Forecasting Accuracy Model


New Member
Apr 11, 2018
Hi all,

First time posting so apologies if I'm not overly clear.

I've been set a task that is bending my brain a little bit -

The document has 3 tabs - Historical Calls, Forecast Calls, Accuracy

-Historical Calls - actual data
-Forecast Calls - historical data which is either like for like, or daily total/ % share of that time interval
-Accuracy - historical / forecast %

What I need to do is, first let forecast be calculated based on the data I have in the actuals & sums behind it, but for that forecast to be then 'locked in' 3-month intervals with the data I have, regardless of if I continue to add new actual data.

Essentially we need to use the actuals to fuel the forecast, but then be able to measure the accuracy of this (without additional data constantly updating the forecast)

Currently, if I add any new actual data, it updates the forecasts I've already calculated

The only solution I've got so far is one the forecast is originally generated, copy and paste the values over the top as figures removing the formula.... which is a workaround but not a long-term solution.

-Is there a simple tweak to the formulas behind the forecasts to stop them updating once calculated?

Thanks for any help! Sorry if this doesn't make sense - I'm having trouble making sense of the issue, to begin with!

Some videos you may like

Excel Facts

Last used cell?
Press Ctrl+End to move to what Excel thinks is the last used cell.


Well-known Member
Dec 15, 2014
You can use a change event to paste values when a formula updates a value it will call the event

Watch MrExcel Video

Forum statistics

Latest member

This Week's Hot Topics

  • Finding issue in If elseif else with For each Loop
    Finding issue in If elseif else with For each Loop I have tried this below code but i'm getting in Y column filled with W005. Colud you please...
  • MsgBox Error
    Hi Guys, I have the below error show up when i try and run my macro in File1 but works fine if i copy and paste the same code into file2. [ATTACH...
    My Cell Format is [B]""0.00" Cr". [/B]But in the cell, it is showing 123.00 for editing. (123 is entry figure). (Data imported from other...
  • Show numbers nearly the same
    Is this possible. I have a number that can change very time eg 0.00001234 Then I have a lot of numbers 0.0000001, 0.0000002, 0.00000004...
  • Please i need your help to create formula
    I need a formula in cell B8 to do this >>if b1=1 then multiply ( cell b8) by 10% ,if b1=2 multiply by 20%,if=3 multiply by 30%. Thank you in...
  • Got error while adding column and filter
    Got error while adding column and filter In column Z has some like "Success" and "Error". I want to add column in AA if the Z cell value is...