Free Calorie Calculator — Why Your Deficit Stops Working

Last updated: April 17, 2026

MoneyMath's calorie calculator estimates daily calorie targets and highlights metabolic adaptation, plateaus, diet breaks, and protein needs so users can plan beyond simple deficit math.

Free to useRuns in your browserTransparent assumptions

Free calorie calculator with metabolic adaptation and plateau predictor. See why your deficit stops working at week 12, get a diet break strategy, and find your protein minimum during a cut.

Use the Calorie Calculator to compare realistic scenarios before making a money, health, or planning decision.

Adjust the inputs and review the result breakdown so you can see which assumptions matter most.

How to use this calculator

Step 1Enter your starting information. Add the core inputs requested by the Calorie Calculator, such as amounts, dates, rates, income, weight, or other scenario details.
Step 2Review the calculated result. Read the headline answer first, then scan the supporting breakdown, chart, or comparison table.
Step 3Compare another scenario. Change one input at a time to understand what drives the result and which option is most realistic.

Formula, Sources & Assumptions

Formula

Calorie targets start with TDEE, then apply goal-specific deficits or surpluses and adaptation assumptions.

Assumptions

Results are estimates for planning and education.
Actual costs, taxes, rates, or outcomes may differ based on personal circumstances and updated rules.