Try this, Taffy: http://www.calculator.net/calorie-calculator.html
I used it myself a few times and found it to be a good predictor of weight loss; (there was a small discrepancy in what my level of exercise was supposed to be but otherwise, it was quite good).

Thanks, Fifi, put that on the desktop. I notice one needs far fewer calories to maintain your weight at my age than a 25 year old. I suppose it would help if I started smoking- or is it the other way around? But an excellent tool.