Planning gain over 4 weeks
3.2–4.0lb
Uses the published singleton weekly pace
Educational pregnancy planning tool
Pregnancy Weight Gain Calculator
See a four-week planning range and modeled week-by-week guide based on pre-pregnancy BMI and pregnancy type.
Step 2 · Your planning range
Week 16 to week 20
Singleton pregnancy · Normal BMI · BMI 22.5
Planning weight range at week 20
142.2–143.0lb
Illustrative path from your current entry
Recommended total pregnancy gain
25.0–35.0lb
Published BMI-based total range
Preparing the week-by-week chart…
Current position
Within the modeled guide band
BelowModeled guide bandAbove
Your entered gain sits within the modeled planning band for this week. This is an educational comparison, not a clinical assessment. At week 16, the modeled weight band is 138.8–142.8 lb.
The next 4 weeks
A short view anchored to today
W17
W18
W19
W20
The bars show cumulative planning gain from your current entry, not weekly weigh-in targets or a prediction.
See all weekly values
| Week | Modeled guide weight | Planning path |
|---|---|---|
| 1 | 135.1–135.3 lb | — |
| 2 | 135.2–135.7 lb | — |
| 3 | 135.3–136.0 lb | — |
| 4 | 135.3–136.4 lb | — |
| 5 | 135.4–136.7 lb | — |
| 6 | 135.5–137.0 lb | — |
| 7 | 135.6–137.4 lb | — |
| 8 | 135.7–137.7 lb | — |
| 9 | 135.8–138.0 lb | — |
| 10 | 135.8–138.4 lb | — |
| 11 | 135.9–138.7 lb | — |
| 12 | 136.0–139.1 lb | — |
| 13 | 136.1–139.4 lb | — |
| 14 | 137.0–140.5 lb | — |
| 15 | 137.9–141.7 lb | — |
| 16 | 138.8–142.8 lb | 139.0–139.0 lb |
| 17 | 139.6–143.9 lb | 139.8–140.0 lb |
| 18 | 140.5–145.1 lb | 140.6–141.0 lb |
| 19 | 141.4–146.2 lb | 141.4–142.0 lb |
| 20 | 142.3–147.3 lb | 142.2–143.0 lb |
| 21 | 143.2–148.5 lb | 143.0–144.0 lb |
| 22 | 144.1–149.6 lb | 143.8–145.0 lb |
| 23 | 145.0–150.7 lb | 144.6–146.0 lb |
| 24 | 145.8–151.9 lb | 145.4–147.0 lb |
| 25 | 146.7–153.0 lb | 146.2–148.0 lb |
| 26 | 147.6–154.1 lb | 147.0–149.0 lb |
| 27 | 148.5–155.3 lb | 147.8–150.0 lb |
| 28 | 149.4–156.4 lb | 148.6–151.0 lb |
| 29 | 150.3–157.5 lb | 149.4–152.0 lb |
| 30 | 151.1–158.7 lb | 150.2–153.0 lb |
| 31 | 152.0–159.8 lb | 151.0–154.0 lb |
| 32 | 152.9–160.9 lb | 151.8–155.0 lb |
| 33 | 153.8–162.1 lb | 152.6–156.0 lb |
| 34 | 154.7–163.2 lb | 153.4–157.0 lb |
| 35 | 155.6–164.3 lb | 154.2–158.0 lb |
| 36 | 156.5–165.5 lb | 155.0–159.0 lb |
| 37 | 157.3–166.6 lb | 155.8–160.0 lb |
| 38 | 158.2–167.7 lb | 156.6–161.0 lb |
| 39 | 159.1–168.9 lb | 157.4–162.0 lb |
| 40 | 160.0–170.0 lb | 158.2–163.0 lb |
How it works
Guidance with the assumptions visible.
- 01
Pre-pregnancy BMI selects the range.
Height and pre-pregnancy weight determine the BMI category used for the published total and weekly guidance.
- 02
The first trimester uses a modest total band.
Singleton planning assumes roughly 1.1–4.4 lb of total gain through week 13, then transitions to the BMI-specific pace.
- 03
The planning path starts at your current entry.
The solid line is anchored to the current weight you entered. It is illustrative: it does not rewrite your earlier weeks, predict a medical outcome, or set a clinical target.
Trust & methodology
A planning tool with a paper trail
The ranges are maintained against CDC, National Academies, and ACOG pregnancy guidance. The calculation runs locally and keeps its assumptions visible.
Last sitewide review
June 11, 2026
Maintained by
Baby Milk Calculator editorial team
Editorial policy
Who writes the site, how sources are chosen, how updates and corrections are handled.
Read
How we calculate
The intake ranges, unit conversions, and guardrails behind every result.
Read
Corrections & contact
Send a question or correction to support@milkcalculator.org.
Read
SourcesCenters for Disease Control and PreventionNational AcademiesAmerican College of Obstetricians and Gynecologists
FAQ
Common questions.
01Which weight should I use for pre-pregnancy weight?
Use your weight immediately before pregnancy when available. That value and your height determine the BMI category used for the guideline range.
02Why can my current weight be outside the shaded range?
The chart compares your entry with a modeled guide band, not a diagnosis or exact target. Pregnancy patterns vary, and your prenatal care professional can interpret your trend in context.
03How does the twins timeline work?
CDC publishes BMI-based total ranges and tracker bands for twins. The weekly twin planning path here is a modeled interpolation, not a separate clinical weekly recommendation.
04Does the calculator save my measurements?
No. The calculation runs in your browser and the values are not stored or sent by this tool.
Primary references
Where the ranges come from.
01
Weight Gain During PregnancyCenters for Disease Control and Prevention
CDC guidance on BMI-specific total weight-gain ranges for singleton and twin pregnancies, with downloadable tracking charts.
02
Weight Gain During Pregnancy: Reexamining the GuidelinesNational Academies of Sciences, Engineering, and Medicine
The guideline report behind recommended total gain and second- and third-trimester weekly rates by pre-pregnancy BMI.
03
How much weight should I gain during pregnancy?American College of Obstetricians and Gynecologists
ACOG patient guidance on healthy pregnancy weight gain and using pre-pregnancy BMI to set a goal.
04
Multiple PregnancyAmerican College of Obstetricians and Gynecologists
ACOG patient guidance on prenatal care and nutrition considerations for twins and higher-order multiple pregnancies.
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