Choose a Product

Oil / Gas

Default Units

bbls for oil / mmcf for gas

Choose a Decline Method

exponential / hyperbolic / harmonic

Enter Decline %

Usually a number between 0 and 100;
A negative number represents an increase rather than a decline

Enter N for hyperbolic decline only

Usually between 0 and .7;
Controls the shape of the curve

Enter an Initial Rate

( in default units)

Choose the time unit for the initial rate

months / years

Choose an Ending Condition

time / ending rate / reserves

Choose an Ending Unit

Time (months / years)
Ending Rate ( /day, /month / year)
Reserves ( default units)

Enter a value for the Ending Condition chosen

Click Calculate

The initial calculation may take a minute while the application loads.