Lisa
The calorie deficit needed projections on this site are not very accurate.
It depends a lot on your health conditions, your age etc which all influence your metabolism. I think MFP by default tells me to eat 1800cal per day. A slimming club once told me to eat 750 calories per day. From past experimentation I know I do best eating between 1000-1500 cal per day depending on activities and appetite.

here is another site that works it out for you
http://www.calculator.net/calorie-calculator.html?ctype=standard&cage=47&csex=f&cheightfeet=5&cheightinch=6&cpound=297&cheightmeter=180&ckg=60&cactivity=1.2&printit=0&x=47&y=13
this is what it says for me age 35, 292lb, sedentary
I select sedentary because even though i walk about sometimes I spend most of the day not moving much at all.
You need 2,501 Calories/day to maintain your weight.
You need 2,001 Calories/day to lose 1 lb per week.
You need 1,501 Calories/day to lose 2 lb per week.
You need 3,001 Calories/day to gain 1 lb per week.
You need 3,501 Calories/day to gain 2 lb per week.

this is what it says if I change my stats to age 47, 397lb, sedentary
You need 2,943 Calories/day to maintain your weight.
You need 2,443 Calories/day to lose 1 lb per week.
You need 1,943 Calories/day to lose 2 lb per week.
You need 3,443 Calories/day to gain 1 lb per week.
You need 3,943 Calories/day to gain 2 lb per week.

So looking at that 3000cal per day would not lead to much weight loss. Really only a nutritionist or dietitian who knows your exact health can give an accurate answer. All internet sites will only give estimates based on whichever standardised formula they select to use.

1lb loss is still better than a gain, it is still a loss. You might be able to lose more if eat fewer calories but only you can decide what is right for you. If you lost 1lb every week that still all adds up over time. Maybe gradually lower it over several weeks to 2000 calories and see how you feel, if it feels sustainable or not. You know your body better than anyone else.