Health & Fitness
Calorie Deficit Calculator
Subtract a chosen deficit from maintenance calories and show an energy-equivalent estimate.
For non-pregnant adults only. Not appropriate for children, pregnancy, breastfeeding or medical nutrition planning. Estimates do not replace advice from a qualified clinician. Does not estimate metabolism or choose a safe deficit. Intake below 1,500 kcal/day triggers a caution, but that threshold is not a personalized safety assessment.
Good to know
Frequently asked questions
How do I use it?
Fill in the options and press “Calculate”. Check the result, then copy or download it.
How does it work?
Daily intake equals your maintenance estimate minus your chosen deficit. Weekly energy equivalent equals deficit × 7 ÷ 7,700 kcal/kg; this is arithmetic, not a forecast of actual weight loss.
Are there limitations?
For non-pregnant adults only. Not appropriate for children, pregnancy, breastfeeding or medical nutrition planning. Estimates do not replace advice from a qualified clinician. Does not estimate metabolism or choose a safe deficit. Intake below 1,500 kcal/day triggers a caution, but that threshold is not a personalized safety assessment.
Is my data uploaded?
No. Everything is processed in your browser and nothing is sent to a server. No account is needed.
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