貯蓄目標の設定と達成
明確な貯蓄目標とスケジュールを設定すると、モチベーションを維持し計画通りに進めることができます。
How to Use the Savings Goal Calculator
Enter your target savings amount, how much you have saved so far, the amount you plan to deposit each month, and the expected annual return on your savings or investments. The calculator shows how many months until you reach your goal, considering compound growth on your deposits.
The Math Behind Savings Goals
The calculator uses the future value of an annuity formula combined with compound interest on existing savings. Each month, your balance grows by the monthly interest rate and receives a new deposit. The monthly rate is derived from the annual rate: (1 + annual rate)^(1/12) - 1. Even small monthly deposits grow significantly with compound returns over time.
Frequently Asked Questions
What return rate should I use for savings goals?
For short-term goals (1-3 years), use your savings account or money market rate (typically 3-5%). For medium-term goals (3-7 years), a balanced portfolio might return 5-7%. For long-term goals (7+ years), stock market historical returns of 7-10% are reasonable. Always use conservative estimates to avoid falling short.
How can I reach my savings goal faster?
Three levers: increase monthly deposits (even small increases compound over time), seek higher returns (within your risk tolerance), and reduce the goal amount by finding ways to lower the cost. Automating your deposits on payday eliminates the temptation to skip months — consistency is the most powerful factor in reaching savings goals.