# Cumulative sales Forecast Formula

#### Anderson 123

##### New Member
I have a year end sale figure of £80,000 and want to divide this between 12 months in way that starts from Jan to Dec, and the Jan Sale not to be less than £4,000 and each month the sale increase slightly with a few fluctuations in Sep, Feb and March when there is seasonality and the sales are slow.

The total of all 12 months should add up to £80,000. is there an formula that forecasts the sales amounts in each month for me?

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#### DRSteele

##### Well-known Member
Welcome to the forum.

This becomes too complex if you try to use formulas. This is more straightforward if you use Solver, which is an Add-in for Excel. Do you want to know how to do that?

#### Anderson 123

##### New Member
Welcome to the forum.

This becomes too complex if you try to use formulas. This is more straightforward if you use Solver, which is an Add-in for Excel. Do you want to know how to do that?
No, I appreciate if you let me know how to do it step by steps .. many thanks!!!!

#### DRSteele

##### Well-known Member
Huh? "No", you don't want to know how to do that?

Let's just try this for starters.

I created an algorithm that lays out the sales figures. There are growth factors applied to certain months (10% growth here for each of the months May, Jun, Jul, Aug, Oct, Nov, Dec); three of the other months have seasonality factors (C3,D3,E3,&J3) that reduce sales (Feb 20%, then Mar 5%; Sep 10%). You can alter those figures and then adjust B7 until the total sums to near 80,000 in N7. That should be good enough.

ABCDEFGHIJKLMN
3growth/seasonality0.80000.95001.10001.10001.10001.10001.10000.90001.10001.10001.1000
4
5
6JanFebMarAprMayJunJulAugSepOctNovDecYear
7Sales6261.595009.274758.775234.655758.116333.926967.317664.056897.647587.408346.159180.7679999.62

<tbody>
</tbody>
Sheet6

Worksheet Formulas
CellFormula
F3=E3
G3=F3
H3=G3
I3=H3
K3=I3
L3=K3
M3=L3
C7=B7*C3
D7=C7*D3
E7=D7*E3
F7=E7*F3
G7=F7*G3
H7=G7*H3
I7=H7*I3
J7=I7*J3
K7=J7*K3
L7=K7*L3
M7=L7*M3
N7=SUM(B7:M7)

<tbody>
</tbody>

<tbody>
</tbody>

#### Anderson 123

##### New Member
Thank you so much . This is very nice of you but can you Tell me how you created the algorithm or how you do the add-in to excel? I need to use this feature many times in the future !!

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