Budget Calculator
How should you allocate your income? Use the 50/30/20 rule for instant allocation, build a custom budget with your own categories, or enter actual spending to find your surplus or deficit. Works with any currency.
30% Wants: Dining out, entertainment, shopping, subscriptions, hobbies, travel
20% Savings & Debt: Emergency fund, retirement, extra debt payments, investments
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How to Use This Calculator
Tab “50/30/20 Budget”
Enter your after-tax monthly income (take-home pay). The calculator instantly allocates 50% to needs, 30% to wants, and 20% to savings and debt repayment, showing dollar amounts for each category.
Tab “Custom Budget”
Enter your income, then create your own categories with target percentages. The calculator shows the dollar amount for each category and flags whether your total allocation is over or under 100%. Add up to 12 categories.
Tab “What’s Left”
Enter your income and all actual monthly spending across needs, wants, and savings categories. The calculator shows your surplus or deficit, percentage breakdown for each group, and compares your spending against the 50/30/20 benchmark.
The 50/30/20 Rule
Wants (30%): Dining out, entertainment, shopping, subscriptions, hobbies, travel
Savings & Debt (20%): Emergency fund, retirement contributions, extra debt payments, investments
Formula: Category Amount = Monthly After-Tax Income × Category Percentage
The 50/30/20 rule was popularized by Senator Elizabeth Warren and her daughter Amelia Warren Tyagi in the book “All Your Worth: The Ultimate Lifetime Money Plan” (2005). It provides a simple framework for balancing essential spending, lifestyle spending, and financial security.
Worked Examples
Example 1 — Standard 50/30/20 on $5,000/month
A single professional earning $5,000/month after tax applies the standard 50/30/20 split.
With $2,500 for needs, they can allocate roughly $1,200 for housing, $150 for utilities, $500 for food, $350 for transport, $200 for insurance, and $100 for minimum debt payments.
Example 2 — Overspending on needs: $5,000/month actual spending
Same income, but actual spending is: Needs $3,100 (62%), Wants $1,400 (28%), Savings $500 (10%).
Needs are $600 over the 50% benchmark, leaving only $500 for savings — half the recommended 20%. Reducing housing or transport costs would free up money for savings.
Example 3 — Aggressive saver: $8,000/month, 40/20/40 split
A high earner chooses an aggressive custom budget: 40% needs, 20% wants, 40% savings and investments.
By keeping wants at just 20% and needs at 40%, they direct $3,200/month toward savings — an aggressive path toward financial independence or early retirement.
Understanding Budget Allocation
Why the 50/30/20 Rule Works
The rule works because it is simple enough to follow consistently. Rather than tracking every dollar across dozens of categories, you only need to manage three buckets. If your needs stay under 50%, your wants under 30%, and you save at least 20%, you are building financial security while still enjoying life.
Needs vs Wants: The Key Distinction
Needs are expenses you must pay regardless of lifestyle choices: rent or mortgage, electricity, groceries, getting to work, health insurance, and minimum loan payments. Wants are everything else that improves your quality of life but is not strictly necessary: restaurants, streaming services, new clothes, vacations. The line can be blurry — a basic phone is a need, but the latest flagship is a want.
When to Adjust the Percentages
The 50/30/20 split is a starting point, not a law. In high-cost cities, needs may require 60% or more. If you have aggressive savings goals (FIRE, early retirement), you might push savings to 30-50% and reduce wants. If you are debt-free with a full emergency fund, you might shift more toward wants or investments. The Custom Budget tab lets you build any split that matches your situation.
Limitations
The 50/30/20 rule assumes a stable after-tax income. Irregular income (freelancers, commission-based roles) may need a different approach such as budgeting from the lowest expected month. The rule also does not account for regional cost-of-living differences — 50% for needs in San Francisco looks very different from 50% in rural areas.