The major flaw of most calculator is that they don't use the adjusted weight. If you are overweight, a big portion of your weight is fat which doesn't perform any useful function, nor do you need maintaining.
You should put your "adjusted" weight into the calculator or even our ideal bodyweight.
By using these online calculators, people are given a daily allowance which is excessive and makes losing weight harder .
@housecoat1968 well done for planning to take your health and your weight in the right direction.
Clean your kitchen of all the wrong food. Get rid of it. Either gift or bin the sugary treats, the savoury snacks, the processed sauces, refined grains, and fill your fridge with vegetables. Have a big salad for lunch with several vegetables such as green beans, with tomatoes, cucumbers, red onions, with either tuna or boiled eggs for lunch and a lovely soup for dinner with maybe a couple table spoons of quinoa. Or a spinach, arugula, quarter of avocado and a couple of slices of apples for lunch and a chicken breast with oven roasted vegetables for dinner.
As a summer read, buy the "path to longevity" by Luigi Fontana , plenty of great advice on diet.
Change the way you eat, not the quantity, go for variety, try new food, roast some asparagus in a pan and put a couple slices prosciutto on top and sliced almonds. take the challenge to eat at least 20 different vegetables every week. Every food, even vegetables have amino acids, so you don't need to eat those heavy protein 3 times a day. Keep them for either lunch or dinner. Discover new recipes.
Food is not only the sum of fat, carb and protein, but what you eat will affect your gut and your looks. By eating a lot of vegetables and staying clear of processed meats (ham, bacon, ...) and processed food even "healthy" processed food, you will get better skin (the glow) , better sleep, better gut.
It is summer , so think watermelon, cherries, strawberries.A gorgeous tomatoes salad, lovely seafood. Spend 15 min a day without sunscreen in the sun to get vitamin D and then cover or put sunscreen.
Make it about you and not your weight. Don't buy snacks, If you are starving and about to hit the shops for rubbish, throw two handfuls of frozen edamame in a pot of boiling water for 5 min, put in a bowl, add salt, shake and have these instead.
It is food first, food second, food third and then as fourth the gym, but it needs to be enjoyable. Have a walk twice a day listening to a podcast or enjoying the view or the company of a friend.
Overdoing it at the gym might backfire and actually make it harder to lose weight. Yes, do weights or a class, but be very mindful of the spike in appetite after. Have a herbal tea and not a protein shake which will ruin the effort. Green tea instead of low cal chocolate sachet and so on.
Good luck on your journey 