BMR (basal metabolic rate) is the estimated energy your body uses to stay alive at complete rest — breathing, circulation, cell repair and organ function — over 24 hours, before any movement or exercise is counted.

What are daily calorie needs or TDEE?

Total daily energy expenditure (TDEE) is your BMR plus the energy used by everything else you do: walking, working, exercising and digesting food. This calculator estimates it by multiplying BMR by an activity factor.

Which formula does this calculator use?

It uses the Mifflin-St Jeor equation: 10 × weight in kg + 6.25 × height in cm − 5 × age, then +5 for males or −161 for females. The result is multiplied by an activity factor between 1.2 and 1.9.

How much does the activity level change the result?

A lot. Moving from sedentary (1.2) to very active (1.725) increases the estimate by more than 40% for the same person, which is why choosing an honest activity level matters more than fine-tuning your weight entry.

Is this a diet plan or medical advice?

No. The figures are estimates from a general formula and are for information only. They do not diagnose any condition, prescribe a diet or account for your personal medical situation. Consult a qualified professional for personal guidance.

Why do my results differ from another calculator?

Different calculators use different equations (Mifflin-St Jeor, Harris-Benedict, Katch-McArdle) and slightly different activity factors, so estimates commonly vary by a few hundred calories.

Can I use this if I am very muscular?

The equation uses only age, sex, height and weight, so it cannot see body composition. People with a high muscle mass often use more energy than the estimate suggests, and formulas based on lean body mass suit them better.

Why does the calculator show a message instead of a number?

If a box is empty, zero, negative or outside a realistic adult range for age, height or weight, the calculator asks you to check your entries instead of showing an impossible result.

Calorie Calculator

Estimate your resting metabolic rate and daily calorie needs from your age, sex, height, weight and activity level.

Under 30 seconds

Updated 23 Sept 2026

Estimated daily calorie needs

2,224 kcal/day

Estimated energy used per day at your selected activity level — an estimate, not a prescription.

Estimated BMR: 1,618 kcal/day
Activity level: Lightly active — light exercise 1–3 days a week

Activity multiplier

× 1.375

Height used

170 cm

Weight used

70 kg

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Calorie needs shown here are estimates based on a standard formula. Individual requirements vary with body composition, health conditions, medication and daily routine, and these figures are not medical or dietary advice.

This calorie calculator estimates your BMR (the energy your body uses at rest) with the Mifflin-St Jeor formula, then multiplies it by a standard activity factor to estimate your total daily energy expenditure — your daily calorie needs. Both figures are estimates, not a diet plan or medical advice.

Visual breakdown

A visual view of your calculation.

Interactive charts arrive here soon.

Smart Insights

Generated from the numbers you entered — no guesswork.

Your body is estimated to use about 1,618 kcal/day at complete rest, before any movement or exercise is added.
With the “Lightly active — light exercise 1–3 days a week” multiplier of 1.375, estimated total daily energy use is about 2,224 kcal/day.
Eating close to this figure tends to keep weight stable over time, while a sustained surplus or deficit shifts it — but the real number varies from person to person.
Calorie needs shown here are estimates based on a standard formula. Individual requirements vary with body composition, health conditions, medication and daily routine, and these figures are not medical or dietary advice.

What is the Calorie Calculator?

What the tool does, who it is for and what it cannot tell you.

A calorie calculator estimates how much food energy your body uses in a day. It first estimates your basal metabolic rate (BMR) — the energy needed to keep your body running at complete rest — and then scales it up for how active you are.

The result is an estimate produced by a standard population formula. It cannot see your body composition, hormones, health conditions, medication or the true intensity of your daily activity, so treat it as a starting reference rather than a target prescribed for you.

How does the Calorie Calculator work?

Each step the calculator runs, in plain language.

1
Enter your details
Age, sex, height and weight are used by the Mifflin-St Jeor equation; units are converted for you.
2
Estimate BMR
The formula estimates the calories your body would use at rest over 24 hours.
3
Apply your activity level
BMR is multiplied by a standard factor from 1.2 (sedentary) to 1.9 (extra active).
4
Read the daily estimate
The product is your estimated total daily energy expenditure, often called TDEE or daily calorie needs.

What to enter in each field

The exact figure each input expects, so the result means what you think it means.

Units: Choose the combination matching your measurements. Height boxes for units you are not using are ignored.
Sex: The equation uses a different constant for males and females (+5 and −161).
Age: Your age in completed years. The equation is intended for adults.
Weight: Body weight in kilograms or pounds, matching the unit choice. Decimals are allowed.
Height: Centimetres, or feet and inches, depending on the units selected.
Activity level: Pick the description closest to a typical week, including work and exercise. Choosing a higher level raises the estimate noticeably.

Calorie Calculator formula

The exact maths behind every number on this page.

BMR (Mifflin-St Jeor) = 10 × weight (kg) + 6.25 × height (cm) − 5 × age + s, where s = +5 for males and −161 for females. Daily calorie needs = BMR × activity multiplier

weight (kg): Body weight in kilograms (pounds converted at 1 lb = 0.45359237 kg)
height (cm): Height in centimetres (1 inch = 2.54 cm)
age: Age in completed years
activity multiplier: 1.2 sedentary, 1.375 lightly active, 1.55 moderately active, 1.725 very active, 1.9 extra active

Mifflin-St Jeor is a widely used standard equation for estimating resting energy use in adults. The activity multipliers are conventional round figures, not measured values for any individual.

Calorie Calculator calculation example

Hypothetical example: a 30-year-old male, 170 cm tall, 70 kg, lightly active (multiplier 1.375).

110 × weight10 × 70 = 700
26.25 × height6.25 × 170 = 1,062.5
3−5 × age−5 × 30 = −150
4Male constant+5
5BMR700 + 1,062.5 − 150 + 5 ≈ 1,618 kcal/day
6Daily calorie needs1,618 × 1.375 ≈ 2,224 kcal/day

The estimate is roughly 1,618 kcal/day at rest and about 2,224 kcal/day in total. All figures here are hypothetical and rounded.

Important assumptions

What this calculation includes, and what it leaves out.

Uses the Mifflin-St Jeor equation for BMR, a standard estimate for adults.
Applies conventional activity multipliers: 1.2, 1.375, 1.55, 1.725 and 1.9.
Unit conversions use 1 inch = 2.54 cm and 1 lb = 0.45359237 kg.
Results are rounded to whole calories and are not adjusted for pregnancy, illness, medication or athletic body composition.
Calorie needs shown here are estimates based on a standard formula. Individual requirements vary with body composition, health conditions, medication and daily routine, and these figures are not medical or dietary advice.

Financial tips

Practical guidance to act on your result.

If you are unsure between two activity levels, note both estimates and treat the range as the realistic answer.
Weigh yourself consistently — same time of day, similar conditions — if you want to compare estimates over time.
Activity multipliers are broad averages; two people with identical inputs can genuinely differ by several hundred calories a day.
Track how your weight actually responds over a few weeks; real-world feedback beats any formula.
Speak to a qualified doctor or registered dietitian before making significant changes to how you eat or train.

Frequently asked questions

Short, direct answers to the questions we hear most.

Keep planning with tools that pair well with this one.

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Estimate the calories your body uses at complete rest.

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Your body mass index and its standard adult category.

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Estimate how much water you may need each day.

Disclaimer

CalPaisa calculators are for general information and planning only. Results are estimates based on the values you enter and standard formulas, and may differ from the figures your bank, employer, or tax authority applies. Nothing here is investment, tax, or legal advice. Please confirm important decisions with a qualified professional. Read our financial disclaimer, learn how CalPaisa works, or tell us about a calculation you think is wrong.

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