Even if you're over 40 the range you gave would be an unhealthy deficit for most.
This free BMR calculator estimates basal metabolic rate based on well-known formulas. Learn more about variables that affect BMR, and explore hundreds of other calculators addressing topics such as fitness, health, math, and finance, among others.
https://www.calculator.net/bmr-calculator.html[https://www.calculator.net/bmr-calculator.html?ctype=standard&cage=45&csex=m&cheightfeet=6&cheightinch=3&cpound=210&cheightmeter=180&ckg=60&cmop=0&coutunit=c&cformula=m&cfatpct=20&x=48&y=18]