Finance Calc Kit

What is the 70-20-10 rule?

The 70-20-10 rule is a percentage-based budgeting method that splits your after-tax take-home pay into three buckets: 70% for living expenses, 20% for savings and investments, and 10% for extra debt payments or donations. This calculator applies those percentages to your income and can compare the targets to what you actually spend. All math runs in your browser.

Enter your monthly or annual after-tax income to see the three target amounts. Turn on the comparison toggle to enter actual spending in each category and see where you are over or under the guideline. If you prefer separating needs from wants, the 50-30-20 rule budget calculator uses a 50% needs, 30% wants, and 20% savings split instead. To itemize your actual spending by housing, food, transportation, and health categories, use the budget calculator. For mortgage qualification limits based on gross income, try the 28/36 rule calculator. Once you know how much room is left for retirement, the 401k calculator can project how employer match and returns grow that savings bucket over time. To trim recurring leaks inside your living bucket, run a subscription audit with the subscription waste calculator.

How the percentages are calculated

Each category is a fixed share of monthly take-home pay. Annual income is converted to a monthly figure first. On $4,000 of monthly take-home pay, the rule allocates $2,800 to living expenses, $800 to savings, and $400 to debt and donations.

\text{Living} = 0.70 \times I \quad \text{Savings} = 0.20 \times I \quad \text{Debt \& donations} = 0.10 \times I

I is your monthly take-home pay after taxes and payroll deductions. The three shares always add up to 100% of that income. The rule is a template, not a strict mandate. You can shift percentages when essentials cost more in your area or when you are prioritizing debt payoff.

What counts in each bucket

Living expenses cover both essentials and discretionary spending: rent or mortgage, utilities, groceries, insurance, transportation, minimum required debt payments, dining out, and entertainment. Savings and investments include emergency fund contributions, retirement accounts, and long-term investing. The final bucket covers extra debt payments above required minimums and charitable giving.

Comparing targets to actual spending

When you enable the comparison, the calculator subtracts each target from your actual amount in that category. A positive difference in living expenses means you spent more than the guideline. A negative difference in savings means you saved less than the 20% target. If your total actual spending exceeds take-home pay, the tool flags an over-budget result.

\Delta_{\text{category}} = \text{Actual spending} - \text{Target budget}

Frequently asked questions

Should I use gross or net income?

Use after-tax take-home pay. The 70-20-10 rule is defined on net income, the amount that actually lands in your bank account each month.

What goes in the 70% living expenses bucket?

Living expenses include both needs and wants: housing, groceries, transportation, insurance, minimum debt payments, dining out, subscriptions, and other day-to-day spending.

What goes in the 20% savings bucket?

The 20% bucket covers emergency fund savings, retirement contributions, and long-term investments.

What goes in the 10% bucket?

The 10% bucket is for extra debt payments above required minimums and charitable donations. Minimum payments already count toward the 70% living bucket.

How does this differ from the 50-30-20 rule?

The 50-30-20 rule separates needs (50%) from wants (30%) and combines savings with extra debt payoff (20%). The 70-20-10 rule combines needs and wants into one 70% bucket and keeps savings (20%) separate from extra debt and donations (10%).

Are the results stored?

No. Changing the fields only updates the page URL so you can copy and share your inputs.

Resources and references

The formulas and methods in this calculator were checked against these independent sources.