Interactive budget and borrowing cost calculator showing how variable costs and interest add up

Your monthly bills are a ticking clock that never stops

Most people think they know where their money goes — until they actually track it. Fixed costs are locked in, variable costs creep up, and borrowing quietly multiplies everything. Drag the slider to watch your monthly outflow grow in real time.

Monthly Budget Breakdown Balance: +$0
Slide to increase variable spending (food, transport, extras)
Total Outflow: $0/month
$200 $700 $1200
Money Left $1200
% of Income 40%
You buy a $1200 laptop on a credit card with 19% annual interest. If you only pay the minimum ($50/month), you'll take over two years to pay it off — and you'll pay around $300 extra in interest alone. That laptop actually cost you $1500. Credit cards are designed for convenience, but the interest compounds daily, turning small purchases into long-term debt traps if you don't clear the balance fast.
Know This

A budget tracks income against fixed costs (rent, insurance) and variable costs (food, petrol) — borrowing always adds interest on top of the original amount.