General estimate
Calorie Needs Calculator
Estimates maintenance energy needs; actual needs vary.
How this estimate is calculated
Mifflin–St Jeor resting energy multiplied by an activity factor.
How to use the result
Treat it as a starting point to compare against how you actually feel and what you actually eat. Estimates are most useful for spotting a large gap, not for chasing a precise number.
What this cannot tell you
This estimates maintenance, not a target. Appetite, weight trend over several weeks and how you feel are better guides than any single number.
Estimates, not measurements: this tool runs a population equation, so it describes a typical person with your inputs rather than measuring you. Where a number drives a decision about a diagnosed condition or medication, have a dietitian or clinician sanity-check it against your history.