Reaching goal on time.

Both.

Yes, it's too ambitious. Healthy weight loss is .5-2 pounds per week, with the higher numbers reserved for those who have more to lose.

10-15 pounds is a much more attainable goal in that time.

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We can work out the math.

3.36 pounds per week x 3500 = 11,760 calories per week goal deficit or 1680 per day.

Assuming you eat 1600-1800 per day, you'd need to burn on average about 3400 per day. 3400 out less 1700 in = 1700 deficit. *My assumption is that if you're working enough to burn 3000+ per day you're going to need to eat beyond the 1200/day minimum recommended level.

To burn 3400 per day:

BMR 1465 per day (estimate, based on your age & current weight should be close)
Activity 250-400 per day (depending on how active your job, etc. is)
Exercise/cardio 1500-1800

You'll burn an additional 300-325 calories per hour of brisk walking (approx 4.0 mph). So walk 20-25 miles a day and you'll be on target to hit your goal. Though as you lose weight, your BMR and calories burned for activity/cardio go down so you'd need to do more to keep up the deficit #.

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If you're human, and just starting, that probably is NOT a realistic plan. So instead get started on something now that IS realistic. Perhaps aim to walk (insert other activity if you prefer) 30-60 minutes a day, aim for balanced nutrition in the 1400-1800 range, and expect to lose 1-2 pounds per week on average.

There are great clothes to be found at thrift stores in my town. Why not budget for a fifty dollar shopping spree at the thrift store before your vacation? You could get about ten items that would be really fun. Then save the rest of your money for goal weight.

1200 + exercise calories. If you work out aggressively, your body is going to need additional fuel. And in the above math example, walking 20-25 miles a day on 1200 calories in: you won't make it to the end of the 2nd week. Simply won't have the energy...

NerdyNix wrote: »

Yes I think I will fit in them if I can get wishing 7lbs of the goal maybe as I have been losing more inches than lbs. lost 5 inches on my hips so far by exercising everyday.

I'm on 1200 calories a day according to MFP. Set at lightly active.

NerdyNix wrote: »

So I weigh 167lbs now. To fit into my skinny clothes I need to be around 130. So I need to lose close to 37lbs in 11 weeks which I think is just over 3lb a week.

Is this too ambitious or do you think it's possible?

I think that is a tough goal and kind of unrealistic. You most likely will not be able to drop 3 lbs every single week. You will most likely have to eat very little and/or spend a great deal of time exercising for 11 weeks and after your vacation will gain weight back because it is not sustainable. You may not lose inches/clothing sizes as fast as you think. You may not feel very good.

Please see this thread about how weight loss is not linear-> community.myfitnesspal.com/en/discussion/10084670/it-is-unlikely-that-you-will-lose-weight-consistently-i-e-weight-loss-is-not-linear/p1
And this ->community.myfitnesspal.com/en/discussion/10177910/most-helpful-posts-general-diet-and-weight-loss-help-must-reads#latest

If I were you, I would accept that losing .5-2 lbs a week is a better goal range to shoot for. 10- 20 lbs would be more realistic and comfortable goals for 11 weeks.

Buy stretchy clothes or dresses that you can wear with a belt as you are losing weight. Get some clothes altered to fit you as you get smaller. Shop at thrift stores, sales or e-bay. Exchange clothes with other people who have lost weight. I believe there are sites where you can rent clothes.

So about that 42 pounds that you lost rapidly before. . . did you keep those pounds off? If not, perhaps trying to do the same thing again is not so wise.