ในการสร้างสูตร สำหรับ Post ก่อนหน้านี้ เป็นการรวบรวมว่ามี ตัวคำนวนอะไรบ้างที่ใช้งาน ได้ใน Pestimate  (สิงหาคม 2556 ถ้าลูกค้าก่อนหน้านี้ ขอ Update ได้ครับ )
           AND
 Returns TRUE if all of its arguments are TRUE
 =AND(logical1[, logical2,…])
            FALSE
 Returns the logical value FALSE
 =FALSE
            IF
 Specifies a logical test to perform
 =IF(logical_test, value_if_true, value_if_false)
            NOT
 Reverses the logic of its argument
 =NOT(logical)
            OR
 Returns TRUE if any argument is TRUE
 =OR(logical1[, logical2,…])
            TRUE
 Returns the logical value TRUE
 =TRUE";
        const string MATH =
            ACOS
 Returns the arccosine of a number
 =ACOS(number)
            ASIN
 Returns the arcsine of a number
 =ASIN(number)
            ATAN
 Returns the arctangent of a number
 =ATAN(number)
            ATAN2
 Returns the arctangent from x- and y-coordinates
 =ATAN2(x_num, y_num)
            CEILING
 Rounds a number to the nearest integer or to the nearest multiple of significance
 =CEILING(number)
            COS
 Returns the cosine of a number
 =COS(number)
            COSH
 Returns the hyperbolic cosine of a number
 =COSH(number)
            EXP
 Returns e raised to the power of a given number
 =EXP(number)
            FLOOR
 Rounds a number down, toward zero
 =FLOOR(number)
            INT
 Rounds a number down to the nearest integer
 =INT(number)
            LN
 Returns the natural logarithm of a number
 =LN(number)
            LOG
 Returns the logarithm of a number to a specified base
 =LOG(number[, base])
            LOG10
 Returns the base-10 logarithm of a number
 =LOG10(number)
            PI    
 Returns the value of 3.14159  =PI()
            POWER
 Returns the result of a number raised to a power
 =POWER(number, power)
            RAND
 Returns a random number between 0 and 1
 =RAND()
            RANDBETWEEN
 Returns a random number between the numbers you specify
 =RANDBETWEEN(bottom, top)
            SIGN
 Returns the sign of a number
 =SIGN(number)
            SIN
 Returns the sine of the given angle
 =SIN(number)
            SINH
 Returns the hyperbolic sine of a number
 =SINH(number)
            SQRT
 Returns a positive square root
 =SQRT(number)
            SUM
 Adds its arguments
 =SUM(number1[, number2, …])
            TAN
 Returns the tangent of a number
 =TAN(number)
            TANH
 Returns the hyperbolic tangent of a number
 =TANH(number)
            TRUNC
 Truncates a number to an integer
 =TRUNC(number)";
        const string STATISTICAL =
           AVERAGE
 Returns the average of its arguments
 values
 =AVERAGE(number1 [, number2, …])
            COUNT
 Counts how many numbers are in the list of arguments
 =AVERAGEA(number1 [, number2, …])
            MAX
 Returns the maximum value in a list of arguments
 =MAX(number1 [, number2, …])
            MIN
 Returns the minimum value in a list of arguments
 =MIN(number1 [, number2, …])
            STDEV
 Estimates standard deviation based on a sample
 =STDEV(number1 [, number2, …])
            STDEVP
 Calculates standard deviation based on the entire population
 =STDEVP(number1 [, number2, …])
            STDEVPA
 Calculates standard deviation based on the entire population, including numbers, text, and logical values
 =STDEVPA(number1 [, number2, …])
            VALUE
 Converts a text argument to a number
 =VALUE(text);