Most adults need about 1,500 mg of sodium, 2,600 to 3,400 mg of potassium, 310 to 420 mg of magnesium, 1,000 to 1,200 mg of calcium, and 2,300 mg of chloride each day. These are the five major electrolytes your body uses to regulate fluid balance, nerve signaling, and muscle contraction. The exact amounts vary by age, sex, and activity level, but these targets give you a solid framework.
Sodium: 1,500 mg Per Day
The National Academy of Medicine sets the adequate intake for sodium at 1,500 mg per day for adults. That’s roughly two-thirds of a teaspoon of table salt. The World Health Organization is slightly more generous, recommending less than 2,000 mg per day (equivalent to about 5 grams of salt, or just under a full teaspoon).
Most people in Western countries eat well above both of these targets, often 3,000 to 4,000 mg daily, largely from processed and restaurant food. Sodium is one electrolyte where the practical challenge is eating less, not more. Common sources include pickles, cheese, canned soups, bread, and anything with added table salt. If you’re an athlete or heavy sweater losing significant sodium through sweat, your needs may be higher than the baseline recommendation.
Potassium: 2,600 to 3,400 mg Per Day
Potassium needs differ by sex. Adult men (19 and older) should aim for 3,400 mg per day, while adult women need 2,600 mg. Unlike sodium, most people fall short of their potassium target. This mineral works in direct opposition to sodium: it helps relax blood vessel walls, balance fluid levels, and keep blood pressure in a healthy range.
Good food sources include bananas, potatoes, avocado, white beans, salmon, beet greens, milk, and mushrooms. A medium banana has roughly 400 mg, so you can see that hitting 3,400 mg takes a variety of potassium-rich foods spread across the day, not just one piece of fruit. People with kidney disease should not follow the standard recommendations, since their kidneys may not clear potassium efficiently.
Magnesium: 310 to 420 mg Per Day
Magnesium requirements also split by sex and shift slightly with age. Men aged 19 to 30 need 400 mg daily, rising to 420 mg after age 31. Women in the same age brackets need 310 mg and 320 mg, respectively. During pregnancy, the target increases to 350 to 360 mg depending on age.
Magnesium is involved in over 300 enzymatic reactions in your body, including energy production, muscle relaxation, and sleep regulation. Spinach, pumpkin seeds, almonds, lima beans, brown rice, and tuna are all strong sources. Despite being widely available in food, magnesium deficiency is relatively common because modern diets lean heavily on processed grains, which lose most of their magnesium during refining.
Calcium: 1,000 to 1,200 mg Per Day
Adults aged 19 to 50 need 1,000 mg of calcium daily. Women over 50 and all adults over 70 need 1,200 mg, reflecting the increased risk of bone loss in those groups. Men between 51 and 70 can stay at 1,000 mg.
Calcium does more than build bones. It’s essential for muscle contraction, blood clotting, and nerve transmission. Dairy products are the most concentrated sources: a cup of milk provides roughly 300 mg, and yogurt and cheese are similarly rich. Non-dairy options include tofu (especially calcium-set varieties), spinach, okra, and fortified plant milks. If you don’t eat dairy regularly, you’ll need to be intentional about stacking several of these sources throughout the day.
Chloride: 2,300 mg Per Day
The FDA sets chloride’s daily value at 2,300 mg. Chloride almost always travels alongside sodium, since table salt is sodium chloride. If you’re getting enough salt in your diet, you’re almost certainly covered on chloride. It plays a key role in maintaining stomach acid and fluid balance. Deficiency is rare outside of prolonged vomiting, heavy sweating, or certain medications.
How Exercise Changes Your Needs
These baseline numbers assume a typical activity level. If you exercise intensely or work outdoors in heat, you lose electrolytes through sweat, particularly sodium and potassium. A single hour of hard exercise can deplete 500 to 1,500 mg of sodium depending on your sweat rate and the temperature.
For rehydration during or after exercise, Johns Hopkins Medicine recommends aiming for about 300 mg of sodium per 16-ounce serving of a sports drink. A simple homemade option is one liter of water mixed with half a teaspoon of salt, half a cup of orange juice, and two tablespoons of honey. This roughly mimics the electrolyte profile of commercial sports drinks without the artificial ingredients.
For casual exercise lasting under an hour, plain water is usually sufficient. Electrolyte replacement becomes more important when you’re sweating heavily for 60 minutes or longer, exercising in hot or humid conditions, or noticing muscle cramps and fatigue that plain water doesn’t resolve.
Getting Electrolytes From Food vs. Supplements
For most people, a balanced diet covers all five major electrolytes without supplements or specialty drinks. The key is variety. A day that includes some vegetables (spinach, potatoes, avocado), a serving of dairy or fortified alternative, a portion of protein (fish, beans, tofu), and a handful of nuts or seeds will get you close to every target.
Where food falls short, the gap is almost always in potassium and magnesium, the two electrolytes most people undereat. Rather than reaching for a supplement first, try adding one or two servings of leafy greens, a banana, or a handful of pumpkin seeds. These additions can close a significant portion of the gap.
Electrolyte supplements and tablets are useful in specific situations: endurance athletics, illness involving vomiting or diarrhea, or restrictive diets that eliminate major food groups. Outside of those scenarios, food is a more reliable and balanced source because it delivers electrolytes alongside the fiber, vitamins, and other nutrients your body needs to absorb and use them effectively.
Quick Reference by Electrolyte
- Sodium: 1,500 mg (adequate intake). Top sources: salt, pickles, cheese, canned foods.
- Potassium: 2,600 mg (women) to 3,400 mg (men). Top sources: bananas, potatoes, beans, avocado.
- Magnesium: 310 to 420 mg depending on age and sex. Top sources: spinach, pumpkin seeds, almonds, brown rice.
- Calcium: 1,000 to 1,200 mg depending on age and sex. Top sources: milk, yogurt, cheese, tofu, fortified plant milks.
- Chloride: 2,300 mg. Top sources: table salt, pickles, seaweed.