How we calculate your daily energy needs
PlentyPlate turns a few honest inputs, your age, height, weight, and how you move through a normal day, into a personalized daily energy target and a real plate: three meals, two snacks, and a treat you planned for.
The Mifflin-St Jeor equation
Your body burns energy around the clock. Breathing, circulation, keeping warm, repairing tissue. The calories that work requires while you rest is your basal metabolic rate, or BMR. For most people it is the largest share of everything they burn in a day.
We estimate BMR with the Mifflin-St Jeor equation, the formula the American Dietetic Association found most accurate for the general population and the modern standard in clinical practice. It uses your weight, height, age, and sex:
- Men: BMR = 10 × weight (kg) + 6.25 × height (cm) − 5 × age + 5
- Women: BMR = 10 × weight (kg) + 6.25 × height (cm) − 5 × age − 161
You enter pounds and inches. We convert to metric behind the scenes and round to a whole number.
Activity multipliers and TDEE
Daily life adds to that baseline. Walking to the car, standing at the stove, chasing kids, working a shift. Multiplying BMR by an activity factor gives your total daily energy expenditure, or TDEE: a realistic estimate of what a full, ordinary day burns.
PlentyPlate asks about your everyday movement, meaning your job and routine rather than your workouts. Planned exercise gets counted separately as one of your levers, so the same effort is never counted twice.
| Everyday movement | What it looks like | Multiplier |
|---|---|---|
| Mostly sitting | Desk job, drive everywhere, little walking | 1.2 |
| Lightly moving | Some walking and standing through the day | 1.3 |
| On your feet a lot | Teacher, retail, parenting young kids | 1.4 |
| Active job | Nurse, server, mail carrier, moving all shift | 1.5 |
| Physical labor | Construction, warehouse, farm work | 1.6 |
Your goal then shifts the target gently. A modest daily adjustment of 250 to 500 calories supports steady fat loss or lean gain, and we hold every target above a safe floor of 1,200 calories for women and 1,500 for men.
Turning a number into a plate
A daily target becomes useful when it looks like food. PlentyPlate spreads yours across a full day of eating: breakfast, lunch, dinner, two snacks, and a treat.
- Protein leads. We aim for about 1 gram per pound of body weight, which keeps you full and protects muscle.
- Fat gets a healthy share. Around a quarter of your calories, with a floor that supports hormones and energy.
- Carbs fill the rest. Fuel for your brain, your workouts, and your day.
- The treat is built in. Roughly 10 percent of your day, between 120 and 300 calories, is reserved for something you genuinely enjoy. Dessert has a seat at the table from the start.
The result is a day of plenty that happens to land on your number.
Where estimates fall short
Good formulas describe averages, and you are an individual. Real metabolisms commonly vary 10 percent or more from any equation. Muscle mass, genetics, medications, thyroid conditions, pregnancy, and breastfeeding all change your true needs in ways a calculator cannot see.
Treat your PlentyPlate numbers as a well-informed starting point. Live with them for a few weeks, watch how your body and energy respond, and adjust.
Everything on this site is general education. For medical needs, an eating disorder history, or a plan tailored to your health, please work with a registered dietitian or your doctor. They can do what a formula never will: know you.
Your numbers take about a minute to run, and the plate they build is yours to keep.
Build your plate