Oh and before I forget: here's another calculator- I should have posted the link to this one before but
here it is. It's a Calorie Calculator.
So once you type in your age, gender, weight, height, and exercise level, you'll be given your maintenance calories. Mine is 1893 Calories per day that I should be consuming if I want to keep my current weight of 115 lbs.
Then it'll give you your fat loss calories: the amount of calories you need to consume to lose weight by diet alone. To reinforce your weightloss even more, you'll have to exercise too.
then it'll show you an 'Extreme fat loss' number to see how many calories you need to really lose weight. Mines under 1200 Cals for that but I won't use it since it's below the recommended '1200'. I highly recommend ignoring the extreme fat loss one and stick to just 'fat loss' calories.
So once you know how much calories you need to lose weight, simply write in a journal/notebook of each food that you consume and write down how much calories each food contains.
If you've got an iPod touch, iPhone, or iPad, you can download this free app called: Calorie Counter & Diet tracker by MyFitnessPal. And this app - when connected with the internet, literally has a crapload of info when it comes to what each food contains- calorie wise.
For example: if you had kiwi for breakfast, simply type in 'kiwi' in the search bar, hit enter, and it'll literally give you a List of the different sizes, brands, and types of kiwi along with how much calories it has and even the nutritional info it has. You can keep searching throughout the day and once you select the right kiwi in the list, it'll count up the calories and you can select multiple other foods that you consumed and it'll calculate the kiwi cals AND the other foods you selected so that by the end of the day, you'll know exactly how much calories you consumed.
It's pretty much a journal in and of itself. There's a Monday-Friday + exact month date, and year so you'll know what you ate yesterday or a week before, etc.
Highly recommend the app. If not, manual journaling is also great too! The internet has plenty of sources to tell you how much calories you're consuming for each food you eat.
Btw- I'd like to apologize in advance if you already knew most of the stuff I posted. This was kind of like a copy and paste from one of my previous replies to another who's also getting her life back on track. I figured it wouldn't be too much to go over some of the basics in detail : )