Creatine Dose Calculator (loading & maintenance)

Understanding the creatine dose calculator — concept and principle

Creatine monohydrate is one of the most studied sports supplements. It raises the amount of phosphocreatine stored in muscle, which supports repeated short, intense efforts such as sprints and weight training. This calculator sizes a loading dose to your body weight and gives the usual maintenance dose.

How it is calculated

• Loading dose (g/day) = body weight (kg) × 0.3, for 5–7 days, split into about 4 doses
• Maintenance (g/day) = the larger of 3 g or body weight × 0.03, up to 5 g

The loading dose is rounded to whole grams. Weight is in kilograms.

The principle

Muscle cells use phosphocreatine to rebuild ATP, the cell's immediate energy source, during the first seconds of maximal effort. A normal diet with meat and fish fills muscle creatine stores to roughly 60–80% of their maximum. Supplementation tops them up. A high intake of about 0.3 g/kg a day saturates the muscles within 5–7 days; after that, a smaller daily amount of 3–5 g replaces what is broken down to creatinine and excreted. If you skip loading and take 3–5 g a day from the start, you reach the same saturation in about four weeks. Splitting the loading dose reduces stomach upset and improves uptake.

Worked example

1. Default input: body weight 75 kg.
2. Loading = 75 × 0.3 = 22.5, rounded to 23 g/day, split into 4 doses (about 5–6 g each).
3. Maintenance: 75 × 0.03 = 2.25 g, which is below 3 g, so the lower end is 3 g, giving 3 – 5 g/day.

The calculator shows 23 g/day for loading and 3 – 5 g/day for maintenance.

How to read the result

Loading is optional; it only gets you to full stores sooner. Larger, very muscular athletes may sit at the top of the maintenance range. Expect a gain of about 1–2 kg in the first week, mostly water drawn into muscle cells. People who eat little meat or fish usually start with lower stores and often respond more. Not everyone responds, and benefits are mainly for short, high-intensity work rather than long endurance.

Common mistakes

• Taking the loading dose in one go, which raises the risk of stomach upset.
• Continuing to "load" for weeks; after saturation, extra creatine is simply excreted.
• Expecting a lab creatinine result to be unaffected; supplements raise blood creatinine without kidney damage, so tell your doctor.

Frequently asked questions

Do I need to cycle creatine?

No evidence shows a need to cycle it; daily maintenance can be continued.

Does the timing matter?

Taking it consistently matters more than timing; some studies suggest a small benefit from taking it around training with food.

Is creatine hydrochloride better than monohydrate?

Monohydrate is the form with the most research behind it; other forms have not been shown to work better.

Sources: Kreider RB et al. International Society of Sports Nutrition position stand: safety and efficacy of creatine supplementation in exercise, sport, and medicine. J Int Soc Sports Nutr. 2017.