Grade calculations

A grade calculation is a formula used to determine grades, based (optionally) on other grade items. Note that this is not the same as Calculated question types.

Calculations for the gradebook follow the pattern of formulas/functions in popular spreadsheet programs. They start with an equal (=) sign, and use common mathematical operators and functions to produce a single numerical output. This output is then used as the computed value for the grade item you are editing.

Setting a grade calculation

Calculator symbol

Example calculation

To set a grade calculation:

Login as teacher or other user with permission to edit grades
Click on Grades in the course administration block
Click the 'Categories and items' tab (or select it from the gradebook dropdown menu)
Click the 'calculator symbol' (in the 'Actions' column, on the category total line) for the category you wish to set a calculation for
Start with an equal sign (=)
Choose a function; Example: =sum()
Plug in your ID numbers enclosed in double square brackets, for example =sum([[item1]][[item2]][[item3]])
Separate each ID number with a comma, for example =sum([[item1]],[[item2]],[[item3]])
Click the "Save Changes" button

Assigning ID numbers

You can include the values of other grade items by using their ID number as references in your formulas. The ID number is surrounded by double square brackets, for example if you have a grade item with Quiz.3 as ID number, you will refer to this item as [[Quiz.3]] in your calculation.

Below the calculation field is a list of your course with its grade categories and grade items. Next to each item or category's total is displayed the ID number you can use in your calculation (already surrounded with double square brackets). However, since the ID number is optional, some items may not yet have one. These items without an ID number have instead a form field which lets you enter an ID number directly.

As soon as you have assigned the ID numbers you need, you can click the "Add ID numbers" button, and the page will reload and show you the same list with the ID numbers you have just assigned.

Calculation functions

Every calculation must start with an equal sign (=). Following is a list of the functions supported by the calculation. The comma (,) character is used to separate arguments within function brackets. The comma can also be used to separate different functions. (The separator character could be a semicolon (;) in other languages, see below).

average([[item1]], [[item2]]...): Returns the average of a sample
max([[item1]], [[item2]]...): Returns the maximum value in a list of arguments
min([[item1]], [[item2]]...): Returns the minimum value in a list of arguments
mod(dividend, divisor): Calculates the remainder of a division
pi(): Returns the value of the number Pi
power(base, power): Raises a number to the power of another
round(number, count): Rounds a number to a predefined accuracy
floor(number): Maps a real number to the largest previous integer
ceil(number): Maps a real number to the smallest following integer
sum([[item1]], [[item2]]...): Returns the sum of all arguments
an asterisk (*) gives the product of two items: [[item1]]*[[item2]]

A number of mathematical functions is also supported:

sin
sinh
arcsin
asin
arcsinh
asinh
cos
cosh
arccos
acos
arccosh
acosh
tan
tanh
arctan
atan
arctanh
atanh
sqrt
abs
ln
log
exp

Example calculations

=average([[Quiz.1]], [[Quiz.4]], [[Assignment.1]])
=average(max([[Quiz.1]], [[Quiz.4]], [[Assignment.1]]), min([[Quiz.1]], [[Quiz.4]], [[Assignment.1]]))
Weighted grade calculations where item 1 is weighted 30%, item 2 is weighted at 60% and item 3 is weighted at 200%: =sum([[1]]*0.3,[[2]]*0.6,[[3]]*2)

Calculations when user language is not English

Calculation formulas use decimal and list separators as defined in the langconfig.php file of each language pack.

The decimal separator (a symbol used to mark the boundary between the integral and the fractional parts of a decimal number) is a point (.) in English. In other languages it may be a comma (,).

The list separator (a symbol used to separate a list of ID numbers in square brackets) is a comma (,) in English. In other languages it may be a semicolon (;).

Documentation