Worked example
$21.59 · 270 mg · 120 servings
$21.59 ÷ (270 × 120 ÷ 100) = $0.0666 per 100 mg. The container declares 32.4 total elemental grams.
Ungated tool
Elemental cost calculator
For 100 mg elemental magnesium, oxide requires 166 mg of compound and glycinate 709–845 mg, using the chemistry accompanying the 2026-08-10 snapshot. The tables calculate 3 elemental amounts across all 15 salts; the calculator below converts price, elemental mg per serving and serving count into cost per 100 mg.
Compound arithmetic
How much compound carries 100, 200 or 400 mg elemental magnesium?
For the 15 salts in the chemistry table accompanying the 2026-08-10 snapshot, compound mass equals elemental mass divided by the magnesium fraction. The 100, 200 and 400 mg columns are arithmetic scenarios; each range preserves the salt's hydration or composition ambiguity.
| Salt | Mg fraction | Compound mg for 100 mg elemental | Compound mg for 200 mg elemental | Compound mg for 400 mg elemental | Standalone calculation |
|---|---|---|---|---|---|
| Magnesium oxide | 60.32% | 166 mg | 332 mg | 663 mg | At 60.32% magnesium by mass, magnesium oxide requires 166, 332 and 663 mg of compound for 100, 200 and 400 mg elemental magnesium respectively, using the chemistry accompanying the 2026-08-10 snapshot. The modeled formula is MgO. |
| Magnesium hydroxide | 41.68% | 240 mg | 480 mg | 960 mg | At 41.68% magnesium by mass, magnesium hydroxide requires 240, 480 and 960 mg of compound for 100, 200 and 400 mg elemental magnesium respectively, using the chemistry accompanying the 2026-08-10 snapshot. The modeled formula is Mg(OH)₂. |
| Magnesium carbonate | 24.78–28.83% | 347–404 mg | 694–807 mg | 1,387–1,614 mg | At 24.78–28.83% magnesium by mass, magnesium carbonate requires 347–404, 694–807 and 1,387–1,614 mg of compound for 100, 200 and 400 mg elemental magnesium respectively, using the chemistry accompanying the 2026-08-10 snapshot. The interval reflects anhydrous or hydrated; labels rarely state which. |
| Magnesium chloride | 11.96–25.53% | 392–836 mg | 783–1,672 mg | 1,567–3,344 mg | At 11.96–25.53% magnesium by mass, magnesium chloride requires 392–836, 783–1,672 and 1,567–3,344 mg of compound for 100, 200 and 400 mg elemental magnesium respectively, using the chemistry accompanying the 2026-08-10 snapshot. The interval reflects anhydrous 25.5%, hexahydrate 12.0%. |
| Magnesium sulfate | 9.86–20.19% | 495–1,014 mg | 991–2,028 mg | 1,981–4,057 mg | At 9.86–20.19% magnesium by mass, magnesium sulfate requires 495–1,014, 991–2,028 and 1,981–4,057 mg of compound for 100, 200 and 400 mg elemental magnesium respectively, using the chemistry accompanying the 2026-08-10 snapshot. The interval reflects anhydrous 20.2%, heptahydrate 9.9%. |
| Magnesium citrate | 11.30–16.16% | 619–885 mg | 1,238–1,770 mg | 2,475–3,540 mg | At 11.30–16.16% magnesium by mass, magnesium citrate requires 619–885, 1,238–1,770 and 2,475–3,540 mg of compound for 100, 200 and 400 mg elemental magnesium respectively, using the chemistry accompanying the 2026-08-10 snapshot. The interval reflects trimagnesium dicitrate 16.2%; dibasic and hydrated forms as low as 11.3%. |
| Magnesium malate | 13.20–15.54% | 644–758 mg | 1,287–1,515 mg | 2,574–3,030 mg | At 13.20–15.54% magnesium by mass, magnesium malate requires 644–758, 1,287–1,515 and 2,574–3,030 mg of compound for 100, 200 and 400 mg elemental magnesium respectively, using the chemistry accompanying the 2026-08-10 snapshot. The interval reflects anhydrous or dihydrate. |
| Magnesium glycinate | 11.83–14.10% | 709–845 mg | 1,418–1,691 mg | 2,837–3,381 mg | At 11.83–14.10% magnesium by mass, magnesium glycinate requires 709–845, 1,418–1,691 and 2,837–3,381 mg of compound for 100, 200 and 400 mg elemental magnesium respectively, using the chemistry accompanying the 2026-08-10 snapshot. The interval reflects bisglycinate; chelate hydration varies by supplier. |
| Magnesium glycerophosphate | 12.50% | 800 mg | 1,600 mg | 3,200 mg | At 12.50% magnesium by mass, magnesium glycerophosphate requires 800, 1,600 and 3,200 mg of compound for 100, 200 and 400 mg elemental magnesium respectively, using the chemistry accompanying the 2026-08-10 snapshot. The modeled formula is MgC₃H₇O₆P. |
| Magnesium lactate | 12.01% | 833 mg | 1,665 mg | 3,331 mg | At 12.01% magnesium by mass, magnesium lactate requires 833, 1,665 and 3,331 mg of compound for 100, 200 and 400 mg elemental magnesium respectively, using the chemistry accompanying the 2026-08-10 snapshot. The modeled formula is Mg(C₃H₅O₃)₂. |
| Magnesium taurate | 8.85% | 1,130 mg | 2,260 mg | 4,520 mg | At 8.85% magnesium by mass, magnesium taurate requires 1,130, 2,260 and 4,520 mg of compound for 100, 200 and 400 mg elemental magnesium respectively, using the chemistry accompanying the 2026-08-10 snapshot. The modeled formula is Mg(C₂H₆NO₃S)₂. |
| Magnesium aspartate | 8.42% | 1,188 mg | 2,375 mg | 4,751 mg | At 8.42% magnesium by mass, magnesium aspartate requires 1,188, 2,375 and 4,751 mg of compound for 100, 200 and 400 mg elemental magnesium respectively, using the chemistry accompanying the 2026-08-10 snapshot. The modeled formula is Mg(C₄H₆NO₄)₂. |
| Magnesium L-threonate | 8.25% | 1,212 mg | 2,424 mg | 4,848 mg | At 8.25% magnesium by mass, magnesium l-threonate requires 1,212, 2,424 and 4,848 mg of compound for 100, 200 and 400 mg elemental magnesium respectively, using the chemistry accompanying the 2026-08-10 snapshot. The modeled formula is Mg(C₄H₇O₅)₂. |
| Magnesium orotate | 7.27% | 1,376 mg | 2,751 mg | 5,502 mg | At 7.27% magnesium by mass, magnesium orotate requires 1,376, 2,751 and 5,502 mg of compound for 100, 200 and 400 mg elemental magnesium respectively, using the chemistry accompanying the 2026-08-10 snapshot. The modeled formula is Mg(C₅H₃N₂O₄)₂. |
| Magnesium gluconate | 5.86% | 1,706 mg | 3,413 mg | 6,826 mg | At 5.86% magnesium by mass, magnesium gluconate requires 1,706, 3,413 and 6,826 mg of compound for 100, 200 and 400 mg elemental magnesium respectively, using the chemistry accompanying the 2026-08-10 snapshot. The modeled formula is Mg(C₆H₁₁O₇)₂. |
Masses are rounded to whole milligrams for display. Calculations retain the unrounded fractions from the chemistry layer. For a range, dividing by the highest magnesium fraction gives the smallest compound mass; dividing by the lowest fraction gives the largest mass. Doubling the elemental amount doubles both ends of that mass interval.
Packing arithmetic
How many size 0, 00 or 000 capsules hold that compound?
Using modeled capacities of 545, 730 and 1100 mg for sizes 0, 00 and 000 at powder density 0.6–0.8 g/mL, the chemistry accompanying the 2026-08-10 snapshot yields the minimum whole-capsule counts below for 100, 200 and 400 mg elemental magnesium.
Each cell lists counts in the order 100 mg / 200 mg / 400 mg elemental. Count = compound mg ÷ capsule capacity, rounded upward separately at both ends of the mass interval. A single count for a hydrated salt means both ends round to that same whole number.
| Salt | Size 0 · 545 mg | Size 00 · 730 mg | Size 000 · 1100 mg | Standalone packing calculation |
|---|---|---|---|---|
| Magnesium oxide | 1 / 1 / 2 | 1 / 1 / 1 | 1 / 1 / 1 | For 100 / 200 / 400 mg elemental magnesium as magnesium oxide, the minimum modeled counts are 1 / 1 / 2 size 0 capsules (545 mg capacity); 1 / 1 / 1 size 00 capsules (730 mg capacity); 1 / 1 / 1 size 000 capsules (1100 mg capacity), using the chemistry accompanying the 2026-08-10 snapshot. |
| Magnesium hydroxide | 1 / 1 / 2 | 1 / 1 / 2 | 1 / 1 / 1 | For 100 / 200 / 400 mg elemental magnesium as magnesium hydroxide, the minimum modeled counts are 1 / 1 / 2 size 0 capsules (545 mg capacity); 1 / 1 / 2 size 00 capsules (730 mg capacity); 1 / 1 / 1 size 000 capsules (1100 mg capacity), using the chemistry accompanying the 2026-08-10 snapshot. |
| Magnesium carbonate | 1 / 2 / 3 | 1 / 1–2 / 2–3 | 1 / 1 / 2 | For 100 / 200 / 400 mg elemental magnesium as magnesium carbonate, the minimum modeled counts are 1 / 2 / 3 size 0 capsules (545 mg capacity); 1 / 1–2 / 2–3 size 00 capsules (730 mg capacity); 1 / 1 / 2 size 000 capsules (1100 mg capacity), using the chemistry accompanying the 2026-08-10 snapshot. |
| Magnesium chloride | 1–2 / 2–4 / 3–7 | 1–2 / 2–3 / 3–5 | 1 / 1–2 / 2–4 | For 100 / 200 / 400 mg elemental magnesium as magnesium chloride, the minimum modeled counts are 1–2 / 2–4 / 3–7 size 0 capsules (545 mg capacity); 1–2 / 2–3 / 3–5 size 00 capsules (730 mg capacity); 1 / 1–2 / 2–4 size 000 capsules (1100 mg capacity), using the chemistry accompanying the 2026-08-10 snapshot. |
| Magnesium sulfate | 1–2 / 2–4 / 4–8 | 1–2 / 2–3 / 3–6 | 1 / 1–2 / 2–4 | For 100 / 200 / 400 mg elemental magnesium as magnesium sulfate, the minimum modeled counts are 1–2 / 2–4 / 4–8 size 0 capsules (545 mg capacity); 1–2 / 2–3 / 3–6 size 00 capsules (730 mg capacity); 1 / 1–2 / 2–4 size 000 capsules (1100 mg capacity), using the chemistry accompanying the 2026-08-10 snapshot. |
| Magnesium citrate | 2 / 3–4 / 5–7 | 1–2 / 2–3 / 4–5 | 1 / 2 / 3–4 | For 100 / 200 / 400 mg elemental magnesium as magnesium citrate, the minimum modeled counts are 2 / 3–4 / 5–7 size 0 capsules (545 mg capacity); 1–2 / 2–3 / 4–5 size 00 capsules (730 mg capacity); 1 / 2 / 3–4 size 000 capsules (1100 mg capacity), using the chemistry accompanying the 2026-08-10 snapshot. |
| Magnesium malate | 2 / 3 / 5–6 | 1–2 / 2–3 / 4–5 | 1 / 2 / 3 | For 100 / 200 / 400 mg elemental magnesium as magnesium malate, the minimum modeled counts are 2 / 3 / 5–6 size 0 capsules (545 mg capacity); 1–2 / 2–3 / 4–5 size 00 capsules (730 mg capacity); 1 / 2 / 3 size 000 capsules (1100 mg capacity), using the chemistry accompanying the 2026-08-10 snapshot. |
| Magnesium glycinate | 2 / 3–4 / 6–7 | 1–2 / 2–3 / 4–5 | 1 / 2 / 3–4 | For 100 / 200 / 400 mg elemental magnesium as magnesium glycinate, the minimum modeled counts are 2 / 3–4 / 6–7 size 0 capsules (545 mg capacity); 1–2 / 2–3 / 4–5 size 00 capsules (730 mg capacity); 1 / 2 / 3–4 size 000 capsules (1100 mg capacity), using the chemistry accompanying the 2026-08-10 snapshot. |
| Magnesium glycerophosphate | 2 / 3 / 6 | 2 / 3 / 5 | 1 / 2 / 3 | For 100 / 200 / 400 mg elemental magnesium as magnesium glycerophosphate, the minimum modeled counts are 2 / 3 / 6 size 0 capsules (545 mg capacity); 2 / 3 / 5 size 00 capsules (730 mg capacity); 1 / 2 / 3 size 000 capsules (1100 mg capacity), using the chemistry accompanying the 2026-08-10 snapshot. |
| Magnesium lactate | 2 / 4 / 7 | 2 / 3 / 5 | 1 / 2 / 4 | For 100 / 200 / 400 mg elemental magnesium as magnesium lactate, the minimum modeled counts are 2 / 4 / 7 size 0 capsules (545 mg capacity); 2 / 3 / 5 size 00 capsules (730 mg capacity); 1 / 2 / 4 size 000 capsules (1100 mg capacity), using the chemistry accompanying the 2026-08-10 snapshot. |
| Magnesium taurate | 3 / 5 / 9 | 2 / 4 / 7 | 2 / 3 / 5 | For 100 / 200 / 400 mg elemental magnesium as magnesium taurate, the minimum modeled counts are 3 / 5 / 9 size 0 capsules (545 mg capacity); 2 / 4 / 7 size 00 capsules (730 mg capacity); 2 / 3 / 5 size 000 capsules (1100 mg capacity), using the chemistry accompanying the 2026-08-10 snapshot. |
| Magnesium aspartate | 3 / 5 / 9 | 2 / 4 / 7 | 2 / 3 / 5 | For 100 / 200 / 400 mg elemental magnesium as magnesium aspartate, the minimum modeled counts are 3 / 5 / 9 size 0 capsules (545 mg capacity); 2 / 4 / 7 size 00 capsules (730 mg capacity); 2 / 3 / 5 size 000 capsules (1100 mg capacity), using the chemistry accompanying the 2026-08-10 snapshot. |
| Magnesium L-threonate | 3 / 5 / 9 | 2 / 4 / 7 | 2 / 3 / 5 | For 100 / 200 / 400 mg elemental magnesium as magnesium l-threonate, the minimum modeled counts are 3 / 5 / 9 size 0 capsules (545 mg capacity); 2 / 4 / 7 size 00 capsules (730 mg capacity); 2 / 3 / 5 size 000 capsules (1100 mg capacity), using the chemistry accompanying the 2026-08-10 snapshot. |
| Magnesium orotate | 3 / 6 / 11 | 2 / 4 / 8 | 2 / 3 / 6 | For 100 / 200 / 400 mg elemental magnesium as magnesium orotate, the minimum modeled counts are 3 / 6 / 11 size 0 capsules (545 mg capacity); 2 / 4 / 8 size 00 capsules (730 mg capacity); 2 / 3 / 6 size 000 capsules (1100 mg capacity), using the chemistry accompanying the 2026-08-10 snapshot. |
| Magnesium gluconate | 4 / 7 / 13 | 3 / 5 / 10 | 2 / 4 / 7 | For 100 / 200 / 400 mg elemental magnesium as magnesium gluconate, the minimum modeled counts are 4 / 7 / 13 size 0 capsules (545 mg capacity); 3 / 5 / 10 size 00 capsules (730 mg capacity); 2 / 4 / 7 size 000 capsules (1100 mg capacity), using the chemistry accompanying the 2026-08-10 snapshot. |
This model allocates each capsule's fill to the magnesium compound. Excipients and other active ingredients occupy additional space; powder density and actual capsule dimensions affect the physical fill. The label audit applies the same capacities to declared serving-unit counts, with each product's mass interval shown on its record.
Enter container details
EC100
0.0% equal to the verified Magnesium glycinate median of $0.0666.
Assumptions
One-time item price
No coupon or subscription price is used, and shipping is excluded. The result is arithmetic on declared and observed fields only.
The metric
What EC100 measures
EC100 = container price ÷ (elemental mg per serving × servings per container ÷ 100)
It normalizes the declared elemental amount to a 100 mg unit. It does not score ingredients, quality, or outcomes.