# Predicting when a value will occur

#### eup310

##### New Member
I'm trying to predict as accurately as possible. on what day a certain value will be reached.
The example I will use is recording the mileage driven on a daily basis. There will be days when a vehicle is driven more and some days, it may not be driven at all. Assuming I collect the mileage every day for x number of days, is there a way I can predict (approximately) which day I will need to change the oil at 3000 miles?
I realize that over time, the prediction would be more accurate but is there a formula I can use to do this?

### Excel Facts

Square and cube roots
The =SQRT(25) is a square root. For a cube root, use =125^(1/3). For a fourth root, use =625^(1/4).

#### Sulprobil

##### Board Regular
The FORECAST (or FORECAST. LINEAR) function in Excel predicts a future value along a linear trend. The FORECAST. ETS function in Excel predicts a future value using Exponential Triple Smoothing, which takes into account seasonality.

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