Fetus Weight Charts

Fetus Weight Charts
Graphs and Calculators


Ultrasound Examination Measurements
baby inside




  

Estimated Fetal Weight

  

Doing an ultrasound to estimate fetal weight near term is a very common practice, one still employed by many OBs, especially with large mothers.  However, research clearly shows that this is a very questionable practice.  The accuracy rate is very low, many women are pressured into interventions that do more harm than good, and even the mere PREDICTION of macrosomia (large baby) alters the way physicians perceive and treat labor.

A number of studies have questioned the use of ultrasound for estimated fetal birth weight.  Given its inaccuracy and resulting interventions, this does NOT seem to be a justifiable use of the technology unless co-existing conditions like diabetes are present (even then, some research questions its use).  However, it does remain common despite the research against it.

The information provided here cannot substitute the advice of a medical professional

Estimated fetal weight calculator

This calculator uses the most common ultrasound formula; proposed by Shephard et al.
Estimated fetal weight (eFW in Kg, BPD and AC in mm):
Log10(eFW)= -1.7492+(0.0166*BPD)+(0.0046*AC)-2.646*(BPD*AC)/1000

Enter a BPD and AC Measurement in mm:

BPD in mm =     AC in mm =

 grams

OR   ounces

  OR   pounds

 

Estimated Fetal Weight Percentile Chart Below

  

( The information provided here can not substitute the advice of a medical professional )

  

Estimated Fetal Weight Percentile Chart

Gestational Weeks = Estimated Fetal Weight Percentile Chart +/- 1.28 Standard Deviation
A fetus is considered normal if they are between 10th and 90th percentile ]
 
Avg
 Estimated Fetal Weight +/- SD 1.28
Gestational Weeks
EFW
10th%
90th%
16
146g (5oz)
121
171
17
181g (6oz)
150
212
18
223g (7oz)
185
261
19
273g (9oz)
227
319
20
331g (11oz)
275
387
21
399g (14oz)
331
467
22
478g (1lb)
398
559
23
568g (1lb 5oz)
471
665
24
670g (1lb 7oz)
556
784
25
785g (1lb 11oz)
652
918
26
913g (2lb)
758
1068
27
1055g (2lb 5oz)
876
1234
28
1210g (2lb 10oz)
1004
1416
29
1379g (3lb)
1145
1613
30
1559g (3lb 7oz)
1294
1824
31
1751g (3lb 13oz)
1453
2049
32
1953g (4lb 4oz)
1621
2285
33
2162g (4lb 12oz)
1794
2530
34
2377g (5lb 3oz)
1973
2781
35
2595g (5lb 11oz)
2154
3036
36
2813g (6lb 3oz)
2335
3291
37
3028g (6lb 10oz)
2513
3543
38
3236g (7lb 2oz)
2686
3786
39
3435g (7lb 9oz)
2851
4019
40
3619g (7lb 15oz)
3004
4234


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Fetal Growth Percentile Charts:

Measurement Charts:
BPD - OFD - HC  |  Femur and Humerus (FL HL)

Abdominal Circumference (AC)

  

Calculator for customised birth weight at term and optimal fetal weight according to gestation.

 NOTE:

No formula for estimating the fetal 'Birth Weight' has achieved an accuracy which enables us to recommend its use. It should be noted that errors of about 10% are reported and that even at this level of accuracy it is disappointing. It is suggested that there may be an improvement in accuracy of about 5% with using more than two parameters.

  

Maternal weight at booking(initial office visit)

or   First Trimester weight =

Maternal height =

Fetal sex (m or f) (if not known leave blank)

How many previous babies?

Ethnicity =

Calculated estimated birth weight at term = grams

10th to 90th centile range grams

Enter your week to obtain estimated fetal weight at that week

Pregnancy Week = + days = is grams

10th to 90th centile range grams

Expected fundal height cms
10th to 90th centiles


Weight converter : Imperial and Metric

Convert : Grams (g)  »»  Pounds (lb) and Ounces (oz)       
Grams (g)  

Pounds (lb)   Ounces (oz)

 
Convert : Pounds (lb)  »»  Kilograms (kg)       
Pounds (lb)   

Kilograms (kg)

1 pound [lb] = 16 oz = 454 grams [g]   ¦   1000 g = 1 Kilo [kg]

The information provided here cannot substitute the advice of a medical professional

 
Top

  

How many scans should I have?

 
As a practical matter, ultrasound scanning has proven to be so popular with patients and also their obstetricians, that almost everyone receiving regular prenatal care ends up with at least one scan anyway. The total number of scans will vary depending on whether a previous scan has detected certain abnormalities that require follow-up assessment.

There is no hard and fast rule for the number of scans you should have during pregnancy.

In some countries, sonograms are performed just twice during pregnancy. Once at 16 - 18 weeks to assess fetal abnormalities, and again at 32 - 34 weeks to assess age and well-being.

It is now recommended that all pregnant women have a dating scan in the first trimester - ideally at 10 to 13 weeks of pregnancy - to confirm your dates. This is especially important if you are going to have any screening tests for Down's syndrome, as knowing the exact dates makes sure your result is accurate. Most hospitals offer a scan in the second trimester at about 20 weeks (the anomaly scan) to check that your baby is developing normally.

 
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Related articles

  
Week by week scan pictures:   First Trimester


Examples of ultrasonography you may see used during your pregnancy.

Ultrasound information :-    Who, Why, When?
What happens during an ultrasound examination?
Can the scan show the gender of my baby?

Examples of ultrasonography you may see used during your pregnancy.
 
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Week By Week Pregnancy Progress Calendar

 
First Trimester
Week 1   Week 2   Week 3   Week 4   Week 5   Week 6   Week 7  
Week 8   Week 9   Week 10   Week 11   Week 12   Week 13
Second Trimester
Week 14   Week 15   Week 16   Week 17   Week 18   Week 19   Week 20  
Week 21   Week 22   Week 23   Week 24   Week 25   Week 26
Third Trimester
Week 27   Week 28   Week 29   Week 30   Week 31   Week 32   Week 33  
Week 34   Week 35   Week 36   Week 37   Week 38   Week 39   Week 40
 
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