Fast Growing Hierarchy Calculator ((new)) May 2026

) used in mathematical logic and "googology" to classify growth rates. It is defined by three primary rules: (the successor function). Successor Step: fαf sub alpha recursively Limit Step: for limit ordinals, where α[n]alpha open bracket n close bracket -th term of a fundamental sequence assigned to How an FGH Calculator Works

) to see how the function expands. Because the actual results are often too large to display as standard digits, these calculators usually provide: Introduction to the fast-growing hierarchy | Googology Wiki fast growing hierarchy calculator

A calculator for this hierarchy allows users to input an ( ) and a natural number ( ) used in mathematical logic and "googology" to