Sodium Intake Calculator
A daily milligram target — adjusted for your health context, climate, and sweat losses.
A sodium intake calculator gives you a daily sodium target in milligrams. AHA recommends 1,500 mg ideal / 2,300 mg ceiling; DASH calls for 1,500 mg for hypertension. Athletes lose 500–1,500 mg of sodium per liter of sweat and may need 3,000–4,000 mg on hard training days.
Now turn the number into action
A calculator gives you a target. A tracker tells you whether you're actually hitting it. These are the three we recommend — Welling first, because it's the only one that goes beyond logging.
Welling
Doesn't just log food — it coaches. Welling pairs effortless calorie and macro tracking with an AI coach that reads your data, flags patterns (under-eating protein, weekend over-shoots, plateau windows), and adjusts your plan. The best fit for anyone who wants the math and the accountability.
MacroFactor
The most accurate auto-adjusting calorie target on the market. MacroFactor recalculates your expenditure weekly from your actual weight trend and food log — so when adaptive thermogenesis kicks in, your target shifts before the scale stalls. Best for serious dieters who want hands-off precision.
MyFitnessPal
The most well-known calorie tracker, with the biggest food database (millions of crowd-sourced entries). Easy to use, free tier covers the basics, and barcode-scanning is fast. Trade-off: entries vary in accuracy — verify generic foods against USDA values when precision matters.
Further reading: round-ups of AI calorie trackers, food trackers, and calorie counters.
How your sodium target is calculated
Two baselines, plus a sweat-loss top-up.
Baseline by context
- General adult: 2,300 mg/day (AHA upper limit) with an ideal of 1,500 mg.
- Hypertension / high BP: 1,500 mg/day (DASH diet recommendation).
- Endurance athlete: 2,300 mg/day baseline plus sweat replacement.
Sweat-loss top-up
Sweat sodium losses vary widely between individuals. Our estimate uses sweat-rate and climate inputs:
Light: 8 mg/min · Moderate: 15 mg/min · Heavy: 25 mg/min
Climate: temperate 1.0 · warm 1.25 · hot 1.5
Worked example
An endurance athlete training 60 min/day, moderate sweat rate, warm climate:
Sweat: 60 × 15 × 1.25 = 1,125 mg
Daily target: ~3,425 mg
That's higher than the AHA general-population ceiling — and appropriate. Sodium needs scale with sweat losses.
Why calculating sodium intake is useful
- It catches over- and under-consumption. The average American eats 3,400 mg/day — too much. The average low-carb dieter or clean eater can drop below 1,200 mg/day — too little. Both create problems.
- It improves endurance performance. Hyponatremia (low blood sodium) is the most common medical issue in marathons. Knowing your sweat-loss budget prevents it.
- It clarifies the "salt in coffee" trend. The current advice to "add salt to your water" works for athletes losing 2,000+ mg/day in sweat. For sedentary people eating processed food, it doesn't.
- It helps manage blood pressure. For salt-sensitive individuals, getting under 1,500 mg/day measurably reduces blood pressure within weeks.
- It reframes electrolyte supplements. Most LMNT-style packets give 1,000+ mg sodium per serving. That's appropriate for athletes; for the average sedentary person, it's a third of the daily ceiling in one drink.
Sodium per serving (common foods)
- Bagel — 460 mg
- Pizza slice — 700 mg
- Cold cuts (2 oz) — 600 mg
- Soy sauce (1 tbsp) — 1,000 mg
- Bread (slice) — 150–230 mg
- Restaurant entrée — 1,200–2,500 mg
- Cheese (1 oz) — 180 mg
- Canned soup (1 cup) — 700–900 mg
FAQ
How much sodium per day is safe?
The American Heart Association recommends an ideal intake of 1,500 mg/day for most adults and a hard ceiling of 2,300 mg/day. Average US intake is ~3,400 mg — significantly above both targets.
Is low-sodium always better?
No. Going below ~1,500 mg/day without medical reason offers no clear benefit and may impair endurance performance, raise heart rate, and worsen sleep. The lowest CV-event risk in some studies sits around 3,000 mg — though that's contested.
Do athletes need more sodium?
Yes. Sweat sodium ranges from ~400 to ~2,000 mg per liter depending on the person. Heavy sweaters in hot conditions can lose 4–6 g of sodium in a single long training session. Replacing it is essential to avoid cramping and hyponatremia.
How do I cut sodium without cooking bland food?
Most sodium comes from packaged foods, breads, and restaurant meals — not the salt shaker. Cook from whole ingredients, salt to taste, and you'll naturally land between 1,500 and 2,300 mg.
What about sodium and blood pressure?
Sodium restriction reduces blood pressure modestly in salt-sensitive individuals (~25–50% of hypertensives). For non-salt-sensitive people, the effect is small. Potassium and overall diet quality matter as much as sodium for BP control.
Sources
- American Heart Association. How much sodium should I eat per day?
- Sacks FM, et al. Effects on blood pressure of reduced dietary sodium and the DASH diet. NEJM. 2001;344:3–10.
- Sawka MN, et al. ACSM Position Stand: Exercise and Fluid Replacement. Med Sci Sports Exerc. 2007;39(2):377–90.