Interpreting Your Electrolyte Needs
Turning ion loss numbers into real products and real doses.
The calculator gives you milligrams; this guide turns milligrams into bottles and tablets.
You know you lost 2000 mg of sodium over a long ride. The question is what actually replaces it. A standard Gatorade bottle has 270 mg sodium for 500 mL. Tailwind runs 310 mg. LMNT runs 1000 mg in a packet. Salt tablets add 200-400 mg each. Here is how to match the loss to the right product.
Quick answer
The calculator gives you milligrams; this guide turns milligrams into bottles and tablets.
Key points
- ▸ Standard sports drinks: 200-300 mg sodium per 500 mL. Adequate for under-2h events; under-doses salty sweaters on long events.
- ▸ High-sodium endurance drinks (LMNT, Precision Hydration): 500-1000 mg per serving. Built for multi-hour heat and salty-sweater profiles.
- ▸ Salt tablets: 200-400 mg each. Swallow with 200-300 mL water per tablet to avoid GI distress.
- ▸ Food replaces better than drinks long-term. Post-session meals with salt, potassium-rich foods (bananas, potatoes, leafy greens) cover magnesium and potassium easily.
- ▸ Fluid-first rule: over-salting under-hydrated is worse than under-salting hydrated. Fix water balance first, then ions.
Examples
- Lost 2000 mg Na over 2.5h4 × 500 mL of standard sports drink (~1100 mg) + 2 salt tablets (600 mg) + post-session salted meal. Total ~2000 mg.
- Ultra 6-hour eventPlan 400-500 mg sodium per hour during, then high-salt meal after. LMNT packet per hour is the easy math.
- Sub-1h gym sessionPlain water is fine. Post-session food covers residual needs. Skip the sports drink — those calories are better spent elsewhere.
When to use which tool
- Ion Balance · Electrolyte LossBefore races and long training days to build a replacement plan.Sodium, potassium, chloride, and magnesium lost through sweat over a training session. Replacement targets for endurance events.
- Thermal Failure · WBGTIn high WBGT conditions, sodium needs scale up beyond the baseline estimate.Wet-bulb globe temperature — the heat-stress index used by OSHA, ACGIH, and military for work/rest cycle decisions.
Related
- Ion Balance · Electrolyte LossSodium, potassium, chloride, and magnesium lost through sweat over a training session. Replacement targets for endurance events.
- Thermal Failure · WBGTWet-bulb globe temperature — the heat-stress index used by OSHA, ACGIH, and military for work/rest cycle decisions.
- Electrolyte Loss in SweatSodium, potassium, chloride, and magnesium — how much each litre of sweat costs you.
- When Electrolyte Math Goes WrongHyponatremia, hypernatremia, and the dangerous zones on either side.
- What WBGT MeasuresThe military and OSHA heat-stress index, explained.
Frequently asked questions
› Are electrolyte supplements necessary for daily life?
No. Normal diets cover sodium, potassium, and magnesium comfortably unless you sweat heavily daily. Supplementation is an endurance-event and heat-exposure tool, not a wellness habit.
› What about potassium? My drink has almost none.
Sweat sodium loss is 4-5x potassium loss, so sodium dominates the replacement math. Potassium comes from food — one banana is 400+ mg. Unless you are doing multi-day extreme events, food potassium covers it.
› How should I use this guide with a Kefiw tool? How-to
Use the guide as the plan and the linked Kefiw tool as the check. Read the steps first, try the move manually, then use the tool to compare outputs, catch edge cases, and decide whether the result actually fits your task.
› What mistake do tool guides help avoid? Troubleshooting
Tool guides help avoid using a utility mechanically without understanding what you are trying to accomplish. Most word, writing, and text utilities are fast, but speed can hide context mistakes. Know whether you are solving a puzzle, cleaning copy, drafting a line, or checking a rule.
› Can a tool guide help me learn the skill? How-to
A tool guide can help you learn if you pause before accepting the output and ask why it worked. Compare your first guess with the tool result, look for the rule or pattern, and repeat that review. Passive copying solves one task; active review builds the skill.