How to calculate calorie deficit for weight loss
To calculate your calorie deficit for weight loss, follow these two basic steps:
Step 1: Calculate your maintenance calories
The first step to calculating your calorie deficit is to find out how many calories you need in a day to maintain your weight, also called maintenance calories.
Multiply your weight by 15
A rough estimate for calculating maintenance calories for a moderately active person is multiplying body weight in pounds by 15 (you roughly need 15 calories per pound of your body weight to maintain your current weight).
Moderately active means engaging in physical activity equivalent to walking about 1.5-3 miles a day at 3-4 miles an hour, in addition to daily living activities.
So, if you weigh 150 pounds, your maintenance calories will be 150 × 15 = 2,250 calories.
Figure out your BMR and TDEE
Another way to calculate your maintenance calories is knowing your basal metabolic rate (BMR) and total daily energy expenditure (TDEE).
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BMR is the number of calories needed to maintain basic life-sustaining functions, such as breathing, maintaining blood pressure, and digesting food. One popular formula for calculating BMR is the Harris Benedict formula. According to this formula:
Male BMR formula = 66 + (6.23 × weight in pounds) + (12.7 × height in inches) − (6.8 × age in years)
Female BMR formula = 655 + (4.3 x weight in pounds) + (4.7 x height in inches) – (4.7 x age in years)
BMR chart shows a male (5' 7" 170 lbs. 43 years old) and a female (5' 3" 130 lbs. and 36 years old)
Next, you need to calculate your TDEE, which is the total number of calories you burn including your BMR. Your TDEE equals your maintenance calories. To calculate your TDEE:
TDEE = 1.2 × BMR if you have a sedentary lifestyle (little to no exercise and work a desk job)
TDEE = 1.375 × BMR if you have a lightly activ
e lifestyle (light exercise 1-3 days per week)
TDEE = 1.55 × BMR if you have a moderately active lifestyle (moderate exercise 3-5 days per week)
TDEE = 1.725 × BMR if you have a very active lifestyle (heavy exercise 6-7 day per week)
TDEE = 1.9 × BMR if you have an extremely active lifestyle (strenuous training 2 times a day)
Based on the above TDEE formula, a male (5’ 7” and 155 lbs.) and a female (5’ 4” and 110 lbs.) have a sedentary lifestyle as shown in the below chart.
TDEE chart shows a male (5’ 7” and 155 lbs.) and a female (5’ 4” and 110 lbs.) sedentary lifestyle
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Step 2: Calculate your calorie deficit
The American Heart Association (AHA) suggests knowing how many calories you should be eating and drinking to maintain your weight. Nutrition information on food labels is usually based on a 2,000 calorie per day diet and individuals need fewer or more calories depending on age, gender, and activity levels.
They suggest eating 500 calories less than your maintenance calories a day to lose 1 pound of weight a week.
So, if your TDEE is 2,000 calories, eating 1,500 calories a day for 7 days may help you achieve a weight loss of 1 pound a week as long as you keep your daily activities consistent. Increased physical activity means more weight loss. The AHA recommends at least 150 minutes of moderate physical activity or 75 minutes of vigorous physical activity (or an equal combination of both) each week.
If you are a beginner, you can start with a deficit of 200 to 300 calories initially and then build up to eating 500 to 750 calories under your maintenance calories.
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