A debt snowball and avalanche tracker that turns a pile of balances into a clear plan: the exact order to attack your debts, the month you become debt-free, the total interest you will pay, and a full month-by-month schedule you can export. It is built for anyone juggling credit cards, store cards, car finance or personal loans who wants one honest picture of how long the climb really is — and how much faster an extra payment gets them out.
How it works
You list each debt with three numbers: its current balance, its APR (annual interest rate) and the minimum payment your lender demands. You then add an extra monthly payment — anything you can spare above the minimums. The tracker simulates your finances one month at a time. Each month it charges interest on every outstanding balance, pays the required minimum on each debt, then funnels every leftover penny at a single target debt chosen by your strategy.
In snowball mode the target is the smallest balance, clearing whole debts quickly for momentum. In avalanche mode the target is the highest APR, killing your most expensive interest first. The moment a debt hits zero, its old payment rolls into the pool and supercharges the next target — that rolling, growing payment is the snowball effect. The simulation repeats until every balance is cleared, recording your debt-free date, total interest and the month each individual debt disappears.
Because the tool runs both strategies on the same inputs, the comparison panel shows you precisely how much interest and time each one costs, so the choice is informed rather than guessed. A live chart plots both payoff curves so you can see the difference at a glance, and the whole schedule exports to CSV for your own spreadsheet.
Example
Say you owe a £3,200 credit card at 21.9%, a £6,800 car loan at 6.4%, and a £950 store card at 27.9%, with minimums of £80, £180 and £25. Add a £150 extra payment and the snowball clears the store card first, then the credit card, then the car loan — debt-free in a little over three years. Switch to avalanche and it hits the 27.9% store card and 21.9% card first, saving a chunk of interest while finishing around the same time. The comparison panel shows the exact pound difference so you can pick with eyes open.
Every figure is computed in your browser. No balances, rates or payments are ever uploaded.