Rules inside the plan

Money Rule Calculators

Quick calculator-backed rules for budgeting, compounding time, debt load, retirement withdrawals, car affordability, and money habits.

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Common starting points

50/30/20 Rule CalculatorGlobalSplit monthly income into needs, wants, and savings using the beginner-friendly 50/30/20 budgeting rule.

Rule of 72 CalculatorGlobalEstimate how many years it may take money to double at a given annual return, or the return needed for a target doubling time.

Emergency Fund CalculatorGlobalEstimate a 3, 6, 9, or 12 month emergency fund target and current savings shortfall.

70/20/10 Rule CalculatorGlobalSplit monthly income into living expenses, savings or investments, and debt repayment or giving.

Zero-Based Budget CalculatorGlobalCheck whether your monthly income is fully assigned across expenses, savings, investments, and debt payments.

Rule of 114 CalculatorGlobalEstimate how long money may take to triple at a selected annual return.

Full calculator list

All money rule calculators

50/30/20 Rule CalculatorGlobalSplit monthly income into needs, wants, and savings using the beginner-friendly 50/30/20 budgeting rule.

70/20/10 Rule CalculatorGlobalSplit monthly income into living expenses, savings or investments, and debt repayment or giving.

Zero-Based Budget CalculatorGlobalCheck whether your monthly income is fully assigned across expenses, savings, investments, and debt payments.

Rule of 72 CalculatorGlobalEstimate how many years it may take money to double at a given annual return, or the return needed for a target doubling time.

Rule of 114 CalculatorGlobalEstimate how long money may take to triple at a selected annual return.

Rule of 144 CalculatorGlobalEstimate how long money may take to quadruple at a selected annual return.

100 Minus Age Rule CalculatorGlobalEstimate a basic equity and debt allocation using 100, 110, or 120 minus age with risk profile adjustments.

Investment Doubling CalculatorGlobalProject whether an investment may double within your selected period and estimate the doubling year.

Emergency Fund CalculatorGlobalEstimate a 3, 6, 9, or 12 month emergency fund target and current savings shortfall.

Savings Rate CalculatorGlobalCalculate your savings rate from monthly income, savings, and investments.

Debt-to-Income Ratio CalculatorGlobalCalculate monthly debt-to-income ratio and understand the risk category.

28/36 Rule CalculatorGlobalEstimate home affordability using the 28% housing and 36% total debt rule.

20/4/10 Car Affordability CalculatorGlobalCheck whether a car purchase fits the 20% down, 4-year loan, and 10% monthly income rule.

Debt Snowball vs Debt Avalanche CalculatorGlobalCompare debt snowball and debt avalanche payoff estimates for up to three debts.

Related categories

Budgeting & Saving Calculators

Use budget, emergency fund, savings rate, and savings-goal calculators to turn income, expenses, and goals into clearer monthly allocations.

Investment Calculators

Calculator-backed tools for SIP, lump sum investing, compound interest, recurring investments, CAGR, ROI, FD, RD, PPF, and compounding assumptions.

Loan Calculators

Estimate EMI, total interest, loan prepayment, part-payment impact, home-loan affordability, and debt pressure without changing the underlying calculator detail pages.

Educational disclaimer

This website provides calculators, educational tools, and general personal finance information. Results are estimates based on user-provided assumptions. This website does not provide financial, investment, tax, legal, or insurance advice. Please consult a qualified professional before making important financial decisions.