Creatine Calculator

How This Creatine Calculator Works

Creatine monohydrate is one of the most studied dietary supplements in sports science. It works by helping your muscles regenerate adenosine triphosphate (ATP), the molecule your body uses for short, high-output movements like sprints, jumps, and heavy lifts. The math behind a creatine plan isn’t complicated — it’s basically two questions: (1) how much do I take per day, and (2) how long does a tub last me?

Loading vs. Maintenance — A Practical Explanation

There are two commonly referenced ways to start creatine, and both land you in the same place: a fully saturated muscle creatine pool. The difference is just how fast you get there.

• Maintenance only. Take roughly 3–5 grams every day. Your muscles reach saturation in about 3–4 weeks. This is the simplest approach and the one most people stick with long-term.
• Loading + maintenance. Take about 0.3 g per kg of bodyweight per day (often referenced as 20 g/day, split into four 5 g servings) for 5–7 days, then drop to 3–5 g/day. You saturate in about a week instead of a month. Some people get mild stomach discomfort during this phase — splitting the dose helps.

Loading isn’t required. It’s an option for people who want results faster (e.g., before a training block). If you’re unsure, the maintenance-only path is the conservative default this calculator suggests.

The Bodyweight-Based Math

The dose this calculator suggests is based on the commonly referenced figure of ~0.03 g/kg/day, normalized into the standard 3–5 g/day range. That means a 60 kg person and a 110 kg person both end up roughly in that band — heavier people have more muscle mass to saturate, but the dose tops out at the high end of the everyday range. There’s no benefit to taking more than 5 g/day for maintenance once your muscle stores are saturated.

For loading, the same logic applies but at 10× the dose: roughly 0.3 g/kg/day for 5–7 days, split into multiple smaller servings. Your training frequency (3–4 days/week) doesn’t change the dose itself — creatine works by keeping your muscles saturated, which means you take it on rest days too.

Cost Per Gram: The Only Number That Matters

Creatine monohydrate is a commodity supplement. Most reputable brands sell roughly the same powder. The honest way to compare two products is cost per gram, which this calculator computes for you when you enter container size and price. As a rough guide:

• $0.03–$0.05 / gram is genuinely good value.
• $0.06–$0.08 / gram is typical retail pricing.
• $0.10+ / gram usually reflects branding, flavors, or marketing — not better creatine.

A 500 g tub at $25 works out to $0.05/g, or about $7.50/month at 5 g/day. A 60-serving flavored stick pack at $30 might be $0.20/g — four times more expensive for the same molecule.

When You’ll Run Out

Once you know your daily dose and your container size, container duration is just division. A 500 g container at 5 g/day lasts 100 days. The plan-for field above lets you flip it the other way: enter how many days you want to plan for, and the calculator tells you how many grams (and how many containers) you’ll need. Useful for budgeting, road trips, or stocking up during a sale.

Related Calculators

Creatine pairs naturally with other nutrition and training calculators:

• Pair this with our Protein Calculator to estimate your daily protein target alongside your supplement plan.
• Use the Macro Calculator to split daily calories into protein, carbs, and fats.
• See your TDEE and BMR to set a calorie target.
• Check hydration needs — creatine pulls some water into muscle cells, so staying hydrated is worth keeping an eye on.

Frequently Asked Questions