## How to use the ATAN2 function

*Article updated on March 27, 2018*

The ATAN2 function calculates the arctangent of an angle using specific x- and y-coordinates. The returned angle is in radians between -pi to pi, including pi.

The angle is between the x-axis and the line from (0,0) and point (x_num, y_num)

=ATAN2(B3)

### Excel Function Syntax

ATAN2(*x_num*, *y_num*)

### Arguments

x_num |
Required. The x-coordinate. |

y_num |
Required. The y-coordinate. |

### Comments

If x_num is 1 and y_num is 1 then the angle between the x-axis and the line from (0,0) to (1,1) is 45 degrees or 1/4 pi radians. 1/4 pi is 0.785398163.

### Functions in 'Math and trigonometry'

The ATAN2 function function is one of many functions in the 'Math and trigonometry' category.

Converts negative numbers to positive numbers, in other words, the ABS function removes the sign. Excel Function Syntax ABS(number) Arguments […]

The ACOS function calculates the arccosine, or inverse cosine, of a number. Formula in cell C3: =ACOS(B3) Excel Function Syntax […]

The ACOSH function calculates the inverse hyperbolic cosine of a number. Formula in cell C3: =ACOSH(B3) Excel Function Syntax ACOSH(number) […]

The ACOT function calculates the inverse cotangent of a number. The returned angle is given in radians from 0 (zero) […]

The ACOTH function calculates the inverse hyperbolic cotangent of a number. Formula in cell C3: =ACOTH(B3) Excel Function Syntax ACOTH(number) […]

The AGGREGATE function allows you to calculate different specific functions to a list or database. A special AGGREGATE function feature […]

The ASIN function calculates the arcsine of a number. The angle is in radians and is between -pi/2 to pi/2. =ASIN(B3) Excel […]

The ASINH function calculates the inverse hyperbolic sine of a number. =ASINH(B3) Excel Function Syntax ASINH(number) Arguments number Required. Any […]

The ATAN function calculates the arctangent of a number. The returned angle is in radians between -pi/2 to pi/2. =ATAN(B3) Excel […]

The ATAN2 function calculates the arctangent of an angle using specific x- and y-coordinates. The returned angle is in radians […]

The ATANH function calculates the inverse hyperbolic tangent of a number. =ATANH(B3) Excel Function Syntax ATANH(number) Arguments number Required. Must be […]

The BASE function converts a number into a text representation with a given radix (base). Formula in cell C3: =BASE(10, […]

The CEILING function rounds a number up to its nearest multiple. The number is rounded down if both the number […]

The COMBIN function returns the number of combinations for a specific number of elements out of a larger number of […]

The COMBINA function calculates the number of combinations for a given number of elements from a larger group of elements. Formula in […]

The COS function calculates the cosine of an angle. Formula in cell C3: =COS(B3) Excel Function Syntax COS(number) Arguments number […]

The COSH function calculates the hyperbolic cosine of a number. Formula in cell C3: =COSH(B3) Excel Function Syntax COSH(number) Arguments […]

The COT function calculates the cotangent of an angle specified in radians. Formula in cell C3: =COT(B3) Excel Function Syntax […]

The DECIMAL function converts a text representation of a number in a given base into a decimal number. Formula in […]

The DEGREES function calculates degrees from radians. Formula in cell C3: =DEGREES(B3) Excel Function Syntax DEGREES(angle) Arguments angle Required. The […]

The EVEN function rounds a number up to the nearest even whole number. An even number is a number that […]

Returns e raised to the power of a number, e equals 2.71828182845904. Example, e^2 equals 7.389056099 Formula in cell C3: […]

The FACT function returns the factorial of a number. Formula in cell C3: =FACT(B3) Example, 3! = 3*2*1 = 6 […]

The FACTDOUBLE returns the double factorial of a number. Formula in cell C3: =FACTDOUBLE(B3) Excel Function Syntax FACTDOUBLE(number) Arguments number […]

The FLOOR.MATH function rounds a number down to the nearest integer or to the nearest multiple of significance. Formula in […]

Removes the decimal part from positive numbers and returns the whole number (integer) except negative values are rounded down to […]

The LCM function calculates the least common multiple. The least common multiple is the smallest positive integer that is a […]

The LN function calculates the natural logarithm of a number. Natural logarithms are based on the constant e. Formula in […]

The LOG function calculates the logarithm of a number to a specific base. Formula in cell C3: =LOG(10) Excel Function […]

The MINVERSE function calculates the inverse matrix for a given array. This function is useful for solving equations with multiple variables. […]

The MMULT function calculates the matrix product of two arrays, an array as the same number of rows as array1 and […]

The Mod function returns the remainder after a number is divided by divisor. The Mod function is short for the Modulo […]

The MROUND function calculates a number rounded to a given multiple. Formula in cell D3: =MROUND(B3,C3) Excel Function Syntax MROUND(number, […]

The MULTINOMIAL function calculates the ratio of the factorial of a sum of values to the product of factorials. Formula […]

The MUNIT function calculates the identity matrix for a given dimension. Array formula in cell B2: =MUNIT(3) The formula above returns an […]

The PI function returns the number pi (¶). Formula in cell B3: =PI() Excel Function Syntax PI() Arguments PI function […]

The POWER function calculates a number raised to a power. Excel Function Syntax POWER(number, power) Arguments number Required. The number […]

The PRODUCT function returns the product of the numbers given in the argument. Formula in cell D3: =PRODUCT(B3:C3) Excel Function […]

The RADIANS function converts degrees to radians. Formula in cell C3: =RADIANS(B3) Excel Function Syntax RADIANS(angle) Arguments angle Required. The […]

The RAND function calculates a random real number greater than or equal to 0 and less than 1. The function […]

Returns a random whole number between the numbers you specify. This function is volatile meaning a new random number is […]

The SEC function calculates the secant of an angle. Formula in cell E3: =SEC(B3) Excel Function Syntax SEC(number) Arguments number […]

The SECH function calculates the hyperbolic secant of an angle. Formula in cell C3: =SECH(B3) Excel Function Syntax SECH(number) Arguments […]

The SERIESSUM function calculates the sum of a power series based on the following formula: SERIESSUM(x, n, m, a) = […]

The SIGN function returns the sign of a number. 1 for a positiv number, 0 (zero) for a 0 (zero) […]

The SIN function calculates the sine of an angle. Formula in cell C3: =SIN(B3) Excel Function Syntax SIN(number) Arguments number […]

The SINH function calculates the hyperbolic sine of a number. Formula in cell C3: =SINH(B3) Excel Function Syntax SINH(number) Arguments […]

The SQRT function calculates the positive square root. Formula in cell C3: =SQRT(B3) Excel Function Syntax SQRT(number) Arguments number Required. […]

The SUM function in Excel allows you to add values, the function returns the sum in the cell it is […]

The SUMIF function sums values based on a condition. The condition can be applied to the values being summed or […]

The SUMIFS function in cell D11 adds numbers from column D based on criteria applied to column B and C. […]

The SUMPRODUCT function calculates the product of corresponding values and then returns the sum of each multiplication.

The SUMSQ function calculates the sum of the squares of the arguments. Formula in cell D3: =SUMSQ(B3:B5) 2^2 = 4, […]

The SUMX2MY2function calculates the sum of the difference of squares of corresponding values in two arrays. Formula in cell F3: […]

The SUMX2PY2 function calculates the sum of the sum of squares of corresponding values in two arrays. The sum of […]

The SUMXMY2 function calculates the sum of squares of differences of corresponding values in two arrays. Formula in cell F3: […]

The TAN function calculates the tangent of an angle. Formula in cell C3: =TAN(B3) Excel Function Syntax TAN(number) Arguments number […]

The TANH function calculates the hyperbolic tangent of a number. Formula in cell C3: =TANH(B3) Excel Function Syntax TANH(number) Arguments number […]

The TRUNC function removes the fractional part of the number to an integer. Formula in cell C3: =TRUNC(B3) Excel Function […]

The picture above shows row 4 and row 8 hidden, the SUM argument 9 sums all values in C3:C11 whereas […]

The quotient function returns the integer portion of a division. Example, 5/2 = 2.5. The integer is 2. Excel Function […]