Question about memory usage in excel

lars1565

New Member
Joined
Apr 18, 2016
Messages
8
I have a grade book for a school. It is shared online for teachers and staff to use/edit. Due to the number of formulas it can get kind of bogged down. So I am looking to save some processing power and accomplish the same task.
A teacher enters a percent in cell then the cell below has a large formula to calculate the letter grade associated with that percent. So each cell has a big formula for each student and each of their classes.
I am wondering if I switch from: =IF(F1405>=0.93,"A",IF(F1405>=0.9,"A-",IF(F1405>=0.87,"B+",IF(F1405>=0.83,"B",IF(F1405>=0.8,"B-",IF(F1405>=0.77,"C+",IF(F1405>=0.73,"C",IF(F1405>=0.7,"C-",IF(F1405>=0.67,"D+",IF(F1405>=0.63,"D",IF(F1405>=0.6,"D-",IF(F1405="","","N"))))))))))
to: a short lookup() formula with a table that has percent and associated grades. Would that use less memory and run faster?

Thanks
 

shg

MrExcel MVP
Joined
May 7, 2008
Messages
21,718
Office Version
2010
Platform
Windows
A​
B​
C​
1​
Score
Grade
2​
95%​
AB2: =IF(A2="", "", LOOKUP(A2, {0,60,63,67,70,73,77,80,83,87,90,93}%, {"N","D-","D","D+","C-","C","C+","B-","B","B+","A-","A"}))
3​
92%​
A-
4​
87%​
B+
5​
86%​
B
6​
81%​
B-
7​
78%​
C+
8​
72%​
C-
9​
68%​
D+
10​
64%​
D
11​
62%​
D-
12​
59%​
N
 

Dave Patton

Well-known Member
Joined
Feb 15, 2002
Messages
3,780
The following is just shg's suggestion with a table for the Lookup.

<b>Excel 2010</b><table cellpadding="2.5px" rules="all" style=";background-color: rgb(255,255,255);border: 1px solid;border-collapse: collapse; border-color: rgb(187,187,187)"><colgroup><col width="25px" style="background-color: rgb(218,231,245)" /><col /><col /><col /><col /></colgroup><thead><tr style=" background-color: rgb(218,231,245);text-align: center;color: rgb(22,17,32)"><th></th><th>A</th><th>B</th><th>C</th><th>D</th></tr></thead><tbody><tr ><td style="color: rgb(22,17,32);text-align: center;">1</td><td style="text-align: center;border-top: 1px solid black;border-right: 1px solid black;border-bottom: 1px solid black;border-left: 1px solid black;color: #0070C0;background-color: #F3F3F3;;">Score</td><td style="text-align: center;border-top: 1px solid black;border-right: 1px solid black;border-bottom: 1px solid black;border-left: 1px solid black;color: #0070C0;background-color: #F3F3F3;;">Grade</td><td style="text-align: center;border-top: 1px solid black;border-right: 1px solid black;border-bottom: 1px solid black;border-left: 1px solid black;color: #0070C0;background-color: #F3F3F3;;">Grade</td><td style="text-align: center;border-top: 1px solid black;border-right: 1px solid black;border-bottom: 1px solid black;border-left: 1px solid black;color: #0070C0;background-color: #F3F3F3;;">Grade</td></tr><tr ><td style="color: rgb(22,17,32);text-align: center;">2</td><td style="text-align: right;border-top: 1px solid black;border-right: 1px solid black;border-bottom: 1px solid black;border-left: 1px solid black;color: #333333;background-color: #FAFAFA;;">95%</td><td style="border-top: 1px solid black;border-right: 1px solid black;border-bottom: 1px solid black;border-left: 1px solid black;color: #333333;background-color: #CCFFCC;;">A</td><td style="border-top: 1px solid black;border-right: 1px solid black;border-bottom: 1px solid black;border-left: 1px solid black;color: #333333;background-color: #CCFFCC;;">A </td><td style="border-top: 1px solid black;border-right: 1px solid black;border-bottom: 1px solid black;border-left: 1px solid black;color: #333333;background-color: #CCFFCC;;">A </td></tr></tbody></table><p style="width:1.2em;font-weight:bold;margin:0;padding:0.2em 0.6em 0.2em 0.5em;border: 1px solid rgb(187,187,187);border-top:none;text-align: center;background-color: rgb(218,231,245);color: rgb(22,17,32)">4b</p><br /><br /><table width="85%" cellpadding="2.5px" rules="all" style=";border: 2px solid black;border-collapse:collapse;padding: 0.4em;background-color: rgb(255,255,255)" ><tr><td style="padding:6px" ><b>Worksheet Formulas</b><table cellpadding="2.5px" width="100%" rules="all" style="border: 1px solid;text-align:center;background-color: rgb(255,255,255);border-collapse: collapse; border-color: rgb(187,187,187)"><thead><tr style=" background-color: rgb(218,231,245);color: rgb(22,17,32)"><th width="10px">Cell</th><th style="text-align:left;padding-left:5px;">Formula</th></tr></thead><tbody><tr><th width="10px" style=" background-color: rgb(218,231,245);color: rgb(22,17,32)">B2</th><td style="text-align:left">=IF(<font color="Blue">A2="", "", LOOKUP(<font color="Red">A2, {0,60,63,67,70,73,77,80,83,87,90,93}%, {"N","D-","D","D+","C-","C","C+","B-","B","B+","A-","A"}</font>)</font>)</td></tr><tr><th width="10px" style=" background-color: rgb(218,231,245);color: rgb(22,17,32)">C2</th><td style="text-align:left">=LOOKUP(<font color="Blue">A2,$E$1:$F$12</font>)</td></tr><tr><th width="10px" style=" background-color: rgb(218,231,245);color: rgb(22,17,32)">D2</th><td style="text-align:left">=LOOKUP(<font color="Blue">A2,rGrades</font>)</td></tr></tbody></table></td></tr></table><br /><table width="85%" cellpadding="2.5px" rules="all" style=";border: 2px solid black;border-collapse:collapse;padding: 0.4em;background-color: rgb(255,255,255)" ><tr><td style="padding:6px" ><b>Workbook Defined Names</b><table cellpadding="2.5px" width="100%" rules="all" style="border: 1px solid;text-align:center;background-color: rgb(255,255,255);border-collapse: collapse; border-color: rgb(187,187,187)"><thead><tr style=" background-color: rgb(218,231,245);color: rgb(22,17,32)"><th width="10px">Name</th><th style="text-align:left">Refers To</th></tr></thead><tbody><tr><th width="10px" style=" background-color: rgb(218,231,245);color: rgb(22,17,32)">rGrades</th><td style="text-align:left">='4b'!$E$1:$F$12</td></tr></tbody></table></td></tr></table><br />
 

shg

MrExcel MVP
Joined
May 7, 2008
Messages
21,718
Office Version
2010
Platform
Windows
Your current formula and all of the alternatives should be lightning fast. I'd be inclined to use Dave's suggestion to put the lookup data in a table -- just be aware that you you change the table (like you decide to start grading on a curve), it will change all of the grades, some perhaps unintendedly.
 

Dave Patton

Well-known Member
Joined
Feb 15, 2002
Messages
3,780
Hopefully, the suggested formula helps.

Once the grades are calculated, the information may be static;
consequently, the formula results could be converted to values.

With about 1050 students, the file with the formulas is just 70k.
The file with all rows as values except the first row of calculations is just 54K.

Your file may include other calculations or statistics that are resource intensive.

<b>Excel 2010</b><table cellpadding="2.5px" rules="all" style=";background-color: rgb(255,255,255);border: 1px solid;border-collapse: collapse; border-color: rgb(187,187,187)"><colgroup><col width="25px" style="background-color: rgb(218,231,245)" /><col /><col /><col /><col /><col /></colgroup><thead><tr style=" background-color: rgb(218,231,245);text-align: center;color: rgb(22,17,32)"><th></th><th>A</th><th>B</th><th>C</th><th>D</th><th>E</th></tr></thead><tbody><tr ><td style="color: rgb(22,17,32);text-align: center;">1</td><td style=";">Name</td><td style="text-align: center;color: #0070C0;;">Score</td><td style="text-align: center;color: #0070C0;;">Grade</td><td style="text-align: center;color: #0070C0;;">Grade</td><td style="text-align: center;color: #0070C0;;">Grade</td></tr><tr ><td style="color: rgb(22,17,32);text-align: center;">2</td><td style=";">A1233</td><td style="text-align: right;color: #333333;;">95%</td><td style="color: #333333;;">A </td><td style="color: #333333;;">A </td><td style="color: #333333;;">A </td></tr><tr ><td style="color: rgb(22,17,32);text-align: center;">3</td><td style=";">A1234</td><td style="text-align: right;color: #333333;;">92%</td><td style="color: #333333;;">A-</td><td style="color: #333333;;">A-</td><td style="color: #333333;;">A-</td></tr></tbody></table><p style="width:3.6em;font-weight:bold;margin:0;padding:0.2em 0.6em 0.2em 0.5em;border: 1px solid rgb(187,187,187);border-top:none;text-align: center;background-color: rgb(218,231,245);color: rgb(22,17,32)">Sheet1</p><br /><br /><table width="85%" cellpadding="2.5px" rules="all" style=";border: 2px solid black;border-collapse:collapse;padding: 0.4em;background-color: rgb(255,255,255)" ><tr><td style="padding:6px" ><b>Worksheet Formulas</b><table cellpadding="2.5px" width="100%" rules="all" style="border: 1px solid;text-align:center;background-color: rgb(255,255,255);border-collapse: collapse; border-color: rgb(187,187,187)"><thead><tr style=" background-color: rgb(218,231,245);color: rgb(22,17,32)"><th width="10px">Cell</th><th style="text-align:left;padding-left:5px;">Formula</th></tr></thead><tbody><tr><th width="10px" style=" background-color: rgb(218,231,245);color: rgb(22,17,32)">C2</th><td style="text-align:left">=LOOKUP(<font color="Blue">B2,$F$1:$G$12</font>)</td></tr><tr><th width="10px" style=" background-color: rgb(218,231,245);color: rgb(22,17,32)">D2</th><td style="text-align:left">=LOOKUP(<font color="Blue">B2,rGrades</font>)</td></tr><tr><th width="10px" style=" background-color: rgb(218,231,245);color: rgb(22,17,32)">E2</th><td style="text-align:left">=LOOKUP(<font color="Blue">B2,rGrades</font>)</td></tr></tbody></table></td></tr></table><br /><table width="85%" cellpadding="2.5px" rules="all" style=";border: 2px solid black;border-collapse:collapse;padding: 0.4em;background-color: rgb(255,255,255)" ><tr><td style="padding:6px" ><b>Workbook Defined Names</b><table cellpadding="2.5px" width="100%" rules="all" style="border: 1px solid;text-align:center;background-color: rgb(255,255,255);border-collapse: collapse; border-color: rgb(187,187,187)"><thead><tr style=" background-color: rgb(218,231,245);color: rgb(22,17,32)"><th width="10px">Name</th><th style="text-align:left">Refers To</th></tr></thead><tbody><tr><th width="10px" style=" background-color: rgb(218,231,245);color: rgb(22,17,32)">rGrades</th><td style="text-align:left">=Sheet1!$F$1:$G$12</td></tr></tbody></table></td></tr></table><br />
 
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