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Nutrition calculator

Calorie Surplus
Calculator

Plan a controlled calorie surplus for lean muscle gain. Enter maintenance calories and a preferred adjustment to plan a practical daily target.

Start Surplus Explore Nutrition
100% privateInstant resultsNo sign-up
1Enter your details

Calculate your result

Use realistic, recent measurements for the most useful estimate.

100% privateInputs stay in this browserInstant resultsCalculated in real timeNo sign-upFree to use
2Your result
SurplusREADYStart with the form

Your result will appear here

Complete the form and select “Calculate result.” Your measurements never leave this page.

Educational estimate only—not medical advice.
Understand your result

How your Surplus estimate is created

A transparent overview of the inputs, method, and appropriate interpretation.

Evidence-informed Browser based
How it works

About this Surplus estimate

It applies the chosen percentage to maintenance calories to create a controlled daily target, then translates the difference into a theoretical weekly weight-change estimate.

Percentage-based calorie adjustment
Maintenance + goal→Calorie adjustment=Estimated Surplus
  1. 01Enter details
  2. 02Review inputs
  3. 03Use the estimate
Private by designNo account requiredInputs are not stored
Common questions

Calorie Surplus Calculator FAQ

Clear answers to help you understand and use your estimate.

01Is the Calorie Surplus Calculator free and private?

Yes. It is free, runs in your browser, requires no account, and does not store the measurements you enter.

02Can I use this result as medical advice?

No. This result is an educational estimate, not a diagnosis or treatment recommendation. A qualified professional can interpret it within your complete health and training context.

03Why might my Surplus result differ from a real-world result?

Water balance, adherence, activity, adaptive changes, food tracking, and the approximate energy value of tissue all affect real weight change.

04How often should I recalculate Surplus?

Recalculate when your maintenance estimate or selected adjustment changes. Use the result as a planning reference rather than a guaranteed rate of weight change.

Read our calculation methodology →Still have questions? Explore the guides ↗