
Calculate the date a week later 
Create a formula date type field which displays the date that's a week later than the value in the Start Date field. 
Dates 
[Start Date] + Days (7) 
Take the value in the Start Date field and add seven days to it. 
Date 


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Calculate the number of weeks into the year a date is 
In Excel I can use the WeekNum function to calculate how many weeks into the year a particular date is. How do I do this in QuickBase? 
Dates 
Int(DayofYear([datefield])/7+1)

Find the day of the year that the date field is (in other words how many days into the year the date is). Then divide by seven to get the number of weeks into the year. Add one. Then show the integer only (in other words, leave off any fractional values that follow the decimal point). 
Numeric 
There is no week 0, so the first week is 1. That's why you add 1.
This formulas returns the "Absolute Week Number" which counts weeks starting from January 1st, no matter what day of the week it is. In other words, Jan 1st through 7th is always week one. If Jan 1st is a Tuesday, than each week of the year will be Tuesday through Monday and tallied accordingly. 
If you'd like to calculate the week number, but specify that each week begin on a Sunday (in other words, week one always ends on the first Saturday of January and following weeks are tallied based on that premise) try this formula instead:
Int(DayOfYear(Days(DayOfWeek(FirstDayOfYear([MyDate])))
+ [MyDate])/7+1) 
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Calculate a task's finish date, based on the start date and number entered in the Estimated # of Days field. 
Adding a numeric value (Estimated # of Days) to a date value doesn't work. 
Type Conversion 
[Actual Start Date]+ Days([Estimated # of days]) 
Convert the number in the Estimated # of days field into a duration that represents a number of days and add it to the Actual Start Date. 
Date 
The Days() function converts the numeric value into a Duration value. 

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Calculate the number of months until a payoff date 

Dates 
((Year([Payoff Date])  Year(Today()) )* 12) + (Month([Payoff Date])  Month(Today()) ) 
Take this year (that today's date occurs in) and subtract it from the year listed in the Payoff Date field. Then multiply that number of years by 12 (to get months). Take that number of months and add it to the number of months that results from subtracting this month from the month listed in the Payoff date field. 
Numeric 
You're really calculating the number of months in two steps. On the left side of the plus sign, you're figuring out how many years until the payoff date and converting that into months. On the right side of the plus sign, you're figuring out the difference in months. The plus sign then adds those figures together. 

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Calculate the date one week from today 

Dates 
Today() + Days(7) 
Display the date that is today plus 7 days. 
Date 


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Add up the number of hours worked in a week. 
Sum the values of hours entered for each day of the week. 
Calculation 
Nz([Mon]) + Nz([Tues] + Nz([Wed]) + Nz([Thurs]) + Nz([Fri]) 
Return the value in the Mon field. If the Mon field is empty (null) then return zero. Add that to the value in the Tues field. If the Tues field is empty (null) then return zero. Add that to the value in the Wed field, and so on. 
Numeric 
You'd use Nz here instead of IsNull, because in order to add these values together, QuickBase needs the result to be a number. Nz generates a zero for a null, which the program can use in the calculation. 

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Calculate the number of checkboxes that a user turned on 
Total the boxes checked (turned on) within a given record 
Calculation 
ToNumber([Checkbox1]) + ToNumber([Checkbox2]) 
Convert the value in Checkbox1 to a number and add it to the value in Checkbox 2. Include as many checkbox fields as necessary 
Numeric 
The ToNumber formula returns a 1 for true or yes and a 0 otherwise. 

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Convert a value representing time in minutes into seconds 
When I enter a time in minutes and seconds (ie. 3.42) I need to be able to convert these to seconds. 
Time 
ToNumber(Left([Minutes], ".")) * 60 + ToNumber(Right([Minutes], ".")) 
The Left function will return all the text up to but not including the period. In the example, that is 3. Since it is a text value, convert it into a number using the ToNumber function and then multiply the result by 60 to get seconds.
Do the same to extract the text after the period using the Right function. Finally, we add it up to get the total seconds  in this case it should be 3*60 + 50 = 230 seconds. 
Numeric 
Use a text field to store the number (like 3.42) since three minutes and 42 seconds is not the same thing as 3.42 seconds. 

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Calculate how many fields are empty 
I need to create a field that counts the number of field that are non blank. The field that I need to count are labeled Model number 1, Model number 2 etc... 
Calculation 
ToNumber(IsNull([Model number 1])) +
ToNumber(IsNull([Model number 2])) 
IsNull returns a yes or no result, which when you convert it to a number using the ToNumber() function, becomes a one for yes or a zero for no. Insert a + operator to add all values together. Add as many additional fields as you need. 
Numeric 
This solution assumes that the Model Number fields are numeric. If those fields are text type fields, the IsNull() function wont work. Try something like the following instead:
ToNumber(If (Length([Model number 1]) > 0, true, false) +
ToNumber(If (Length([Model number 2]) > 0, true, false) 

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Tally duration fields even if one or two are empty (null) 
Total Actual Duration  [Actual Duration] + [Actual Duration 1] + [Actual Duration 2] 
Calculation 
Nz([Actual Duration]) + Nz([Actual Duration 1]) + Nz([Actual Duration 2]) 
Return the value in the Actual Duration field. If the Actual Duration field is empty (null) then return zero. Add that to the value in the Actual Duration 1 field. If the Actual Duration 1 field is empty (null) then return zero. Add that to the value in the Actual Duration 2 field, and so on. 
Duration 
You'd use the Nz() function here instead of IsNull(), because in order to add these values together, QuickBase needs the result to be a number. Nz generates a zero for a null, which the program can use in the calculation. 

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