Find out how much time and interest you save with extra payments. Compares 3 strategies: monthly extra, yearly extra, and one-time lump sum. Free 2026 calculator.
On a $300K mortgage at 6.5% with 30 years left, an extra $100/mo saves $50K+ in interest and pays off 4 years earlier. Doubling extra payments to $200/mo saves $80K+ and 7 years earlier. The key: even small extras compound significantly over time.