This calculator is intended for adults aged 18 and above.
Activity multipliers are estimates. Actual energy needs can vary significantly between individuals.
The goal adjustment is a planning estimate, not a prescribed diet. Large deficits are intentionally not offered.
Disclaimer: Estimate only, not medical or nutrition advice; pregnancy, breastfeeding, medical conditions, medications, growth, athletic training and other factors can substantially change calorie needs.
What Is a Calorie Calculator Singapore?
A Calorie Calculator Singapore estimates how many calories an adult may need each day.
It first estimates your Basal Metabolic Rate, or BMR. This is the energy your body uses for basic functions while at rest.
The calculator then considers your activity level to estimate maintenance calories. Finally, it adds or subtracts calories according to your selected weight goal.
The results include:
- estimated daily calorie target;
- estimated BMR;
- estimated maintenance calories or TDEE;
- activity multiplier used; and
- goal adjustment applied.
The results are estimates. Actual calorie needs can change because of body composition, health, medication, pregnancy, breastfeeding and training demands.
How to Use the Calculator
1. Select the Sex Used for the BMR Formula
Choose male or female according to the formula you want the calculator to use.
The Mifflin–St Jeor equation applies a different final number to each option. The calculator does not assess gender identity, hormones or individual body composition.
2. Enter Your Age
Enter your age in complete years.
The accepted range is 18 to 100. This calculator is not intended for children or teenagers under 18 because growth can significantly change energy needs.
For a separate height-to-weight screening calculation, use the BMI Calculator Singapore. BMI does not calculate daily calorie intake, but it can provide additional weight-related context.
3. Enter Your Height and Weight
Enter height in centimetres and weight in kilograms.
The calculator accepts heights from 100 to 250 cm and weights from 30 to 300 kg. Use recent measurements instead of rough guesses where possible.
4. Choose Your Activity Level
Select the option that best reflects your normal activity:
- Sedentary: multiplier 1.2
- Lightly active: multiplier 1.375
- Moderately active: multiplier 1.55
- Very active: multiplier 1.725
- Extra active: multiplier 1.9
Choose based on your usual routine, not your most active day. Selecting an activity level that is too high can produce an unrealistic maintenance estimate.
The IPPT Calculator serves a different purpose. It calculates supported IPPT performance outcomes and does not determine calorie needs or exercise energy expenditure.
5. Select Your Goal
The available options are:
- Maintain weight: no adjustment
- Modest deficit: minus 250 kcal per day
- Moderate deficit: minus 500 kcal per day
- Modest surplus: plus 250 kcal per day
- Moderate surplus: plus 500 kcal per day
These adjustments are planning values. They are not personalised dietary prescriptions or promises of a specific weekly weight change.
Formula Used by the Calculator
The calculator uses the Mifflin–St Jeor equation.
For the male formula:
BMR = (10 × weight in kg) + (6.25 × height in cm) − (5 × age) + 5
For the female formula:
BMR = (10 × weight in kg) + (6.25 × height in cm) − (5 × age) − 161
Maintenance calories are calculated as:
TDEE = BMR × Activity multiplier
The target is then calculated as:
Daily calorie target = TDEE + Selected goal adjustment
A deficit is entered as a negative adjustment. A surplus is entered as a positive adjustment.
Calorie Calculation Example
Suppose a man enters:
- Age: 30 years
- Height: 170 cm
- Weight: 70 kg
- Activity: moderately active
- Goal: modest calorie deficit
First, the calculator estimates BMR:
BMR = (10 × 70) + (6.25 × 170) − (5 × 30) + 5
BMR = 700 + 1,062.5 − 150 + 5 = 1,617.5 kcal
The calculator rounds this to approximately 1,618 kcal per day.
The moderately active multiplier is 1.55:
TDEE = 1,617.5 × 1.55 = 2,507.1 kcal
Estimated maintenance is therefore approximately 2,507 kcal per day.
For a modest 250-calorie deficit:
Daily target = 2,507 − 250 = 2,257 kcal per day
This remains an estimate. The person’s real energy use and food intake may differ.
Singapore Calorie Guidance
Average calorie figures cannot represent every person. Singapore’s HealthHub gives general average figures of 2,200 Calories for males and 1,800 for females while explaining that individual requirements depend on age, sex, height, weight and activity.
This calculator personalises the estimate using those individual inputs. However, it cannot account for every medical, nutritional or lifestyle factor.
You can find other health and planning tools on the Calculator Singapores homepage. Each calculator answers a different question and should be interpreted separately.
When This Calculator Should Not Be Used Alone
Pregnancy and breastfeeding can substantially change nutritional needs. The EDD Calculator Singapore estimates pregnancy dates, but it does not calculate the additional energy or nutrients required during pregnancy.
Seek personalised advice before changing calorie intake if you:
- are pregnant or breastfeeding;
- are under 18;
- have diabetes, kidney disease or another medical condition;
- take medication that affects appetite or weight;
- have a history of disordered eating;
- train competitively;
- are recovering from illness or surgery; or
- feel weak or unwell during dietary restriction.
The calculator also cannot confirm whether a deficit or surplus is safe for you.
BMI Tools and Calorie Needs
BMI and calorie requirements are related but different measurements.
The BMI Calculator Male Singapore estimates BMI for adult men. It does not use activity level or calculate a daily food target.
The BMI Calculator for Females Singapore also estimates BMI rather than calories. Pregnancy, muscular build and other factors may make BMI less useful.
Children require age-appropriate growth assessment. The BMI Calculator for Kids is separate, while this calorie calculator intentionally rejects ages below 18.
Common Calorie Calculator Mistakes
Do not choose “extra active” only because you completed one difficult workout. Use the level that reflects your normal week.
Do not treat BMR as your complete daily allowance. BMR represents estimated resting needs, while TDEE includes the selected activity multiplier.
Enter centimetres and kilograms, not feet, inches or pounds.
Do not expect an exact weight change from a 250 or 500 kcal adjustment. Food tracking errors, metabolic adaptation and activity changes can affect the outcome.
Most importantly, do not treat the displayed result as medical or nutrition advice.
Frequently Asked Questions
Q1: What does this calculator calculate?
A: It estimates BMR, maintenance calories and a daily target after applying your activity level and selected goal.
Q2: Which BMR formula does it use?
A: It uses the Mifflin–St Jeor equation with separate male and female formula options.
Q3: Can someone under 18 use it?
A: No. The calculator accepts ages from 18 to 100 and is not designed for growing children or teenagers.
Q4: What is the difference between BMR and TDEE?
A: BMR estimates energy used at rest. TDEE multiplies BMR by the selected activity factor to estimate daily maintenance calories.
Q5: Does a 500-calorie deficit guarantee weight loss?
A: No. It is only a planning adjustment and does not guarantee a specific amount or rate of weight loss.
Q6: Can pregnant or breastfeeding users rely on it?
A: No. Their nutritional needs require personalised professional guidance that this calculator cannot provide.
Q7: Is the result a prescribed diet?
A: No. It is an estimate based on the entered values and should not replace advice from a doctor or dietitian.