Creatine Dosage Calculator

How this calculator works

Creatine is one of the few supplements where the dose question has a settled answer. The International Society of Sports Nutrition's 2017 position stand describes two routes: load with about 0.3 grams per kilogram of body weight a day for 5 to 7 days and then hold at 3 to 5 grams a day, or skip loading and take 3 to 5 grams a day from the start, which reaches the same level in about four weeks.

Enter your body weight and pick a strategy. For maintenance the calculator uses about 0.03 grams of creatine per kg, rounded to whole grams, never below 3 grams and capped at 5. That means 3 grams for most adults and 4 to 5 grams above roughly 220 lb. For loading it multiplies your weight in kilograms by 0.3 and splits the total into four servings so no single dose is large. A 150 lb woman (68 kg) gets about 20 grams a day for a week as 4 × 5 g, then 3 grams a day.

The vegetarian toggle does not change the dose, only the note under the result: meat and fish are the only meaningful food sources, so people who eat little of them start lower and usually see the bigger change.

Some protocols go higher: the ISSN notes larger athletes may need 5 to 10 grams a day, and several older-adult trials use 0.1 grams per kg. Reasonable, but not the default here.

How to read your result

The loading number is a daily total: take it as four roughly equal servings with meals for 5 to 7 days, then drop to maintenance.

Time to saturation

With loading, muscle stores are essentially full after 5 to 7 days. Without it, plan on about 28 days. In the 1996 study by Hultman and colleagues, men who took 20 grams a day for six days and men who took 3 grams a day for 28 days ended up with the same muscle creatine content. Loading buys you three weeks, nothing more.

Why vegetarians respond more

The body makes about half of the 1 to 3 grams of creatine it turns over daily; the rest comes from food. A typical meat-eating diet supplies roughly 1 gram a day, and cooking converts some of it to creatinine, so the plate delivers less than the raw numbers below.

Plants contain essentially none, so vegetarians and vegans start with lower muscle creatine and in trials show a larger rise in stores and performance once they supplement. Same dose, bigger gap to close.

Where the number misleads

Kidney disease and the creatinine artifact

In healthy people, the ISSN found no harm to kidney function at doses up to 30 grams a day for as long as five years. That does not extend to people who already have kidney disease or take drugs that stress the kidneys; for them this is a nephrologist conversation. Separately, creatine breaks down into creatinine, the marker used to estimate kidney filtration, so supplementing can make your eGFR look lower on a routine panel although nothing is wrong. Tell your doctor before blood work; a cystatin C test is not affected.

Pregnancy and breastfeeding

There are no adequate human safety data. Skip it, and ask your obstetrician about restarting afterward.

Water weight and stomach trouble

Expect 1 to 2 lb on the scale in the first week, sometimes more with loading. The water goes into muscle cells, not under the skin, and it is short-lived. Single doses of 10 grams or more can cause cramping or loose stools, which is why the loading total is split into four; take servings with food, fully dissolved.

Gummies, HCl and other forms

Monohydrate is the form used in nearly every trial, and the ISSN calls it the most effective and best-studied; HCl, buffered creatine and blends have not beaten it head to head. Gummies carry small doses per piece, and independent lab tests have found some with far less creatine than labeled. Plain powder is cheaper and more reliable.

Older adults: the number is not too high

A 2017 meta-analysis of older adults doing resistance training found that adding creatine produced about 1.4 kg (3 lb) more lean mass than training alone. Older muscle responds to the same 3 to 5 grams and the same strength work; a smaller dose is not safer, just less effective.

What to do with it

1. Pick a strategy you will keep. Loading gets you there in a week but means four servings a day; 3 to 5 grams daily gets there in four weeks with one scoop. Both end in the same place, and there is no need to cycle off.
2. Buy plain creatine monohydrate with a third-party seal (NSF Certified for Sport, Informed Sport) or Creapure raw material, and compare price per 5 gram serving; expect 15 to 50 cents.
3. Take it every day, rest days included. Timing matters little; with a carbohydrate-and-protein meal near a workout is a small plus, but consistency beats the clock. We covered the midlife case in creatine after 40.
4. Drink normally. The water note means keep your usual fluid intake, not add a gallon.
5. Pair it with protein and strength work. Creatine amplifies training and does little on its own. Protein at breakfast is the easiest place to raise intake, and supplements worth taking after 50 puts creatine next to the rest of the shelf. Mention it to your clinician before your next blood panel.