Pregnancy Macro Calculator
Use this pregnancy macro calculator to calculate protein, carb, and fat targets based on your calorie needs and pregnancy stage.
Updated August 12, 2026
Medical Disclaimer: This calculator provides a general estimate based on established research and is for educational purposes only, not a substitute for medical advice. Individual results can vary based on health conditions, so consult a qualified healthcare professional or registered dietitian before making significant changes to your diet, exercise, or health routine. Read our full Medical Disclaimer.
How Pregnancy Macros Are Calculated
Calories tell you how much to eat, macros tell you what to eat it as, and pregnancy shifts that second answer more than most people realize. Protein needs rise by a set amount tied to your body weight, carbohydrate has its own dedicated minimum built around fetal brain development, and fat, despite what "eating for baby's brain" messaging might suggest, doesn't actually need to increase in total quantity at all. This calculator treats each macro according to its own evidence, not one blanket percentage split.
What This Calculator Measures
This gives you a protein target in grams, a carbohydrate target in grams, and a fat range in grams, built on top of your pregnancy-adjusted calorie total. Protein is calculated first and shown with the most emphasis, since it's the macro with the clearest pregnancy-specific evidence behind it and the one most people underestimate.
The Formula
We start from your total daily calories, either calculated the same way as our Pregnancy Calorie Calculator (baseline maintenance calories plus ACOG's trimester increment) or entered directly³. Then each macro is calculated differently, on purpose:
Protein (g) = pre-pregnancy weight (kg) × 1.1
Fat (g) = 20% to 35% of total calories ÷ 9
Carbohydrate (g) = remaining calories ÷ 4, minimum 175g
Protein is calculated by body weight because that's how the evidence is actually structured¹. Fat is calculated as a percentage range because pregnancy doesn't change the underlying AMDR at all¹. Carbohydrate gets whatever's left over, with a hard floor, because its requirement is anchored to a fairly fixed physiological need, not a percentage of whatever else you're eating.
How This Calculator Computes Your Result
Enter your stats or your known calorie target and current trimester, same as the Pregnancy Calorie Calculator. We calculate protein first from your pre-pregnancy weight, then fat as a range of your total calories, then whatever calories remain become your carbohydrate target, checked against the 175g minimum. If protein and the low end of your fat range already leave less than 175g of room for carbs, we'll flag that rather than show you an unrealistically low number.
Why Protein Gets Top Billing
The IOM sets the pregnancy protein RDA at 1.1 g/kg of body weight, up from 0.8 g/kg outside pregnancy, an increase of roughly 25g/day for most people¹. That's a real, quantified shift, not a rounding error, and it's the single macro most pregnant people are likely to fall short on if they're not tracking it specifically.
Worth knowing: 1.1 g/kg is the RDA, a floor meant to cover the needs of nearly the whole population, not necessarily an optimal target. Some research and clinical practice suggest higher intakes, particularly in the second and third trimesters, may offer additional benefit, this remains an active area of nutrition research rather than a settled ceiling.
Where the Carbohydrate Floor Comes From
The 175g/day carbohydrate RDA is built from the combined glucose needs of the maternal brain and the fetal brain, both of which run almost entirely on glucose¹, and it's the figure this calculator uses. A 2023 narrative review proposed a higher figure by adding an estimate of placental glucose use to that same formula, but it's one research group's proposal, not trial evidence, and no guideline body has adopted it².
Why Fat Doesn't Change
Unlike protein and carbohydrate, fat's recommended share of your calories, 20 to 35 percent, is the same during pregnancy as it is otherwise. The pregnancy-specific fat story isn't about eating more fat overall, it's about fat quality, specifically getting enough DHA, an omega-3 fatty acid important for fetal brain and eye development. That's a sourcing question (fatty fish, algae-based supplements, fortified foods), not a quantity this calculator adjusts for.
A Note on Accuracy
This calculator is built for singleton pregnancies. These are population-level targets, not personalized prescriptions, actual needs vary with activity, appetite changes, and individual health conditions. If you're managing gestational diabetes, follow vegetarian or vegan, or have a history of disordered eating, work with your OB-GYN or a registered dietitian directly rather than relying on this calculator alone.
Frequently Asked Questions
How much protein do I need during pregnancy?
The RDA is 1.1 grams per kilogram of your pre-pregnancy weight per day, about 25g more than the standard non-pregnancy recommendation¹. Some evidence suggests more may be beneficial, especially later in pregnancy, but 1.1 g/kg is the well-established floor most guidance is built around.
Why is my carbohydrate target set at a minimum instead of a percentage?
Because the research behind it is structured that way. The 175g figure covers the combined glucose needs of your brain and your baby's brain¹. A flat percentage of calories doesn't reflect that underlying physiology as well as a gram-based floor does.
Do I need more fat during pregnancy?
Not more in total, the recommended fat range (20 to 35% of calories) is unchanged from the general population. What matters more is the type of fat, specifically getting enough DHA for fetal brain and eye development, which is a sourcing question, not a quantity this calculator adjusts.
Is this the same as the Pregnancy Calorie Calculator?
It builds on it. The calorie total uses the same method, this calculator adds the next layer, splitting that total into protein, carbohydrate, and fat targets using pregnancy-specific evidence for each.
Sources
Dietary Reference Intakes for Energy, Carbohydrate, Fiber, Fat, Fatty Acids, Cholesterol, Protein, and Amino Acids, Institute of Medicine, 2005
Re-examination of the Estimated Average Requirement for Carbohydrate Intake During Pregnancy: Addition of Placental Glucose Consumption, Hernandez & Rozance, 2023
Nutrition During Pregnancy, American College of Obstetricians and Gynecologists
A New Predictive Equation for Resting Energy Expenditure in Healthy Individuals, Mifflin et al., 1990
Pregnancy Macro Calculator
Use this pregnancy macro calculator to calculate protein, carb, and fat targets based on your calorie needs and pregnancy stage.
Updated August 12, 2026
Medical Disclaimer: This calculator provides a general estimate based on established research and is for educational purposes only, not a substitute for medical advice. Individual results can vary based on health conditions, so consult a qualified healthcare professional or registered dietitian before making significant changes to your diet, exercise, or health routine. Read our full Medical Disclaimer.
How Pregnancy Macros Are Calculated
Calories tell you how much to eat, macros tell you what to eat it as, and pregnancy shifts that second answer more than most people realize. Protein needs rise by a set amount tied to your body weight, carbohydrate has its own dedicated minimum built around fetal brain development, and fat, despite what "eating for baby's brain" messaging might suggest, doesn't actually need to increase in total quantity at all. This calculator treats each macro according to its own evidence, not one blanket percentage split.
What This Calculator Measures
This gives you a protein target in grams, a carbohydrate target in grams, and a fat range in grams, built on top of your pregnancy-adjusted calorie total. Protein is calculated first and shown with the most emphasis, since it's the macro with the clearest pregnancy-specific evidence behind it and the one most people underestimate.
The Formula
We start from your total daily calories, either calculated the same way as our Pregnancy Calorie Calculator (baseline maintenance calories plus ACOG's trimester increment) or entered directly³. Then each macro is calculated differently, on purpose:
Protein (g) = pre-pregnancy weight (kg) × 1.1
Fat (g) = 20% to 35% of total calories ÷ 9
Carbohydrate (g) = remaining calories ÷ 4, minimum 175g
Protein is calculated by body weight because that's how the evidence is actually structured¹. Fat is calculated as a percentage range because pregnancy doesn't change the underlying AMDR at all¹. Carbohydrate gets whatever's left over, with a hard floor, because its requirement is anchored to a fairly fixed physiological need, not a percentage of whatever else you're eating.
How This Calculator Computes Your Result
Enter your stats or your known calorie target and current trimester, same as the Pregnancy Calorie Calculator. We calculate protein first from your pre-pregnancy weight, then fat as a range of your total calories, then whatever calories remain become your carbohydrate target, checked against the 175g minimum. If protein and the low end of your fat range already leave less than 175g of room for carbs, we'll flag that rather than show you an unrealistically low number.
Why Protein Gets Top Billing
The IOM sets the pregnancy protein RDA at 1.1 g/kg of body weight, up from 0.8 g/kg outside pregnancy, an increase of roughly 25g/day for most people¹. That's a real, quantified shift, not a rounding error, and it's the single macro most pregnant people are likely to fall short on if they're not tracking it specifically.
Worth knowing: 1.1 g/kg is the RDA, a floor meant to cover the needs of nearly the whole population, not necessarily an optimal target. Some research and clinical practice suggest higher intakes, particularly in the second and third trimesters, may offer additional benefit, this remains an active area of nutrition research rather than a settled ceiling.
Where the Carbohydrate Floor Comes From
The 175g/day carbohydrate RDA is built from the combined glucose needs of the maternal brain and the fetal brain, both of which run almost entirely on glucose¹, and it's the figure this calculator uses. A 2023 narrative review proposed a higher figure by adding an estimate of placental glucose use to that same formula, but it's one research group's proposal, not trial evidence, and no guideline body has adopted it².
Why Fat Doesn't Change
Unlike protein and carbohydrate, fat's recommended share of your calories, 20 to 35 percent, is the same during pregnancy as it is otherwise. The pregnancy-specific fat story isn't about eating more fat overall, it's about fat quality, specifically getting enough DHA, an omega-3 fatty acid important for fetal brain and eye development. That's a sourcing question (fatty fish, algae-based supplements, fortified foods), not a quantity this calculator adjusts for.
A Note on Accuracy
This calculator is built for singleton pregnancies. These are population-level targets, not personalized prescriptions, actual needs vary with activity, appetite changes, and individual health conditions. If you're managing gestational diabetes, follow vegetarian or vegan, or have a history of disordered eating, work with your OB-GYN or a registered dietitian directly rather than relying on this calculator alone.
Frequently Asked Questions
How much protein do I need during pregnancy?
The RDA is 1.1 grams per kilogram of your pre-pregnancy weight per day, about 25g more than the standard non-pregnancy recommendation¹. Some evidence suggests more may be beneficial, especially later in pregnancy, but 1.1 g/kg is the well-established floor most guidance is built around.
Why is my carbohydrate target set at a minimum instead of a percentage?
Because the research behind it is structured that way. The 175g figure covers the combined glucose needs of your brain and your baby's brain¹. A flat percentage of calories doesn't reflect that underlying physiology as well as a gram-based floor does.
Do I need more fat during pregnancy?
Not more in total, the recommended fat range (20 to 35% of calories) is unchanged from the general population. What matters more is the type of fat, specifically getting enough DHA for fetal brain and eye development, which is a sourcing question, not a quantity this calculator adjusts.
Is this the same as the Pregnancy Calorie Calculator?
It builds on it. The calorie total uses the same method, this calculator adds the next layer, splitting that total into protein, carbohydrate, and fat targets using pregnancy-specific evidence for each.
Sources
Dietary Reference Intakes for Energy, Carbohydrate, Fiber, Fat, Fatty Acids, Cholesterol, Protein, and Amino Acids, Institute of Medicine, 2005
Re-examination of the Estimated Average Requirement for Carbohydrate Intake During Pregnancy: Addition of Placental Glucose Consumption, Hernandez & Rozance, 2023
Nutrition During Pregnancy, American College of Obstetricians and Gynecologists
A New Predictive Equation for Resting Energy Expenditure in Healthy Individuals, Mifflin et al., 1990
Pregnancy Macro Calculator
Use this pregnancy macro calculator to calculate protein, carb, and fat targets based on your calorie needs and pregnancy stage.
Updated August 12, 2026
Medical Disclaimer: This calculator provides a general estimate based on established research and is for educational purposes only, not a substitute for medical advice. Individual results can vary based on health conditions, so consult a qualified healthcare professional or registered dietitian before making significant changes to your diet, exercise, or health routine. Read our full Medical Disclaimer.
How Pregnancy Macros Are Calculated
Calories tell you how much to eat, macros tell you what to eat it as, and pregnancy shifts that second answer more than most people realize. Protein needs rise by a set amount tied to your body weight, carbohydrate has its own dedicated minimum built around fetal brain development, and fat, despite what "eating for baby's brain" messaging might suggest, doesn't actually need to increase in total quantity at all. This calculator treats each macro according to its own evidence, not one blanket percentage split.
What This Calculator Measures
This gives you a protein target in grams, a carbohydrate target in grams, and a fat range in grams, built on top of your pregnancy-adjusted calorie total. Protein is calculated first and shown with the most emphasis, since it's the macro with the clearest pregnancy-specific evidence behind it and the one most people underestimate.
The Formula
We start from your total daily calories, either calculated the same way as our Pregnancy Calorie Calculator (baseline maintenance calories plus ACOG's trimester increment) or entered directly³. Then each macro is calculated differently, on purpose:
Protein (g) = pre-pregnancy weight (kg) × 1.1
Fat (g) = 20% to 35% of total calories ÷ 9
Carbohydrate (g) = remaining calories ÷ 4, minimum 175g
Protein is calculated by body weight because that's how the evidence is actually structured¹. Fat is calculated as a percentage range because pregnancy doesn't change the underlying AMDR at all¹. Carbohydrate gets whatever's left over, with a hard floor, because its requirement is anchored to a fairly fixed physiological need, not a percentage of whatever else you're eating.
How This Calculator Computes Your Result
Enter your stats or your known calorie target and current trimester, same as the Pregnancy Calorie Calculator. We calculate protein first from your pre-pregnancy weight, then fat as a range of your total calories, then whatever calories remain become your carbohydrate target, checked against the 175g minimum. If protein and the low end of your fat range already leave less than 175g of room for carbs, we'll flag that rather than show you an unrealistically low number.
Why Protein Gets Top Billing
The IOM sets the pregnancy protein RDA at 1.1 g/kg of body weight, up from 0.8 g/kg outside pregnancy, an increase of roughly 25g/day for most people¹. That's a real, quantified shift, not a rounding error, and it's the single macro most pregnant people are likely to fall short on if they're not tracking it specifically.
Worth knowing: 1.1 g/kg is the RDA, a floor meant to cover the needs of nearly the whole population, not necessarily an optimal target. Some research and clinical practice suggest higher intakes, particularly in the second and third trimesters, may offer additional benefit, this remains an active area of nutrition research rather than a settled ceiling.
Where the Carbohydrate Floor Comes From
The 175g/day carbohydrate RDA is built from the combined glucose needs of the maternal brain and the fetal brain, both of which run almost entirely on glucose¹, and it's the figure this calculator uses. A 2023 narrative review proposed a higher figure by adding an estimate of placental glucose use to that same formula, but it's one research group's proposal, not trial evidence, and no guideline body has adopted it².
Why Fat Doesn't Change
Unlike protein and carbohydrate, fat's recommended share of your calories, 20 to 35 percent, is the same during pregnancy as it is otherwise. The pregnancy-specific fat story isn't about eating more fat overall, it's about fat quality, specifically getting enough DHA, an omega-3 fatty acid important for fetal brain and eye development. That's a sourcing question (fatty fish, algae-based supplements, fortified foods), not a quantity this calculator adjusts for.
A Note on Accuracy
This calculator is built for singleton pregnancies. These are population-level targets, not personalized prescriptions, actual needs vary with activity, appetite changes, and individual health conditions. If you're managing gestational diabetes, follow vegetarian or vegan, or have a history of disordered eating, work with your OB-GYN or a registered dietitian directly rather than relying on this calculator alone.
Frequently Asked Questions
How much protein do I need during pregnancy?
The RDA is 1.1 grams per kilogram of your pre-pregnancy weight per day, about 25g more than the standard non-pregnancy recommendation¹. Some evidence suggests more may be beneficial, especially later in pregnancy, but 1.1 g/kg is the well-established floor most guidance is built around.
Why is my carbohydrate target set at a minimum instead of a percentage?
Because the research behind it is structured that way. The 175g figure covers the combined glucose needs of your brain and your baby's brain¹. A flat percentage of calories doesn't reflect that underlying physiology as well as a gram-based floor does.
Do I need more fat during pregnancy?
Not more in total, the recommended fat range (20 to 35% of calories) is unchanged from the general population. What matters more is the type of fat, specifically getting enough DHA for fetal brain and eye development, which is a sourcing question, not a quantity this calculator adjusts.
Is this the same as the Pregnancy Calorie Calculator?
It builds on it. The calorie total uses the same method, this calculator adds the next layer, splitting that total into protein, carbohydrate, and fat targets using pregnancy-specific evidence for each.
Sources
Dietary Reference Intakes for Energy, Carbohydrate, Fiber, Fat, Fatty Acids, Cholesterol, Protein, and Amino Acids, Institute of Medicine, 2005
Re-examination of the Estimated Average Requirement for Carbohydrate Intake During Pregnancy: Addition of Placental Glucose Consumption, Hernandez & Rozance, 2023
Nutrition During Pregnancy, American College of Obstetricians and Gynecologists
A New Predictive Equation for Resting Energy Expenditure in Healthy Individuals, Mifflin et al., 1990