A car loan is term math: the exact same payment can finish 60 months from now or 45 — the difference is how much extra principal you send, and what that extra is worth in interest. Guessing is easy and usually wrong. This calculator runs your real loan five ways at once — minimum only, +$50, +$100, +$200 and YOUR extra — and shows the months, the payoff date and the interest saved for each, with exact amortization math (the final payment is smaller, like real life).
What it does for you:
– Start Here — 5-minute setup: loan amount, APR, original term, first payment date and your extra principal per month; every scenario keys off those numbers.
– Payoff Scenarios — five extra-payment levels side by side: Monthly Payment, Months to Payoff, Payoff Date, Total Interest and Interest Saved vs minimum only, all calculated.
– Extra Payment Log — log the extra principal you actually send (monthly extra, lump sums, tax refunds, bonuses) so plan and reality stay comparable.
– Expense Log — log everyday spending once; the budget reads it automatically.
– Monthly Budget — zero-based monthly budget; Actual pulls from the Expense Log by itself, and over-budget categories flag red.
– Dashboard — base payment, months at minimum vs months with your extra, interest saved and your payoff date at a glance.
– Monthly Summary — 12 months of extra payments in one view.
– Sample rows pre-filled ($25,000 at 6.0% over 60 months: +$150/month extra finishes in 45 months and saves $1,080.58 of interest) so every formula works the moment you open it; formula cells are locked (password disclosed in Start Here) and every formula is error-wrapped. A tracking and planning tool, not financial advice.
What’s inside (.xlsx, works in Excel AND Google Sheets): Start Here · Payoff Scenarios (5 extra levels) · Extra Payment Log · Expense Log · Monthly Budget (zero-based) · Dashboard · Monthly Summary (12 months).
Instant download. No shipping, no waiting. Message us if you need help setting it up — we answer fast.
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