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Check copper intake vs RDA — see mcg/day, % of RDA and food sources.
Check copper intake vs RDA — see mcg/day, % of RDA and food sources.
Enter values above and click Calculate — results will appear here with the formula explained.
Copper RDA is 900 mcg daily for adults 19+ (1,000 mcg pregnancy, 1,300 mcg lactation) — a trace amount with outsized roles in iron metabolism, connective tissue, energy production and neurotransmitter synthesis. This calculator checks estimated intake as percent of RDA; typical Western diets deliver 1,000–1,600 mcg, so adequacy is the default, not the achievement.
Food hierarchy is steep: beef liver (~12,000 mcg per 3 oz, 13× RDA) and oysters (~4,800 mcg) tower over cashews (~600 mcg/oz), sunflower seeds, dark chocolate and lentils. One weekly serving of shellfish or liver covers the RDA several times over; plant-only diets still suffice via nuts, seeds, legumes and whole grains, though phytates modestly reduce absorption.
Copper's jobs explain why deficiency mimics other diseases: ceruloplasmin ferroxidase activity (iron mobilization — copper deficiency causes anemia unresponsive to iron), lysyl oxidase crosslinking (vessel and bone strength), cytochrome-c oxidase (cellular energy), and dopamine-beta-hydroxylase (neurotransmitters). Deficiency presents as anemia plus neutropenia plus neurologic signs — a triad pointing at copper, B12 or both.
The zinc interaction is the practical trap: zinc above ~50 mg/day induces intestinal metallothionein, which binds copper preferentially and blocks its absorption — the commonest acquired copper deficiency route (denture cream zinc, high-dose cold remedies). Anyone supplementing zinc long-term should pair copper (~2 mg) or eat copper-rich foods; the ideal dietary Zn:Cu ratio sits near 8–15:1.
Toxicity comes from supplements, contaminated water (acidic water through copper pipes) or genetic Wilson disease (ATP7B failure → hepatic copper overload), not food. Acute excess causes nausea and vomiting; chronic overload damages liver and basal ganglia. The 10,000 mcg UL has wide margin — food alone essentially never reaches it.
Deficiency contexts: malabsorption (celiac, bariatric surgery), excessive zinc, Menkes disease (infants, ATP7A defect) and parenteral nutrition without copper. This is general information — persistent anemia with neutropenia warrants copper, B12, iron studies and clinical workup, not calculator reassurance.
Check copper intake vs RDA — see mcg/day, % of RDA and food sources. Formula: RDA: 900 mcg 19+. Example: With 1200 mcg daily intake: 133% of the 900 mcg RDA — adequate.
Copper RDA is 900 mcg daily for adults 19+ (1,000 mcg pregnancy, 1,300 mcg lactation) — a trace amount with outsized roles in iron metabolism, connective tissue, energy production and neurotransmitter synthesis. This calculator checks estimated intake as percent of RDA; typical Western diets deliver 1,000–1,600 mcg, so adequacy is the default, not the achievement.
Food hierarchy is steep: beef liver (~12,000 mcg per 3 oz, 13× RDA) and oysters (~4,800 mcg) tower over cashews (~600 mcg/oz), sunflower seeds, dark chocolate and lentils. One weekly serving of shellfish or liver covers the RDA several times over; plant-only diets still suffice via nuts, seeds, legumes and whole grains, though phytates modestly reduce absorption.
Copper's jobs explain why deficiency mimics other diseases: ceruloplasmin ferroxidase activity (iron mobilization — copper deficiency causes anemia unresponsive to iron), lysyl oxidase crosslinking (vessel and bone strength), cytochrome-c oxidase (cellular energy), and dopamine-beta-hydroxylase (neurotransmitters). Deficiency presents as anemia plus neutropenia plus neurologic signs — a triad pointing at copper, B12 or both.
The zinc interaction is the practical trap: zinc above ~50 mg/day induces intestinal metallothionein, which binds copper preferentially and blocks its absorption — the commonest acquired copper deficiency route (denture cream zinc, high-dose cold remedies). Anyone supplementing zinc long-term should pair copper (~2 mg) or eat copper-rich foods; the ideal dietary Zn:Cu ratio sits near 8–15:1.
Toxicity comes from supplements, contaminated water (acidic water through copper pipes) or genetic Wilson disease (ATP7B failure → hepatic copper overload), not food. Acute excess causes nausea and vomiting; chronic overload damages liver and basal ganglia. The 10,000 mcg UL has wide margin — food alone essentially never reaches it.
Deficiency contexts: malabsorption (celiac, bariatric surgery), excessive zinc, Menkes disease (infants, ATP7A defect) and parenteral nutrition without copper. This is general information — persistent anemia with neutropenia warrants copper, B12, iron studies and clinical workup, not calculator reassurance.
With 1200 mcg daily intake: 133% of the 900 mcg RDA — adequate. A 3-oz serving of beef liver provides ~12,000 mcg (13× RDA), while 1 oz cashews provides ~600 mcg. Shellfish are the richest source: 3 oz oysters deliver ~4,800 mcg (5× RDA).
Last reviewed: September 2026 · Report an error