Budget Calculator

How this calculator works

The calculator adds every income source into one monthly total, then subtracts your fixed expenses, variable expenses, planned savings and debt payments. What remains is your surplus — or, if the number is negative, the size of your monthly shortfall.

It also shows two percentages that matter more than the raw totals: the share of income committed to spending, and the share going to savings. Tracking those two figures month to month tells you whether your situation is improving even when the balance looks similar.

The formula

Remaining = Total income − (Fixed expenses + Variable expenses + Savings + Debt payments). The daily figure divides a positive remaining amount across 30 days.

Worked example

Income of 24,000, fixed costs of 11,500, variable spending of 5,800, savings of 2,000 and debt payments of 1,900 gives total outgoings of 21,200 and a surplus of 2,800 — roughly 93 a day. The savings rate is about 8 percent, which is a reasonable starting point but leaves room to improve.

Why this calculation is useful

Most people know their income and their rent but have never added everything together in one place. Seeing the full picture usually reveals either a surplus that was quietly disappearing or a shortfall that explains a slowly growing credit balance.

Common mistakes to avoid

• Using gross salary instead of the amount that actually lands in your account.
• Leaving out annual costs such as insurance excesses, licensing and festive spending.
• Estimating variable spending from memory rather than from three months of statements.
• Treating savings as whatever is left over instead of a planned outgoing.
• Forgetting irregular but predictable costs like maintenance and medical co-payments.