Before you trust the number

Estimate maintenance calories and goal-based targets.

Use the result as a planning baseline, then adjust with actual weight change, hunger, training load, and consistency over time.

What to use it for

Mifflin-St Jeor based estimate
Maintenance and goal split
Protein range guidance included

Quick start with Calorie Calculator

1 Enter your current body data and choose the activity level that matches your average routine.
2 Read maintenance and target calories separately so you know whether you are starting from maintenance, a deficit, or a surplus.
3 Use the protein range and follow-up tracking to turn the number into an actual eating plan.

When to turn a goal into a daily intake target

When maintenance, loss, or gain should become a concrete daily calorie starting point.

Maintenance, loss, or gain should turn into a daily calorie starting point instead of staying a vague goal.
When activity level and body size need to become a realistic intake range before changing diet habits.

Which body inputs shape the estimate

Body data, activity, and goal drive the estimate most.

Sex, age, height, and weight

These define the body-size estimate used for BMR and maintenance calories.

Activity

Choose the option that best matches your average weekly movement, not your best or hardest day.

Goal

Maintain keeps calories near estimated maintenance, cut applies a deficit, and gain applies a surplus.

Which health number to read first

Read the main number first.

BMR

Estimated calories burned at rest before activity is added.

How to read it

BMR is not the number most people should eat. It is the lower-level base used to estimate maintenance.

Maintenance and target

Maintenance estimates daily needs at your activity level, while target adjusts up or down for the selected goal.

How to read it

Treat target calories as a starting prescription and check actual body-weight change over time before locking it in.

Protein range

A simple daily protein range from body weight.

How to read it

Use this as a planning guardrail when meals or macros need structure around the calorie target.

What the calorie target means

Read it as a planning target, not a guarantee.

The target is a planning estimate, not a promise of body change.
Maintenance, loss, and gain numbers are best read as starting lanes that should be adjusted once you observe actual progress.

Examples for screening and daily planning

These examples show planning use, not medical certainty.

Estimate maintenance for an active adult

Male, age 30, height 175 cm, weight 72 kg, moderate activity, goal maintain.

Input setup

Profile: Male, 30, 175 cm, 72 kg
Activity and goal: Moderate activity, maintain

Key outputs

BMR: 1,669 kcal/day
Maintenance: 2,587 kcal/day
Protein range: 101-158 g/day

How to read it

A maintenance estimate around 2,587 kcal/day is a reasonable starting point for staying weight-stable if weekly activity really is moderate.

Next thing to check

Track body weight for a couple of weeks. If weight still drifts, adjust from this baseline instead of starting over.

Set a moderate cut target

Female, age 28, height 165 cm, weight 62 kg, light activity, goal cut.

Input setup

Profile: Female, 28, 165 cm, 62 kg
Activity and goal: Light activity, cut

Key outputs

Maintenance: 1,857 kcal/day
Target: 1,407 kcal/day
Protein range: 87-136 g/day

How to read it

The cut target lands around 1,407 kcal/day, which is a planning target to observe, not a promise that progress will be linear.

Next thing to check

If hunger, training quality, or recovery become a problem, revisit activity level and protein before pushing calories lower.

Where health estimates get over-trusted

Fake precision is the main risk.

Choosing an activity level from occasional hard workouts instead of average weekly movement.
Treating the calculated target as final even when body weight and appetite say otherwise after a few weeks.
Using maintenance or target calories without checking whether the protein range still fits the goal.

What to check after the result

Check your routine, symptoms, and any medical advice next.

Track actual weight change and energy levels for at least a couple of weeks before deciding the target is wrong.
Use BMI or waist size if the next question is whether the goal itself makes sense.
Treat this as nutrition planning support, not as medical or sports-diet advice.