#### Year/Month/Date Question

```Is there a formula that can calculate years, months and days into a decimal?
For example: 23 years, 6 months, 0 days would be 23.5 years.
```
 0
Utf
11/18/2009 1:50:02 AM
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```Depends on how your years, months and days are stored.

Assuming they're in cells A1 (years), B1 (months) and C1 (days), then this
formula would get you close:
=A1+((B1*30)+C1)/365.25
That will actually return 23.49281, which if you round to 1 decimal place is
23.5

If you want to gty to get closer use B1*30.4375 instead of B1*30, since
365.25/12 = 30.4375 which you can "assume" is the average number of days in
any single month.

"Mike" wrote:

> Is there a formula that can calculate years, months and days into a decimal?
> For example: 23 years, 6 months, 0 days would be 23.5 years.
```
 0
Utf
11/18/2009 2:27:01 AM
```>For example: 23 years, 6 months, 0 days
>would be 23.5 years.

I assume the days will be less than "a months worth of days". You won't have
something like this:

23 years, 6 months, 72 days

So, how many days are in a month? 28, 29, 30 or 31?

What result would you expect from this:

23 years, 6 months, 29 days

Is this: 23 years, 6 months, 0 days, all in one cell?

How about posting several representative samples along with the results you
expect. As you can see there are a lot of details that need to be
considered!

--
Biff
Microsoft Excel MVP

"Mike" <Mike@discussions.microsoft.com> wrote in message
news:F8CC49E3-6893-4E9B-8CC9-42FC46F90505@microsoft.com...
> Is there a formula that can calculate years, months and days into a
> decimal?
> For example: 23 years, 6 months, 0 days would be 23.5 years.

```
 0
T
11/18/2009 2:36:26 AM
```Thanks!!

"JLatham" wrote:

> Depends on how your years, months and days are stored.
>
> Assuming they're in cells A1 (years), B1 (months) and C1 (days), then this
> formula would get you close:
> =A1+((B1*30)+C1)/365.25
> That will actually return 23.49281, which if you round to 1 decimal place is
> 23.5
>
> If you want to gty to get closer use B1*30.4375 instead of B1*30, since
> 365.25/12 = 30.4375 which you can "assume" is the average number of days in
> any single month.
>
>
> "Mike" wrote:
>
> > Is there a formula that can calculate years, months and days into a decimal?
> > For example: 23 years, 6 months, 0 days would be 23.5 years.
```
 0
Utf
11/18/2009 3:09:01 AM
```An answer to the month length problem might be to change your formula to
=A1+B1/12+C1/365.25

You might change the 365.25 to 365.2425 too.

But of course it depends what the OP really wants.
--
David Biddulph

"JLatham" <JLatham@discussions.microsoft.com> wrote in message
news:18DD2A51-CD3C-41BB-8719-43F80A71F268@microsoft.com...
> Depends on how your years, months and days are stored.
>
> Assuming they're in cells A1 (years), B1 (months) and C1 (days), then this
> formula would get you close:
> =A1+((B1*30)+C1)/365.25
> That will actually return 23.49281, which if you round to 1 decimal place
> is
> 23.5
>
> If you want to gty to get closer use B1*30.4375 instead of B1*30, since
> 365.25/12 = 30.4375 which you can "assume" is the average number of days
> in
> any single month.
>
>
> "Mike" wrote:
>
>> Is there a formula that can calculate years, months and days into a
>> decimal?
>> For example: 23 years, 6 months, 0 days would be 23.5 years.

```
 0
David
11/18/2009 10:34:37 AM

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