# Cumulative sum with data in unequal increments

#### Chris88kemp

##### New Member
Dear All,

I would like to calculate the cumulative volume of liquid from a pipe over the period of 22 years. Data has been given on a daily basis, however in some instances this covers multiple days.

The format of the native data is as follows:

 DAY LIQUID RATE, M3/D CUMULATIVE VOLUME, M3 1 202 = 202 2 210 = 210 + 202 3 215 = 215 + 210 + 202 13 280 = 280 + (215 * (13 - 3)) + 210 + 202 30 330 = 330 + (280 * (30 - 13))+ (215 * (13 - 3)) + 210 + 202 etc etc etc

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The issue starts on day 3 where the daily flowrate of 215 continues through to day 13, which then increases to 280 per day until day 30.

Does anyone know how this can be neatly calculated in a formula which I can replicate down. The data has 10,000 + rows so adding intermediate rows to cover each individual days is impractical.

### Excel Facts

What does custom number format of ;;; mean?
Three semi-colons will hide the value in the cell. Although most people use white font instead.

#### Fluff

##### MrExcel MVP, Moderator

<b></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 /></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></tr></thead><tbody><tr ><td style="color: rgb(22,17,32);text-align: center;">1</td><td style=";">DAY</td><td style=";">LIQUID RATE, M3/D</td><td style=";">CUMULATIVE VOLUME, M3</td></tr><tr ><td style="color: rgb(22,17,32);text-align: center;">2</td><td style="text-align: right;;">1</td><td style="text-align: right;;">202</td><td style="text-align: right;;">202</td></tr><tr ><td style="color: rgb(22,17,32);text-align: center;">3</td><td style="text-align: right;;">2</td><td style="text-align: right;;">210</td><td style="text-align: right;;">412</td></tr><tr ><td style="color: rgb(22,17,32);text-align: center;">4</td><td style="text-align: right;;">3</td><td style="text-align: right;;">215</td><td style="text-align: right;;">627</td></tr><tr ><td style="color: rgb(22,17,32);text-align: center;">5</td><td style="text-align: right;;">13</td><td style="text-align: right;;">280</td><td style="text-align: right;;">2842</td></tr><tr ><td style="color: rgb(22,17,32);text-align: center;">6</td><td style="text-align: right;;">30</td><td style="text-align: right;;">330</td><td style="text-align: right;;">7652</td></tr></tbody></table><p style="width:5.6em;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)">Planner</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">=B2</td></tr><tr><th width="10px" style=" background-color: rgb(218,231,245);color: rgb(22,17,32)">C3</th><td style="text-align:left">=B2*(<font color="Blue">A3-A2-1</font>)+B3+C2</td></tr></tbody></table></td></tr></table><br />