What is calculated
Entered food plus supplemental magnesium.
Magnesium Intake Calculator
Entered magnesium intake
Enter your values, then calculate to see a verified result.
Reference range
How this result is calculated
A clear calculation path based on your inputs.
Inputs usedReview the information used for this result.
Full calculation and sourcesOpen Full calculation and sources to review the formula, assumptions, boundaries, and evidence.
Versioned calculationFormula v1.0.0
Method
Add the totals but compare only supplemental magnesium with the cited supplemental UL.
Important boundary
Intake does not determine serum or tissue status.
Separate sourcesUse the labeled input and matching unit.
Measured or label valueChoose the referenceThe calculator applies the stated equation.
Full precision firstAudit supplements separatelyKeep the boundary beside the result.
Reference, not diagnosisInterpretation
mg/day is the entered total.
RDA and supplemental-UL comparisons remain distinct.
The tool does not recommend a supplement dose.
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Related calculators and resources
Method and test recordFormula v1.0.0
- Recorded scope
- health-wellness-completion
- Publisher
- CalculatorGeek
- Recorded review date
- 2026-10-05
- Next source review
- 2027-04-05
- Definition fixtures
- 2 configured scenarios
- Published examples
- 2 shown below
Recorded method
Verify reference-group selection and separate total-versus-supplement comparisons.
These records describe the published model and reference tests. A test-case count is not a certification of every possible input or an independent specialist review. Editorial policy
Known limitations
- Not for pediatric, pregnancy, lactation, or disease-specific dosing.
- Does not estimate absorption or blood status.
- Supplement labels may list compound mass differently from elemental magnesium; use elemental magnesium.
Method sources
Latest model update
2026-10-05 - Initial evidence-limited shared-system implementation with fixtures, original support content, and contextual links.
Reference inputs and expected results
Up to 12 examples from the configured definition fixtures are shown. Expected values use the stated output units; invalid inputs are intended to be rejected.
| Case | Inputs | Expected result |
|---|---|---|
| female 31 reference | Magnesium from food: 250 mg; Magnesium from supplements and medicines: 100 mg; Adult RDA reference: female_31 | Entered magnesium intake: 350 mg/day; Selected RDA reference: 320 mg/day; Share of selected NIH RDA: 109.375 %; Share of 350 mg supplemental UL: 28.5714286 % (allowed numeric tolerance: 0.001) |
| male 31 reference | Magnesium from food: 300 mg; Magnesium from supplements and medicines: 120 mg; Adult RDA reference: male_31 | Entered magnesium intake: 420 mg/day; Share of selected NIH RDA: 100 % (allowed numeric tolerance: 0.0001) |
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On this page
What the Magnesium Intake Calculator calculates
Add food and supplemental magnesium while preserving the NIH rule that the adult upper limit applies only to supplements and medicines.
The calculator prevents the common error of applying the supplemental UL to naturally occurring food magnesium.
Use the Health calculators hub to choose the neighboring workflow rather than stretching this result beyond its defined job.
How to use the Magnesium Intake Calculator
- Enter food magnesium.
- Enter supplements and magnesium-containing medicines separately.
- Choose the adult RDA reference group.
- Review the supplemental comparison separately from total intake.
Continue with the Supplement Stack Calculator. Find duplicate amounts of one ingredient.
Formula, variables and calculation order
total = food + supplement; RDA comparison uses total, while supplement / 350 mg uses only supplemental sources.
Inputs are validated and normalized before calculation. Full precision is retained until the displayed result is rounded.
Cross-check a different part of the decision with the Vitamin D Intake Calculator. Audit another micronutrient separately.
Worked example and boundary check
Worked example
250 mg from food plus 100 mg from supplements equals 350 mg total; the supplement amount is 28.6% of the supplemental UL.
Boundary check
The 350 mg limit does not include magnesium naturally present in food.
How to interpret the result
Use the result to reconcile labels, not to diagnose deficiency or kidney-related safety.
- Not for pediatric, pregnancy, lactation, or disease-specific dosing.
- Does not estimate absorption or blood status.
- Supplement labels may list compound mass differently from elemental magnesium; use elemental magnesium.
For a separate result with different assumptions, open the Water Intake Calculator. Keep fluid planning separate.
Frequently asked questions
Does the 350 mg UL include food?
No. NIH applies it to supplements and medications for adults.
Should I enter magnesium citrate compound mass?
Enter elemental magnesium from the Supplement Facts label.
Does meeting the RDA prove adequate status?
No.
What if I have kidney disease?
Use individualized professional guidance.
Primary sources and evidence limits
Sources were checked 2026-10-05. A reference value, conversion, or schedule estimate is not a diagnosis, prescription, individualized treatment target, or substitute for professional care.