The complete guide
The calorie budget planner estimates how many calories you use in a day and splits that number across your meals. It helps you see how much room a restaurant meal can take up, so you can plan an order that fits your day instead of guessing.
Enter your sex, age, weight, height, activity level and number of meals. The planner does the math instantly in your browser and does not store anything you enter. This guide explains the formula, the activity levels and how to use the result with restaurant menus.
How the estimate works
The planner first estimates your resting energy needs, the calories your body uses at rest, with the Mifflin-St Jeor equation. This widely used formula takes your weight in kilograms, height in centimeters, age and sex. The result is then multiplied by an activity factor to estimate the calories you use on a typical day.
Choosing an activity level
Pick the level that best matches a normal week. Many people overestimate their activity, so if you are unsure, choose the lower option and adjust later.
- Sedentary (1.2): mostly sitting, little exercise
- Lightly active (1.375): light exercise one to three days a week
- Moderately active (1.55): moderate exercise three to five days a week
- Very active (1.725): hard exercise six to seven days a week
Splitting calories across meals
The planner divides your daily estimate by the number of meals you choose. With three meals, each gets about a third. In practice, many people eat a lighter breakfast and a larger dinner, so treat the split as a starting point. If you snack, set aside some calories for snacks and spread the rest across meals.
Fitting a restaurant meal into your budget
Once you know your per-meal number, open the nutrition calculator and build your order. If the total is higher than your budget, try a smaller size, a grilled option, a lighter side or a zero-calorie drink. If one meal is larger, you can balance it with lighter meals the rest of the day.
Using US units
The planner currently takes weight in kilograms and height in centimeters. To convert, multiply pounds by 0.4536 to get kilograms, and multiply inches by 2.54 to get centimeters. For example, 160 pounds is about 72.6 kg, and 5 feet 7 inches, or 67 inches, is about 170 cm.
Limits of the estimate
Any formula is an estimate. Your actual needs depend on body composition, health conditions, medications, sleep and daily movement. The Mifflin-St Jeor equation may be less accurate for athletes, older adults and people with very high or low muscle mass. Pregnant or breastfeeding people and anyone managing a medical condition should get advice from a doctor or registered dietitian.
Adjusting over time
Use the estimate for two to three weeks and watch how your weight and energy respond. If your weight changes in a direction you did not intend, adjust your daily target in small steps. Re-run the planner if your weight or activity level changes noticeably.
A worked example
Take a 35-year-old woman who weighs 68 kg (about 150 pounds), stands 165 cm tall (about 5 feet 5 inches) and is lightly active. The Mifflin-St Jeor equation gives a resting estimate of about 1,400 calories. Multiplying by the lightly active factor of 1.375 gives roughly 1,920 calories a day. Split across three meals, that is about 640 calories per meal.
She can then open the nutrition calculator and look for a restaurant meal around that number, or plan a larger dinner and lighter breakfast and lunch.
Calories are not the whole story
Hitting a calorie number is only part of eating well. Protein helps with fullness and muscle, fiber from vegetables and whole grains supports digestion, and keeping sodium in check matters for blood pressure. When you use the planner with restaurant menus, look at protein and sodium in the calculator as well as calories. A meal that fits your calories but uses most of a day's sodium may be worth adjusting.
Using the planner with restaurant meals
Restaurant meals are often larger than home cooked ones, so it helps to plan around them. On a day you know you will eat out, check the restaurant's menu in advance, pick an order that fits your per-meal budget and adjust the other meals around it. If you eat out often, look for chains with grilled options, smaller sizes and lighter sides, and keep a few favorite orders that you know fit your target.
Planning ahead takes only a few minutes and removes much of the guesswork at the counter.
Who should not rely on the estimate
Anyone with a medical condition that affects weight, appetite or metabolism, anyone who is pregnant or breastfeeding, and anyone with a history of disordered eating should rely on a qualified professional rather than a general calculator. The planner is meant for general planning only.
How the calorie planner estimates your daily target
The planner uses your age, sex, height, weight and activity level to estimate how many calories your body uses in a typical day. It first estimates resting energy, which is what your body uses to keep running, then multiplies that by an activity factor that reflects how much you move. The result is a general maintenance estimate, not a measurement.
Your goal then adjusts the number. Maintaining keeps the estimate as it is, eating lighter subtracts a moderate amount and gaining adds some. The planner avoids extreme adjustments, because very large cuts are hard to sustain and are not something a general online tool should suggest. If you have a medical condition, are pregnant or are working with a clinician, follow their guidance instead.
Results only appear after you press Calculate, and changing any input hides them until you calculate again. That keeps the number on screen matched to the inputs you actually entered.
Splitting your day across meals
A daily target is easier to use when it is broken into meals. The planner shows a simple split across breakfast, lunch, dinner and snacks so you can see roughly how much room each meal has. If you usually skip breakfast or eat a large dinner, shift the numbers to match your routine; the total for the day is what matters most.
Restaurant meals often take a large share of a day's calories. Knowing your lunch or dinner budget before you order makes it easier to choose a size, decide on a side or skip a sugary drink without feeling like you are guessing.
Using the planner with the restaurant calculators
The planner and the restaurant calculators are designed to work together. Find your daily estimate here, then open the calculator for the restaurant you are visiting. In the goal step, choose the same goal and the meal you are planning, and the calculator will compare your order with that share of the day.
Build the order you would normally get, press Calculate and look at the budget bar. If you are over, try the lighter swaps the calculator suggests, change a sauce, pick a smaller size or swap a side. If you are well under and hungry, add protein first, because it tends to be the most filling way to use the extra room.
Activity levels explained
Choosing the right activity level makes the biggest difference to the estimate. Most people overestimate how active they are, so if you are unsure, pick the lower option and adjust after a few weeks.
- Sedentary: desk work and little planned exercise
- Lightly active: light exercise one to three days a week
- Moderately active: exercise three to five days a week
- Very active: hard exercise six or seven days a week
- Extra active: physical job plus regular training
Why your real needs may differ
Equations like the one the planner uses are based on averages across many people. Your real needs can be higher or lower because of muscle mass, genetics, sleep, stress, medications and day-to-day changes in activity. Treat the result as a starting point, track how your weight and energy respond over a few weeks and adjust from there.
Restaurant nutrition also carries some uncertainty. Portions vary between locations and staff, and custom portions in our calculators are labeled Estimate. Small differences on single meals tend to even out, so focus on patterns across the week rather than any one number.
Your planner inputs stay in your browser. We do not store your age, weight or height, and the planner does not need an account. You can read more in our Privacy Policy.
Examples of how people use their target
Someone eating lighter with a daily estimate of around 1,800 calories might plan roughly 450 for breakfast, 550 for lunch, 600 for dinner and keep about 200 for a snack. Before a restaurant lunch, they open the calculator, choose the lighter goal and lunch, and build an order that lands near 550, perhaps by choosing a bowl over a burrito or a smaller drink.
Someone focused on protein might keep the same calorie target but sort the restaurant menu by protein and use the protein per calorie lists on each calculator page. They often find that grilled proteins, double meat on a bowl or a salad with chicken gives far more protein than a larger fried item with similar calories.
Someone maintaining weight on a busy travel day might simply check that one large restaurant meal leaves enough room for a lighter breakfast and snack. The point is not perfection on every meal; it is having a rough plan so restaurant choices fit your week.
These examples use round numbers for illustration only. Your own estimate depends on your inputs, and the restaurant totals depend on the sourced or estimated figures shown in each calculator.
Common mistakes to avoid
The most common mistake is counting only the main item at a restaurant and forgetting the drink, side, sauce or dessert. Those extras can add several hundred calories, so include them when you check a meal against your budget.
Another is choosing an activity level based on your most active week rather than a typical one. A third is changing the target every few days. Weight naturally moves up and down with water and food volume, so give any new target a few weeks before deciding it is wrong. Finally, remember that calories are only one part of a meal; protein, fiber and sodium matter too, and the restaurant calculators show those alongside calories.
Frequently asked questions
Is the planner free?
Yes, and it needs no account.
Does it store my details?
No. Everything stays in your browser and clears when you reload.
Why might the estimate be off?
Formulas use averages. Muscle mass, health and activity vary a lot between people.
Can it give me a weight loss plan?
No. It gives a general maintenance estimate. Talk to a professional for a personal plan.
What if I eat more than three meals?
Choose the number of meals or eating occasions you usually have, and the planner splits your total evenly.
Does the planner work for teenagers?
The equation was developed for adults. Teenagers are still growing and should get guidance from a doctor or registered dietitian.
How often should I recalculate?
Recalculate whenever your weight changes noticeably or your activity level changes for more than a few weeks.
Does the planner account for exercise I log?
No. It uses the general activity level you choose rather than specific workouts, so pick the level that matches a normal week.
How often should I recalculate my target?
Recalculate when your weight changes noticeably, your activity level changes or a few weeks pass without the results you expected.
Does the planner work for children?
No. The planner is designed for adults. Children and teenagers have different needs, so speak with a pediatrician or registered dietitian.
Is a lower target always better for weight loss?
No. Very low intakes are hard to sustain and can leave you short on nutrients. The planner uses a moderate adjustment, and a clinician can help if you need a specific plan.
The takeaway
Get a general daily calorie estimate, split it across your meals, then use the nutrition calculator to build restaurant orders that fit.