CalcJoy

What does $100 extra/month on debt do?

Answer
On a $10,000 balance at 20% APR, going from $300/month → $400/month cuts payoff from ~50 months to ~33 months and saves roughly $1,650 in interest.

Assumptions

  • $10,000 starting balance
  • 20% APR (fixed)
  • Base payment: $300/month
  • Extra payment scenario: $400/month
  • No new charges added

Calculation

$300/mo → ~49.1 months · Total ≈ $14,716 · Interest ≈ $4,716
$400/mo → ~32.6 months · Total ≈ $13,050 · Interest ≈ $3,050
Savings: ~17 months and ~$1,666 interest

Try the full calculator

Customize hours, weeks, rates, or amounts to fit your situation.

Open Debt Payoff Calculator →

Related answers

Related calculators

money

Credit Card Payoff Calculator

High-APR payoff time and interest cost.

money

Debt Snowball Calculator

Smallest-balance-first payoff plan.

money

Debt Avalanche Calculator

Highest-interest-first payoff plan.

Frequently asked

Why does an extra $100 help so much?

Extra payments go straight to principal, so each future month accrues less interest — compounding in your favor.

Does it matter when in the month I pay?

Slightly. Paying earlier in the cycle reduces the average daily balance and trims a bit more interest.

Estimates only. Figures are before taxes and deductions unless noted.