Extrapolating 15min, to 10min data- help?

Hi
Try this formula in E3 and copy down

Formula:

=FORECAST(D3,OFFSET($B$2,MATCH(D3,$A$3:$A$2643,1),0,2,1),OFFSET($A$2,MATCH(D3,$A$3:$A$2643,1),0,2,1))

Hi Jose,

Thank you very much, that has done it!

Alex