcium
- Prices checked Nov 1, 2026, US
- No paid placements
What does 500 mg mean?
- calcium per serving in most of the products we checked
- 125–1,000 mgcalcium per serving in most of the products we checked
We compare by 500 mg only so products line up – it’s not a recommendation. Not medical advice.
Where products miss quality points
How the 88 products score
- Very good 90+: 1
- Good 75+: 70
- Fair 60+: 0
- Low under 60: 17
3 products contain titanium dioxide – a food authority has banned, restricted or flagged it as a possible health risk. Their score is cut in half, so it’s always in the red range. Each product says why.
- have no seal from an independent testing program
- 98%have no seal from an independent testing program10 of 30 testing points for GMP, 15 for the 9 whose label says “third-party tested”
- use a weaker form
- 17%use a weaker form6 of 30 form points – most often the label doesn’t say which form it is
The full 30 testing points need an independent test. Every supplement sold in the US is made under the FDA’s GMP rules – the maker checks its own products, which gives 10 points. A seal from a testing program like NSF, USP or Informed Choice means a lab outside the company checks that what’s inside matches the label. Most brands don’t take part. That doesn’t make a product bad – without a seal, a clean product still gets up to 80.
We find seals on the label and in NSF’s public lists. USP and Informed Choice don’t let us search their lists automatically, so a seal that’s only in their lists can be missing. How the score works
Pack size
Compare packs of a similar size.
All sizes in one list can affect the results – big packs usually cost less per 500 mg. Pick a size above to compare packs that are alike.
88 products · cheapest per 500 mg calcium first
- Rank 1
21st Century
Calcium Supplement 600
Carbonate · Tablets
80Good qualityCountry not stated2.5¢per 500 mg
Lowest
- Pack
- $11.99400 tablets
- Calcium per serving
- 600 mgin 1 tablet
- Pack lasts
- 400 daysif you take 1 tablet (600 mg) a day
vitacost.com (opens in a new tab)Checked Nov 1, 2026 · Label
- Rank 2
Best Naturals
Calcium Carbonate Powder
Carbonate · Powder
80Good qualityMade in USA3.2¢per 500 mg
29% more
- Pack
- $10.95454 g (1 lb)284 servings
- Calcium per serving
- 600 mgin 1.6 g
- Pack lasts
- 340 daysif you take 500 mg a day
shopbestnaturals.com (opens in a new tab)Checked Nov 1, 2026 · Label
- Rank 3
Vitamatic
Calcium Carbonate Powder
Carbonate · Powder
80Good qualityCountry not stated3.9¢per 500 mg
57% more
- Pack
- $15.68500 g (1.1 lb)250 servings
- Calcium per serving
- 800 mgin 2 g
- Pack lasts
- 400 daysif you take 500 mg a day
vitacost.com (opens in a new tab)Checked Nov 1, 2026 · Label
- Rank 4
NOW Foods
Calcium Carbonate Pure Powder
Carbonate · Powder
80Good qualityPacked in USA4.1¢per 500 mg
63% more
- Pack
- $9.79340 g (12 oz)200 servings
- Calcium per serving
- 600 mgin 1.7 g
- Pack lasts
- 240 daysif you take 500 mg a day
vitacost.com (opens in a new tab)Checked Nov 1, 2026 · Label
- Rank 5
Nutricost
Calcium Carbonate, Unflavored
Carbonate · Powder
85Good qualityPacked in USA4.3¢per 500 mg
72% more
- Pack
- $13.95500 g (1.1 lb)250 servings
- Calcium per serving
- 650 mgin 2 g
- Pack lasts
- 325 daysif you take 500 mg a day
vitacost.com (opens in a new tab)Checked Nov 1, 2026 · Label
- Rank 6
Mason Natural
Calcium, 600 mg
Carbonate · Tablets
30Low qualityCountry not stated4.5¢per 500 mg
82% more
- Pack
- $5.45100 tablets
- Calcium per serving
- 600 mgin 1 tablet
- Pack lasts
- 100 daysif you take 1 tablet (600 mg) a day
vitacost.com (opens in a new tab)Checked Nov 1, 2026 · Label
- Rank 7
Nutricost
Calcium Carbonate Powder
Carbonate · Powder
85Good qualityCountry not stated4.9¢per 500 mg
97% more
- Pack
- $15.97499 g (1.1 lb)250 servings
- Calcium per serving
- 650 mgin 2 g
- Pack lasts
- 324 daysif you take 500 mg a day
nutricost.com (opens in a new tab)Checked Nov 1, 2026 · Label
- Rank 8
21st Century
Calcium Supplement 600
Carbonate · Tablets
30Low qualityCountry not stated5.5¢per 500 mg
122% more
- Pack
- $4.9975 tablets
- Calcium per serving
- 600 mgin 1 tablet
- Pack lasts
- 75 daysif you take 1 tablet (600 mg) a day
vitacost.com (opens in a new tab)Checked Nov 1, 2026 · Label
- Rank 9
BulkSupplements
Calcium Carbonate Powder
Carbonate · Powder
80Good qualityCountry not stated5.7¢per 500 mg
130% more
- Pack
- $22.97400 servings
- Calcium per serving
- 500 mg
- Pack lasts
- 400 daysif you take 500 mg a day
bulksupplements.com (opens in a new tab)Checked Nov 1, 2026 · Label
- Rank 10
BulkSupplements
Calcium Acetate Powder
Not stated on the label · Powder
56Low qualityCountry not stated5.8¢per 500 mg
132% more
- Pack
- $28.972,000 servings
- Calcium per serving
- 125 mg
- Pack lasts
- 500 daysif you take 500 mg a day
bulksupplements.com (opens in a new tab)Checked Nov 1, 2026 · Label
- Rank 11
Swanson Vitamins
Calcium Carbonate, Aspartate & Citrate, 500 mg
Citrate · Tablets
80Good qualityCountry not stated6.4¢per 500 mg
156% more
- Pack
- $6.39100 tablets
- Calcium per serving
- 500 mgin 1 tablet
- Pack lasts
- 100 daysif you take 1 tablet (500 mg) a day
vitacost.com (opens in a new tab)Checked Nov 1, 2026 · Label
- Rank 12
Swanson Vitamins
Calcium Carbonate Aspartate & Citrate
Citrate · Tablets
80Good qualityCountry not stated6.4¢per 500 mg
156% more
- Pack
- $6.39100 tablets
- Calcium per serving
- 500 mgin 1 tablet
- Pack lasts
- 100 daysif you take 1 tablet (500 mg) a day
swansonvitamins.com (opens in a new tab)Checked Nov 1, 2026 · Label
- Rank 13
Swanson Vitamins
Calcium, Vanilla Cream
Carbonate · Tablets
80Good qualityCountry not stated6.7¢per 500 mg
169% more
- Pack
- $6.71100 tablets
- Calcium per serving
- 500 mgin 1 tablet
- Pack lasts
- 100 daysif you take 1 tablet (500 mg) a day
vitacost.com (opens in a new tab)Checked Nov 1, 2026 · Label
- Rank 14
Nature's Blend
Oyster Shell Calcium
Not stated on the label · Tablets
56Low qualityCountry not stated9¢per 500 mg
260% more
- Pack
- $8.99100 tablets
- Calcium per serving
- 500 mgin 1 tablet
- Pack lasts
- 100 daysif you take 1 tablet (500 mg) a day
swansonvitamins.com (opens in a new tab)Checked Nov 1, 2026 · Label
- Rank 15
BulkSupplements
Calcium Aspartate Powder
Not stated on the label · Powder
56Low qualityCountry not stated9.5¢per 500 mg
280% more
- Pack
- $37.971,000 servings
- Calcium per serving
- 200 mg
- Pack lasts
- 400 daysif you take 500 mg a day
bulksupplements.com (opens in a new tab)Checked Nov 1, 2026 · Label
- Rank 16
BulkSupplements
Calcium Carbonate Powder
Carbonate · Powder
80Good qualityCountry not stated$0.10per 500 mg
300% more
- Pack
- $19.97200 servings
- Calcium per serving
- 500 mg
- Pack lasts
- 200 daysif you take 500 mg a day
bulksupplements.com (opens in a new tab)Checked Nov 1, 2026 · Label
- Rank 17
KAL
Calcium Oyster Shell, 600 mg
Carbonate · Tablets
80Good qualityCountry not stated$0.10per 500 mg
309% more
- Pack
- $12.27100 tablets
- Calcium per serving
- 600 mgin 1 tablet
- Pack lasts
- 100 daysif you take 1 tablet (600 mg) a day
vitacost.com (opens in a new tab)Checked Nov 1, 2026 · Label
- Rank 18
BulkSupplements
Calcium Carbonate Capsules
Carbonate · Capsules
80Good qualityCountry not stated$0.11per 500 mg
322% more
- Pack
- $18.97360 capsules180 servings
- Calcium per serving
- 500 mgin 2 capsules
- Pack lasts
- 180 daysif you take 2 capsules (500 mg) a day
bulksupplements.com (opens in a new tab)Checked Nov 1, 2026 · Label
- Rank 19
Nutricost
Calcium Citrate Powder, Unflavored
Citrate · Powder
85Good qualityCountry not stated$0.11per 500 mg
331% more
- Pack
- $19.97499 g (1.1 lb)143 servings
- Calcium per serving
- 650 mgin 3.5 g
- Pack lasts
- 185 daysif you take 500 mg a day
nutricost.com (opens in a new tab)Checked Nov 1, 2026 · Label
- Rank 20
Swanson Vitamins
100% Pure Calcium Citrate Powder - Dairy Free & Unflavored
Citrate · Powder
80Good qualityCountry not stated$0.11per 500 mg
337% more
- Pack
- $10.39227 g (8 oz)136 servings
- Calcium per serving
- 350 mgin 1.67 g
- Pack lasts
- 95 daysif you take 500 mg a day
swansonvitamins.com (opens in a new tab)Checked Nov 1, 2026 · Label
- Rank 21
Solgar
Chewable Calcium
Carbonate · Tablets
80Good qualityCountry not stated$0.11per 500 mg
348% more
- Pack
- $13.42120 tablets60 servings
- Calcium per serving
- 1,000 mgin 2 tablets
- Pack lasts
- 120 daysif you take 1 tablet (500 mg) a day
vitacost.com (opens in a new tab)Checked Nov 1, 2026 · Label
- Rank 22
Carlson
Liquid Filled Cal-600, 600 mg
Carbonate · Softgels
80Good qualityCountry not stated$0.13per 500 mg
433% more
- Pack
- $39.95250 softgels
- Calcium per serving
- 600 mgin 1 softgel
- Pack lasts
- 250 daysif you take 1 softgel (600 mg) a day
vitacost.com (opens in a new tab)Checked Nov 1, 2026 · Label
- Rank 23
NOW Foods
Calcium Citrate, Pure Powder
Citrate · Powder
80Good qualityPacked in USA$0.13per 500 mg
440% more
- Pack
- $12.24227 g (8 oz)76 servings
- Calcium per serving
- 600 mgin 3 g
- Pack lasts
- 90 daysif you take 500 mg a day
vitacost.com (opens in a new tab)Checked Nov 1, 2026 · Label
- Rank 24
Nutricost
Calcium Citrate, Unflavored
Citrate · Powder
85Good qualityCountry not stated$0.14per 500 mg
441% more
- Pack
- $12.55250 g (8.8 oz)71 servings
- Calcium per serving
- 650 mgin 3.5 g
- Pack lasts
- 92 daysif you take 500 mg a day
vitacost.com (opens in a new tab)Checked Nov 1, 2026 · Label
- Rank 25
BulkSupplements
Calcium Aspartate Powder
Not stated on the label · Powder
56Low qualityCountry not stated$0.14per 500 mg
455% more
- Pack
- $172.974.99 kg (11 lb)4,989 servings
- Calcium per serving
- 125 mgin 1 g
- Pack lasts
- 1,247 daysif you take 500 mg a day
bulksupplements.com (opens in a new tab)Checked Nov 1, 2026 · Label
- Rank 26
Nutricost
Calcium Citrate Powder, Unflavored
Citrate · Powder
80Good qualityMade in USA$0.14per 500 mg
459% more
- Pack
- $13.97250 g (8.8 oz)77 servings
- Calcium per serving
- 650 mgin 3.25 g
- Pack lasts
- 100 daysif you take 500 mg a day
nutricost.com (opens in a new tab)Checked Nov 1, 2026 · Label
- Rank 27
BulkSupplements
Calcium Aspartate Powder
Not stated on the label · Powder
56Low qualityCountry not stated$0.15per 500 mg
500% more
- Pack
- $29.97500 servings
- Calcium per serving
- 200 mg
- Pack lasts
- 200 daysif you take 500 mg a day
bulksupplements.com (opens in a new tab)Checked Nov 1, 2026 · Label
- Rank 28
Carlson
Cal-600
Carbonate · Softgels
80Good qualityCountry not stated$0.16per 500 mg
527% more
- Pack
- $47.00250 softgels
- Calcium per serving
- 600 mgin 1 softgel
- Pack lasts
- 250 daysif you take 1 softgel (600 mg) a day
carlsonlabs.com (opens in a new tab)Checked Nov 1, 2026 · Label
- Rank 29
Nutricost
Calcium Citrate Tablets
Citrate · Tablets
80Good qualityCountry not stated$0.16per 500 mg
533% more
- Pack
- $18.97180 tablets60 servings
- Calcium per serving
- 1,000 mgin 3 tablets
- Pack lasts
- 90 daysif you take 2 tablets (666.67 mg) a day
nutricost.com (opens in a new tab)Checked Nov 1, 2026 · Label
- Rank 30
KAL
Calcium Citrate 1000
Citrate · Tablets
80Good qualityCountry not stated$0.16per 500 mg
535% more
- Pack
- $19.04180 tablets60 servings
- Calcium per serving
- 1,000 mgin 3 tablets
- Pack lasts
- 90 daysif you take 2 tablets (666.67 mg) a day
vitacost.com (opens in a new tab)Checked Nov 1, 2026 · Label
- Rank 31
Natural Factors
Calcium Citrate, 350 mg
Citrate · Tablets
80Good qualityMade in Canada$0.16per 500 mg
539% more
- Pack
- $10.0690 tablets
- Calcium per serving
- 350 mgin 1 tablet
- Pack lasts
- 45 daysif you take 2 tablets (700 mg) a day
vitacost.com (opens in a new tab)Checked Nov 1, 2026 · Label
- Rank 32
Swanson Vitamins
Calcium Citrate Complex, 250 mg
Citrate · Capsules
80Good qualityCountry not stated$0.16per 500 mg
546% more
- Pack
- $24.19300 capsules
- Calcium per serving
- 250 mgin 1 capsule
- Pack lasts
- 150 daysif you take 2 capsules (500 mg) a day
vitacost.com (opens in a new tab)Checked Nov 1, 2026 · Label
- Rank 33
Swanson Vitamins
Calcium Citrate Complex
Citrate · Capsules
80Good qualityCountry not stated$0.16per 500 mg
546% more
- Pack
- $24.19300 capsules
- Calcium per serving
- 250 mgin 1 capsule
- Pack lasts
- 150 daysif you take 2 capsules (500 mg) a day
swansonvitamins.com (opens in a new tab)Checked Nov 1, 2026 · Label
- Rank 34
BulkSupplements
Calcium Gluconate Powder
Other · Powder
80Good qualityCountry not stated$0.16per 500 mg
554% more
- Pack
- $29.971,667 servings
- Calcium per serving
- 55 mg
- Pack lasts
- 183 daysif you take 500 mg a day
bulksupplements.com (opens in a new tab)Checked Nov 1, 2026 · Label
- Rank 35
Solaray
Calcium Citrate
Citrate · Capsules
80Good qualityCountry not stated$0.18per 500 mg
620% more
- Pack
- $21.59240 capsules60 servings
- Calcium per serving
- 1,000 mgin 4 capsules
- Pack lasts
- 120 daysif you take 2 capsules (500 mg) a day
vitacost.com (opens in a new tab)Checked Nov 1, 2026 · Label
- Rank 36
Source Naturals
Calcium, 200 mg
Not stated on the label · Tablets
56Low qualityCountry not stated$0.19per 500 mg
661% more
- Pack
- $19.01250 tablets
- Calcium per serving
- 200 mgin 1 tablet
- Pack lasts
- 83 daysif you take 3 tablets (600 mg) a day
vitacost.com (opens in a new tab)Checked Nov 1, 2026 · Label
- Rank 37
Carlson
Liquid Filled Cal-600, 600 mg
Carbonate · Softgels
30Low qualityCountry not stated$0.19per 500 mg
663% more
- Pack
- $22.87100 softgels
- Calcium per serving
- 600 mgin 1 softgel
- Pack lasts
- 100 daysif you take 1 softgel (600 mg) a day
vitacost.com (opens in a new tab)Checked Nov 1, 2026 · Label
- Rank 38
Nature's Way
Calcium Citrate
Citrate · Capsules
80Good qualityPacked in USA$0.20per 500 mg
684% more
- Pack
- $24.49250 capsules125 servings
- Calcium per serving
- 500 mgin 2 capsules
- Pack lasts
- 125 daysif you take 2 capsules (500 mg) a day
vitacost.com (opens in a new tab)Checked Nov 1, 2026 · Label
- Rank 39
KAL
Calcium Citrate 1000
Citrate · Tablets
80Good qualityCountry not stated$0.20per 500 mg
697% more
- Pack
- $11.9490 tablets30 servings
- Calcium per serving
- 1,000 mgin 3 tablets
- Pack lasts
- 45 daysif you take 2 tablets (666.67 mg) a day
vitacost.com (opens in a new tab)Checked Nov 1, 2026 · Label
- Rank 40
Nutricost
Calcium Citrate, Unflavored
Citrate · Powder
85Good qualityPacked in USA$0.21per 500 mg
741% more
- Pack
- $39.00500 g (1.1 lb)143 servings
- Calcium per serving
- 650 mgin 3.5 g
- Pack lasts
- 185 daysif you take 500 mg a day
vitacost.com (opens in a new tab)Checked Nov 1, 2026 · Label
Good to know
- Fact
- 5,469%more per 500 mg for the most expensive product than for the cheapest.
- Fact
- 5,090%more per 500 mg for the cheapest algae than for the cheapest carbonate.
How we checked: one-time price for each size in the store’s US online shop, before sales tax and shipping, without subscriptions or coupons. Prices change often, so check the store before you buy. More on how we check
The amount we compare by only makes products comparable – it is not a dosage recommendation. Not medical advice.
How we calculate
Cost per dose = price ÷ (servings × amount per serving) × comparison amount. Example: $119.99 for 74 servings with 24 g of protein each is 1,776 g of protein. $119.99 ÷ 1,776 g × 30 g = $2.03 per 30 g of protein.
Found a mistake or a product we should add? Email us