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Estimated caffeine remaining

Calculate estimated caffeine remaining using the values and assumptions you provide.

Calculate estimated caffeine remaining using the values and assumptions you provide.

Both dots and commas are accepted as decimal separators.

Your inputs stay in your browser. Displayed results are rounded to a maximum of 12 significant digits.

Method and assumptions

Method version 1.0.0 · Updated

Calculate

Formula: Remaining dose = initial dose × 0.5^(elapsed time / half-life)

Calculate estimated caffeine remaining using the values and assumptions you provide.

initialMg
Initial dose (mg)
hours
Elapsed time (hours)
halfLife
Estimated half-life (hours)

Results depend on the assumptions entered; verify professional or safety-critical decisions independently.

Calculate with code

These short examples use the same inputs and core calculation as this tool. Adapt validation and formatting to your application.

JavaScript
const initialMg = 100, halfLifeHours = 5, elapsedHours = 10;
console.log(initialMg * 0.5 ** (elapsedHours / halfLifeHours)); // 25 mg estimated
TypeScript
const initialMg=100, halfLife=5, elapsed=10;
const remaining: number = initialMg * 0.5 ** (elapsed/halfLife);
console.log(remaining); // 25 mg estimate
Python
initial, half_life, elapsed = 100, 5, 10
print(initial * 0.5 ** (elapsed / half_life))  # 25 mg estimate
Java
System.out.println(100 * Math.pow(0.5, 10.0/5)); // 25 mg estimate
C#
Console.WriteLine(100 * Math.Pow(0.5, 10.0/5)); // 25 mg estimate