Weeks to months

This online calculator converts given number of weeks to approximate number of months and days in the month

This calculator can help you if you are looking for the answer to the questions like:

  • 17 weeks in months?
  • how much is 13 weeks in months?
  • how long is 10 weeks in months?
  • what are 28 weeks in months?
  • 16 weeks is how many months?

As you can see, there are many ways to ask, but essentially it is all about converting weeks to months. I think this is what pregnant women often look for. Conversion is based on averages so that it may slip a day or several days in the case of February, etc., but I think averages are good enough for most people. For those interested, the calculation and why it can slip a day are explained below the calculator.

PLANETCALC, Weeks to months

Weeks to months


Weeks in months

Speaking of averages, the calculator considers a month to be 365/12=30,416667 days long.

Let's calculate 5 weeks interval using this value. 5 weeks is 35 days. 35 days is 30,416667 + 4,58333, which is 1 month and 4 days if we take the closest integer number below 4,58333.
Now let's compare this result to real-life cases:

  • If we start counting from the 1st of January, 35 days is indeed 1 month 4 days
  • If we start counting from the 1st of February, 35 days is 1 month 7 days (for leap year, it is 1 month 6 days)
  • If we start counting from the 1st of April, 35 days is 1 month 5 days.

So, in some cases, it can slip a day because of 30/31 days in a month, and more if February is involved. But if we talk about pregnancy, probably, it doesn't matter.

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PLANETCALC, Weeks to months