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Post-Workout Protein Timing Calculator

Calculate the recommended protein amount for your post-workout meal based on body weight.

Result

Recommended Post-Workout Protein
18-29g

Based on commonly cited sports nutrition research suggesting roughly 0.25-0.4g of protein per kg of body weight per meal maximizes muscle protein synthesis - beyond this range, additional protein in a single sitting shows diminishing returns for that specific meal's anabolic response, though it still counts toward your daily total.

About the Post-Workout Protein

The Post-Workout Protein Timing Calculator estimates a recommended protein range for a post-workout meal based on body weight alone. It converts a pounds-based weight entry into a gram range intended to reflect commonly cited sports nutrition guidance for a single meal.

How It Works

You enter body weight in pounds. The calculator converts that to kilograms, then multiplies by two per-kilogram factors, 0.25 and 0.4, to produce a low and high gram figure for the recommended post-workout protein range.

weightKg = bodyWeightLb * 0.453592. lowG = weightKg * 0.25. highG = weightKg * 0.4.

Formula & Methodology

To calculate this by hand, multiply body weight in pounds by 0.453592 to convert to kilograms. Multiply that kilogram figure by 0.25 for the low end of the range and by 0.4 for the high end. For a 180 lb person, that is 180 x 0.453592 = 81.6 kg, giving a low end of 81.6 x 0.25 = 20.4g and a high end of 81.6 x 0.4 = 32.7g.

Examples

A 140 lb person

Converting 140 lb to kilograms gives 140 x 0.453592 = 63.5 kg. The range is 63.5 x 0.25 = 15.9g on the low end and 63.5 x 0.4 = 25.4g on the high end, displayed as roughly 16-25g.

A 220 lb person

Converting 220 lb to kilograms gives 220 x 0.453592 = 99.8 kg. The range is 99.8 x 0.25 = 24.9g on the low end and 99.8 x 0.4 = 39.9g on the high end, displayed as roughly 25-40g.

Advantages

  • Turns a body weight figure into a concrete gram range instead of a vague single-number recommendation.
  • Requires only one input, so it can be checked quickly right after finishing a workout.
  • Presents a range rather than one fixed number, reflecting that there is a band of reasonable amounts rather than one exact figure.

Common Mistakes

  • Believing protein must be consumed within a strict narrow window immediately after training, when the tool's own guidance notes this rigid anabolic window idea has been substantially revised by more recent research.
  • Treating the displayed range as a full daily protein target rather than the amount suggested for one post-workout meal specifically.
  • Ignoring meals eaten shortly before training, which can reduce the practical need to hit the high end of this range immediately afterward.

Edge Cases to Watch For

  • The calculator uses only body weight, with no field for activity type, training intensity, or total daily protein target, so it produces the same per-meal range regardless of the workout that preceded it.
  • The result describes a single meal's protein amount, not a daily total, and the tool's own note states that protein beyond this range in one sitting still counts toward the day's total even if that meal's own anabolic response has diminishing returns.
  • The 0.25 to 0.4 g/kg range reflects commonly cited sports nutrition guidance rather than a fixed clinical requirement, so results should be read as a range to work within rather than a precise target.

Common Use Cases

  • Someone planning a post-workout shake or meal who wants a concrete gram target based on their own body weight.
  • A person trying to avoid both under-eating and unnecessarily over-eating protein in a single sitting after training.
  • An athlete or lifter comparing this range against a protein powder scoop size to figure out how many scoops to use.
Written & fact-checked by the Calculateus TeamLast updated August 5, 2026How we verify our formulas

Frequently asked questions

Does protein have to be consumed immediately after a workout to count (the "anabolic window")?

The idea of a narrow 30-60 minute post-workout "anabolic window" has been substantially revised by more recent research - as long as adequate protein is consumed within a few hours of training (and your total daily protein intake is sufficient), the precise timing appears far less critical than earlier sports nutrition advice suggested, especially if you ate a normal meal within a couple hours before training.

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Conclusion

This calculator converts body weight into a practical gram range for post-workout protein intake using a widely cited per-kilogram guideline. It is best used as a starting reference for one meal, within the context of a person's total daily protein intake.

References