🤰
Pregnancy Calorie Calculator 2026
Trimester-by-trimester calorie additions and IOM weight-gain ranges — general information only.
A pregnancy calorie calculator is a tool that adds a trimester-specific calorie allowance to your usual daily intake, following guidance from the Institute of Medicine (IOM): no extra calories in the first trimester, about +340 kcal per day in the second and about +452 kcal per day in the third. This page provides general information only and is not medical advice.
Start Calculating ↓Pregnancy calorie estimate
Recommended total weight gain for your BMI category (IOM): 11.5–16 kg
About the Pregnancy Calorie Calculator
Enter your usual (pre-pregnancy) daily calories and choose your trimester and pre-pregnancy BMI category to see a target and the IOM recommended total weight-gain range for that category. Always confirm your personal needs with your midwife, obstetrician or doctor, especially with twins, diabetes or any complications.
Pregnancy Calorie Calculator: Key Facts to Know
- ✓ IOM additions: +0 kcal/day in trimester 1, +340 in trimester 2, +452 in trimester 3.
- ✓ Recommended total gain — underweight: 12.5–18 kg; normal weight: 11.5–16 kg; overweight: 7–11.5 kg; obese: 5–9 kg.
- ✓ You do not need to 'eat for two' — the additions equal roughly a snack or small meal.
- ✓ Focus on nutrient density: folate, iron, calcium, iodine and protein matter alongside calories.
- ✓ General information only — not medical advice. Follow your own care team's guidance.
Results from the Pregnancy Calorie Calculator are estimates for general educational use on Smoothie Nutrition Calculator. They are not medical or dietetic advice — for personal medical nutrition questions, including pregnancy, diabetes and clinical nutrition such as TPN, always work with your doctor or a registered dietitian.
Frequently Asked Questions
Per IOM guidance, about 0 extra kcal per day in the first trimester, +340 in the second and +452 in the third, on top of your usual needs.
Pregnancy Calorie Calculator Guides & Articles
All 4 of our guides for this calculator — every one built on the same data as the tool above.
Pregnancy Calorie Calculator 2026
A pregnancy calorie calculator is a tool that adds a trimester-specific calorie allowance to your usual daily intake, following guidance from the Institute of Medicine (IOM): no extra calories in the first trimester, about +340 kcal per day in the second and about +452 kcal per day in the third. This page provides general information only and is not medical advice.
Read guide →
🤰Pregnancy Calorie Calculator 2026 | Tips Mistakes
Most wrong results from the Pregnancy Calorie Calculator come from input mistakes, not the maths. Here are the five that matter most — and the fix for each.
Read guide →
🤰Pregnancy Calorie Calculator 2026 | Deep Dive
Beyond the basics: the reference values, assumptions and limits behind the Pregnancy Calorie Calculator, and how dietitians sanity-check its results.
Read guide →
🤰Pregnancy Calorie Calculator 2026 | Worked Examples
Numbers land differently in context. Three everyday scenarios run through the Pregnancy Calorie Calculator, with the input that mattered most in each.
Read guide →
More Nutrition Calculators
Every calculator on Smoothie Nutrition Calculator works the same way — pick from the dropdowns and see live totals.