Know Your Real Savings Capacity Before Budgeting
Many people underestimate their fixed costs and overestimate how much they can save. This calculator breaks your expenses into clear categories — housing, food, transport, phone, and other fixed costs — so you can see exactly how much remains for saving and investing after the non-negotiables are covered.
The 50/30/20 rule is a common guideline: 50% of take-home pay for needs, 30% for wants, and 20% for savings. If your fixed expenses alone exceed 70% of income, it's a signal to reassess housing or recurring subscriptions. Reducing one large fixed expense — like finding cheaper rent or refinancing a car loan — typically saves more than cutting many small variable expenses.
Note that this calculator covers fixed expenses only. Variable spending (dining out, shopping, entertainment) will further reduce your actual savings. The figure here represents your theoretical maximum savings floor, not a guaranteed monthly surplus.
Frequently Asked Questions
If your 401(k) is deducted from your paycheck before you receive it, it's already excluded from take-home pay — so no. If you contribute manually after receiving pay, include it under "Other Fixed" to see it reflected in your savings rate.
The fastest wins come from reducing the largest fixed expenses: housing, car payments, and insurance. Negotiate rent, refinance debt, and compare insurance annually. These one-time changes compound month after month.