Advanced Maintenance Calculator
Enter your details, choose a formula, and adjust activity settings.
Formula Used
Mifflin St Jeor: Men: 10W + 6.25H - 5A + 5. Women: 10W + 6.25H - 5A - 161.
Revised Harris Benedict: It uses sex specific constants with weight, height, and age.
Katch McArdle: BMR = 370 + 21.6 × lean body mass in kilograms.
Total estimate: Maintenance = BMR × activity + exercise + adjustment. TEF is optional.
W means weight in kilograms. H means height in centimeters. A means age in years. Exercise calories use MET × 3.5 × weight ÷ 200 × minutes.
How to Use This Calculator
- Choose metric or pound based inputs.
- Enter sex, age, weight, and height.
- Select the formula that suits your data.
- Choose the nearest daily activity level.
- Add planned exercise minutes when needed.
- Set protein and fat options for macros.
- Press the calculate button to see results.
Compare your target with weekly weight averages. Adjust slowly when your trend moves.
Maintenance Calorie Guide
Maintenance calories show your daily energy balance point. At this level, body weight should stay stable. The number is not fixed forever. It changes with age, movement, training, sleep, and body size. This calculator gives a practical estimate. It combines basal needs with daily activity. It can also add planned exercise. That helps active users avoid underestimating intake. It is useful for athletes, students, office workers, and beginners.
What The Estimate Includes
The tool starts with your resting energy use. This is often called BMR. BMR supports breathing, circulation, cells, and organ work. Next, the calculator applies an activity level. That covers normal movement across the day. You can also add exercise minutes and intensity. The exercise option uses MET based math. A custom adjustment can correct unusual routines. You may include a thermic effect value too. That option estimates digestion cost. Small differences are normal between formulas.
Choosing The Best Formula
Mifflin St Jeor is a strong general choice. It works well for many adults. Revised Harris Benedict can be useful for comparison. Katch McArdle uses lean body mass. It needs a realistic body fat estimate. If body fat is unknown, choose another formula. Use the same formula for repeated checks. That makes progress easier to compare. A steady trend matters more than one result.
Using The Result Wisely
Your output is a starting target, not a rule. Track body weight for two to four weeks. Use the same scale conditions. Morning weight gives cleaner data. Compare weekly averages, not single days. If weight rises, lower intake slightly. If weight falls, raise intake slightly. Adjust by small amounts first. A change of 100 calories often helps. Larger changes can hide real trends. Training changes may need new calculations.
Macros And Daily Planning
The calculator also builds protein, fat, and carbohydrate targets. Protein is based on body weight. Fat is based on calorie share. Carbohydrates fill the remaining energy. These values are planning aids. They do not replace personal nutrition advice. Choose foods you can repeat consistently. Include fiber, water, and micronutrient rich meals. Keep meal timing simple. Consistency makes maintenance easier than perfection. Review your target when activity or weight changes.
Common Reasons Estimates Change
Maintenance can shift after diet phases. It may drop during low movement weeks. It may rise during hard training blocks. Weather, job demands, and step count also matter. Water weight can hide these shifts. Salt, stress, and sore muscles affect scale readings. That is why averages are better. The calculator lets you repeat inputs often. You can test activity levels quickly. You can compare formulas without manual math.
Practical Tracking Tips
Start with the calculated target. Eat near that number several days. Keep protein steady each day. Keep weekend intake visible too. Hidden snacks can change averages fast. Record steps when possible. Add exercise only when it is planned. Do not add the same workout twice. Review weight trends after fourteen days. Then adjust with calm, small changes. Use the target carefully, then refine through weekly averages.
Example Data Table
| Profile | Formula | Activity | Estimated Target |
|---|---|---|---|
| 70 kg, 175 cm, age 30 | Mifflin St Jeor | Moderate | About 2,600 calories |
| 60 kg, 165 cm, age 28 | Mifflin St Jeor | Light | About 1,950 calories |
| 85 kg, 180 cm, age 40 | Revised Harris Benedict | Very active | About 3,300 calories |
FAQs
What are maintenance calories?
Maintenance calories are the daily calories that keep weight stable. They cover resting needs, normal movement, exercise, and digestion. The result is an estimate, not a fixed law.
Can I use pounds and inches?
Yes. Select the pounds and inches option. The calculator converts those values internally. Results still use calorie based formulas that need metric measurements.
Which formula should I choose?
Mifflin St Jeor is a good default. Revised Harris Benedict is useful for comparison. Katch McArdle works best when you know body fat percentage.
What activity level should I select?
Choose the level that matches your normal week. Do not pick your hardest day. A realistic weekly average gives a better maintenance target.
Should I add exercise minutes?
Add exercise when it is not already reflected in your activity level. Avoid double counting. Planned workouts can increase the target quickly.
What is thermic effect?
Thermic effect is energy used during digestion. Many people estimate it near ten percent. You can turn it off for a simpler result.
Why is my result different elsewhere?
Tools may use different formulas, multipliers, and rounding. Activity level choices also vary. Use one method consistently for better tracking.
How often should I recalculate?
Recalculate after weight changes, training changes, or routine changes. Many users check every month. Stable routines need fewer updates.
Can this help with weight loss?
Yes. First estimate maintenance. Then create a sensible deficit. Small changes are easier to track and maintain over time.
Do I need body fat percentage?
No. It is only required for Katch McArdle. Use Mifflin St Jeor or Revised Harris Benedict when body fat is unknown.
Are the macro targets exact?
No. They are planning targets. Protein uses body weight. Fat uses calorie share. Carbohydrates fill the remaining calories.