Batch-grade money math.
Compound growth, loan amortization and savings plans — computed by a real GnuCOBOL program, rounded half-away-from-zero at the cent level, the way a mainframe batch posts it.
GnuCOBOL 3.1.2
integer cents
offline PWA
Console log
Job history
Why COBOL?
COBOL still moves trillions every day, and its fixed-point decimal arithmetic is exactly right for money: no float drift, ever. This demo ships the actual compiled program's behavior — same rounding rule, same integer-cents ledger discipline your bank's batch window uses.
Read the COBOL engine source →