The Ultimate Weight Loss Calculator – IMPERIAL VERSION


Welcome to the Ultimate Weight Loss Calculator!

If you prefer cm and kg, click here for the metric version!

  • Basic Information

  • Additional information

    (Enter additional information here to get more detailed results below. It's ok to leave some or all of these blank if you don't want the detailed results.)
  • Your Results!

  • BMI Information

    If you chose "small frame size" or "large frame size" above, these results are adjusted by 10% and are NOT equivalent to the medically accepted BMI formula. They should DEFINITELY NOT be taken as medical advice.
  • Your ideal weight range is
  • Your BMR and Daily Calorie Needs

  • Weight Loss Predictor

  • Diet Planners

    The Zig-zag diet planner below is based on your Intended Calorie Intake Per Day in the Additional Information section above. The 5:2 diet planner below is calculated from your TDEE (Total Daily Energy Expenditure .

  • Zig-Zag Diet Planner

  • Varying your calories each day can add variety to your diet and help you stick to your plan.
  • 5:2 Diet Planner

  • If you follow the 5:2 Diet (Also known as the Fast Diet), this will calculate your daily calorie goals based on your total daily energy expenditure.

 Click the little printer to print or save your weight loss calculator results!

Important Information!

What your BMI means

Less than 15 = Very severely underweight
From 15.0 to 16.0 = Severely underweight
From 16.0 to 18.5 = Underweight
From 18.5 to 25 = Normal (healthy weight)
From 25 to 30 = Overweight
From 30 to 35 = Obese Class I (Moderately obese)
From 35 to 40 = Obese Class II (Severely obese)
Over 40 = Obese Class III (Very severely obese)

How fast should you lose weight?

I know it’s tempting to lose weight as fast as possible – but what’s the point, if you put it straight back on again? Losing weight gradually and healthily is the best way to ensure you maintain your goal weight when you reach it.

If you need to lose more than 50lbs in total, 2 lbs per week is a realistic, healthy and maintainable weight loss rate to aim for.

If you need to lose between 20 and 50lbs in total, 1 lb per week is a realistic, healthy and maintainable weight loss rate to aim for.

If you need to lose less than 20lbs, 0.5lb per week is a realistic, healthy and maintainable weight loss rate to aim for.

If there are any more features you’d like to see included here, please drop me a line in the comments.

A Word About Motivation

We know that if you eat fewer calories than you burn, you will lose weight. So why is it so tough to stick to it?

I think it’s in part due to the society we live in, where unhealthy food is constantly available and selling it to us is big business. When delicious food is always easily accessible, it’s really difficult to know when to stop eating, and very easy to eat due to boredom, stress, habit, or just because it’s there.

Additionally, our bodies didn’t evolve to make losing weight easy. Your body is designed to store fat for fuel in case there’s a famine around the corner, and will only use those fat reserves when there isn’t sufficient food available. This is part of the reason why sticking to a diet is so difficult – you feel physical hunger, and every natural impulse tells you to go eat something, despite the fact that you may be unhealthily overweight.

Fortunately, you have a brain as well as a body, and you have the power right now to control what you eat and thereby determine what you weigh.

Losing weight isn’t actually that tough, if you’re in the right state of mind. All you have to do is eat less than you burn each day, and the weight will come off. I personally think the key is all about attitude – if you can see refusing a delicious plate of your favourite food as a positive, empowering decision, rather than a deprivation, you’re on the right track.

If you’re interested in knowing more about this approach to weight loss, I’d highly recommend this book.


  1. This seems to be the “Google” equivalent of a weight loss calculator. It is simple, and gets the job done simply and easily.

    Zig-Zag is interesting.

    Nice program. Will share.


      Thanks! I’m really glad it’s proving a useful resource. Don’t hesitate to let me know if you have any feedback, ideas for other features or calculations etc.

  2. This is really good. Nice having all the calculators in one place and the fact that you get to see all the calorie intake results at one time is also helpful.

  3. I have a lot of #REF! instead of info. I have filled out everything but still have this message or code:(

  4. I like this so much.

    Thank You!

  5. Great info and I really like the idea of zig zag planner, I struggle with having higher calories on weekends and this gave me ideas on how to help. I also like the Predictor and was very happy to see that I had set myself for attainable goals in the right timeframe!

  6. Very nice! Thank you!

  7. I had only one #ref response and it was in this field
    and your BMI is.
    I like this. It is easy to use and the calorie information appears to be correct it agrees with what MFP says my goal calories here 1259 MFP says 1280. I like the idea of the zig zag diet I have been varying my calorie intake not on purpose but I don’t beat myself up if I go over the 1280.


      Thanks for the feedback! I fixed the #ref problem so everything should work fine now. If you find this calculator useful please share it!

      • Thank you. Is there a way to print or save today’s results for comparison to progress?


          Hmm, I hadn’t thought of that! Could you bookmark and come back in a week or so? I will see what I can do, once I have the metric version up and running.

  8. This is great- simple & very easy to understand/follow. Thanks so much!

  9. This is great thank you! I love the zig zag option. I also agree a way to save this would be great, but you’ve done so much already.
    Coming from someone who doesn’t understand computer programming at all, you pretty much rock in my book. :)

  10. Yes thank you very much


      No problem :)

    • BTW I put this in my response on MFP but want to add here. I have quite a bit of computer experience if you need a person to test something I am willing to be a guinea pig. I do not design web applications or anything like that so not a competitor.

  11. AMAZING. Bookmarked!

  12. In the weight loss predictor section, it says that for me, based on my CURRENT weight, if I eat 1900 calories I would lose 130 pounds in one year – 365 days.
    Does your formula take into account that lower calories will be needed to lose the same amount of weight every week? In other words, will I not need to lower the 1900 as I get lighter? or is that worked into your formula?

  13. I wanted to thank you so much for this calculator.
    I’m currently 180lbs (started 220,) 5’5″ woman and when I saw that that was considered obese I thought “no way, I have been obese, this is not it. I’m just overweight.”
    When I told someone my goal weight was 160lbs (I felt healthy and energetic at that weight) they blatantly said “thats still fat.”
    Then I found this calculator that gives you something to calculate frame size. Holy moly, my wrist is 7 inches and that apparently makes me a large frame, and 160lbs is in my healthy range.
    I knew in the back of my head 160 was perfect for me, but having it still considered fat made me upset. A size 8 (which was my pant size at 160) is not friggin fat! Thank you!

  14. Thank you so much! I have been very overweight for a long time and my Doctor and I agreed that a more aggressive weight loss than 2lbs a week would be a good idea. (till I get down to more manageable a number) and this is the only website that lets you calculate more than 2lbs a week loss to figure your calorie intake! It’s helped me lose 80lbs in 4 months!!! Thank you


      Hi Jon,

      That’s wonderful, congratulations on the weight loss! I’m glad you found the calculator useful.

  15. Hello and thank you for creating this calculator. I have a question: Based on the guide, would working out 1-2 hours per day be considered moderate?(6-7 days per week)


      You’re welcome! It probably depends on the intensity of your exercise (e.g. 2 hours of running fast will burn a lot more calories than 2 hours walking) but on the whole I’d say that’s ‘very active’. If you’re not sure between the two actviity levels, you could always calculate both and then average them to meet halfway :) Thanks for using the calculator, if you’ve found it useful please share it!

  16. Hey! I love your calculator tool but I am having trouble deciding whether I fall in to the ‘moderately active’ category or the ‘very active category’ . I work out six days a week burning atleast 500 calories each time I complete a workout and on my “off” day I usually take my dogs for a long(about 4 miles) and leisurely stroll. I am also a college student and although I am not really active in class, I do walk between my classes which equates to about 2.5 miles of walking a day for each of the four days a week I have
    class. I’m not active at home or a work. Any insight would be very helpful!


      Hi Katie! Glad you like the calculator, please share it! I’d say that was very active, but if you’re not sure, one thing you could do is just select ‘sedentary’ and then track how many calories you burn through exercise – then add that on to your BMR.

  17. Finally a calculator that just gives you the information you want without cutting off at a certain calorie number. I love playing around on here. Its motivating for weightloss when you can see exactly how many calories you can eat and lose weight.

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