This error comes when you try to store an out-of-range floating point value into a numeric variable. For example, if your NUMERIC or DECIMAL variable is defined as NUMERIC(5,2) then the maximum value it can hold is 999.99, if you try to store something like 1000.00 then it will throw

A NUMERIC(5,2) means, the total number of digits in the value cannot exceed 5 and decimal precision is 2 digits i.e. the maximum possible value is 999.99.

Another thing SQL programmers don't know and remember about NUMERIC or DECIMAL data types in Microsoft SQL Server is that it doesn't throw this error if you specify more digits than permitted after the decimal point, instead, it does rounding for example if you store 100.999 then it will store 101.00 after rounding.

Here is an SQL query to prove these points:

Arithmetic overflow error converting numeric to data type numeric.

###

This time SQL Server throws the error because we are trying to store 1000 but the maximum value a NUMERIC(5,2) can hold is 999 before the decimal point. You need to increase the width of the variable to store this number e.g. making @sample NUMERIC(6,2) will solve this error as shown below.

**"Arithmetic overflow error converting numeric to data type numeric"**. One of the common reasons for this error is the ignorance and misunderstanding of the NUMERIC data type. For example, many SQL Server DBAs and developers think that a NUMERIC(5,2) variable can hold a 7 digit floating point number where 5 digits are before the decimal and 2 digits are after the decimal. This is**wrong**.A NUMERIC(5,2) means, the total number of digits in the value cannot exceed 5 and decimal precision is 2 digits i.e. the maximum possible value is 999.99.

Another thing SQL programmers don't know and remember about NUMERIC or DECIMAL data types in Microsoft SQL Server is that it doesn't throw this error if you specify more digits than permitted after the decimal point, instead, it does rounding for example if you store 100.999 then it will store 101.00 after rounding.

Here is an SQL query to prove these points:

DECLARE @sample NUMERIC(5,2) SET @sample = 1000.554 SELECT @sample

**Output**Arithmetic overflow error converting numeric to data type numeric.

###
**Explanation: **

This time SQL Server throws the error because we are trying to store 1000 but the maximum value a NUMERIC(5,2) can hold is 999 before the decimal point. You need to increase the width of the variable to store this number e.g. making @sample NUMERIC(6,2) will solve this error as shown below.By the way, if you are new to Microsoft SQL Server and T-SQL then I also suggest you join a comprehensive course to learn SQL Server fundamentals and how to work with T-SQL. If you need a recommendation then I suggest you go through the

**Microsoft SQL for Beginners online course**by Brewster Knowlton on Udemy. It's a great course to start with T-SQL and SQL queries in SQL Server.##
__Arithmetic overflow error converting numeric to data type numeric in SQL Server Examples__

Here are some more SQL queries which will confirm the behavior of the NUMERIC variable and its range:DECLARE @sample NUMERIC(5,2) SET @sample = 100.554 // no rounding because the extra digit is less than 5 SELECT @sample AS Result Result 100.55 DECLARE @sample NUMERIC(5,2) SET @sample = 100.555 // rounding will happen SELECT @sample AS Result Result 100.56 DECLARE @sample NUMERIC(5,2) SET @sample = 100.55 // no rounding because value is under defined precision SELECT @sample AS Result Result 100.55 DECLARE @sample NUMERIC(5,2) SET @sample = 100.999 // Rounding to nearest value SELECT @sample AS Result Result 101.00 DECLARE @sample NUMERIC(5,2) SET @sample = 999.999 // error because after rounding value will be // out-of-range for defined numeric type SELECT @sample AS Result Result Arithmetic overflow error converting numeric to data type numeric.

That's all about

**"Arithmetic overflow error converting numeric to data type numeric in SQL Server"**. You can see that cause of the error is usually out-of-range value for the defined NUMERIC type. Just check the source of value and correct or increase the precision level of your column.

Always remember that NUMERIC(5,2) means a total of 5 digits with 2 digits after the decimal point, and the maximum value it can hold is 999.99. Beware of rounding due to more additional digits after the decimal point, which can also cause "Arithmetic overflow error converting numeric to data type numeric" in Microsoft SQL Server.

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Thanks for reading this article. If you like the information given here and my explanation then please share it with your friends and colleagues.

## 4 comments :

Nice article, Thanks so much for the clear explanation about numeric values

Thanks Johnson, Glad you find my explanation useful.

Thanks for the article!

You may be casting into too small an item.

E.G.

CAST ( (ITEMA *1.0 /ITEMB) AS VARCHAR(4) )

A case statement checks that the value is between 100 and 1000, and it was assumed (wrongly) that the value would fit into a four character container.

ITEMA and ITEMB are type INT.

The code errored (Arithmetic overflow) when trying to put numeric values like

nnn.0000000 into the 4 character container.

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