Excel Math

[pclplante]

I need a formula that does this. I have a base number of 300 seconds and want to add 30 seconds to it for every number over 1 so the output would be like this
input 0 and get 0 out
input 1 and get 300 out
input 2 and get 330 out
input 3 and get 360 out
input 4 and get 390 out
and so on. I can't for the life of me get the math down. Can someone please help.

 

[Michael M]

Maybe
<b>Excel 2003</b><table cellpadding="2.5px" rules="all" style=";background-color: #FFFFFF;border: 1px solid;border-collapse: collapse; border-color: #A6AAB6"><colgroup><col width="25px" style="background-color: #E0E0F0" /><col /><col /></colgroup><thead><tr style=" background-color: #E0E0F0;text-align: center;color: #161120"><th></th><th>A</th><th>B</th></tr></thead><tbody><tr ><td style="color: #161120;text-align: center;">1</td><td style=";">Value</td><td style=";">Result</td></tr><tr ><td style="color: #161120;text-align: center;">2</td><td style="text-align: right;;">0</td><td style="text-align: right;;">0</td></tr><tr ><td style="color: #161120;text-align: center;">3</td><td style="text-align: right;;">1</td><td style="text-align: right;;">300</td></tr><tr ><td style="color: #161120;text-align: center;">4</td><td style="text-align: right;;">12</td><td style="text-align: right;;">630</td></tr><tr ><td style="color: #161120;text-align: center;">5</td><td style="text-align: right;;">3</td><td style="text-align: right;;">360</td></tr><tr ><td style="color: #161120;text-align: center;">6</td><td style="text-align: right;;">4</td><td style="text-align: right;;">390</td></tr><tr ><td style="color: #161120;text-align: center;">7</td><td style="text-align: right;;">5</td><td style="text-align: right;;">420</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 #A6AAB6;border-top:none;text-align: center;background-color: #E0E0F0;color: #161120">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: #FFFFFF" ><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: #FFFFFF;border-collapse: collapse; border-color: #A6AAB6"><thead><tr style=" background-color: #E0E0F0;color: #161120"><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: #E0E0F0;color: #161120">B2</th><td style="text-align:left">=IF(<font color="Blue">A2=0,0,IF(<font color="Red">A2=1,300,300+(<font color="Green">A2-1</font>)*30</font>)</font>)</td></tr><tr><th width="10px" style=" background-color: #E0E0F0;color: #161120">B3</th><td style="text-align:left">=IF(<font color="Blue">A3=0,0,IF(<font color="Red">A3=1,300,300+(<font color="Green">A3-1</font>)*30</font>)</font>)</td></tr><tr><th width="10px" style=" background-color: #E0E0F0;color: #161120">B4</th><td style="text-align:left">=IF(<font color="Blue">A4=0,0,IF(<font color="Red">A4=1,300,300+(<font color="Green">A4-1</font>)*30</font>)</font>)</td></tr><tr><th width="10px" style=" background-color: #E0E0F0;color: #161120">B5</th><td style="text-align:left">=IF(<font color="Blue">A5=0,0,IF(<font color="Red">A5=1,300,300+(<font color="Green">A5-1</font>)*30</font>)</font>)</td></tr><tr><th width="10px" style=" background-color: #E0E0F0;color: #161120">B6</th><td style="text-align:left">=IF(<font color="Blue">A6=0,0,IF(<font color="Red">A6=1,300,300+(<font color="Green">A6-1</font>)*30</font>)</font>)</td></tr><tr><th width="10px" style=" background-color: #E0E0F0;color: #161120">B7</th><td style="text-align:left">=IF(<font color="Blue">A7=0,0,IF(<font color="Red">A7=1,300,300+(<font color="Green">A7-1</font>)*30</font>)</font>)</td></tr></tbody></table></td></tr></table><br />

 

[Ron Coderre]

With
A1: a whole number, greater than or equal to zero

This regular formula returns the values you indicated:
B1: =(A1>0)*(300+(A1-1)*30)

Is that something you can work with?

 

[pclplante]

Yes thank you. I've been looking at the spreadsheet for hours when I just needed a break. Thanks again.