I am sorry to disagree, but calories counting is rubbish!
There is excellent science on this by Prof Tim Spector on the Zoe website.
Also the idea of a 'diet' is also outdated.
You could eat your calorie 'allowance' in a day with crisps and Mars bar, but would that be healthy?
It's all about eating healthily.
If you make your diet mainly plants, and add in some protein (meat, fish, eggs, dairy, pulses) nuts, seeds, and cut out the refined carbs, apart from an occasional treat, the weight should fall off.
Cook from scratch-it takes no time at all to bake or poach a salmon fillet and make a bowl of salad with avocado, leaves, grated carrots, peppers, etc.
or the same with a chicken breast, or prawns, or even quality burger (ditch the white bun.)
Lunch can be homemade veg soup made in a big batch, frozen into portions.
You can still eat spag bol, curries, etc but swap the pasta for wholewheat, white rice for brown, watch the portions and make a salad to go with the pasta.
A portion of carbs should be fist-sized, not enough to fill the entire plate.