Finance Calculators(16)
Loans, compound interest, investment returns and more
Loan Calculator
Calculate monthly payments and total interest for equal payment or equal principal loans.
Compound Interest Calculator
Calculate investment returns using compound interest.
Savings Calculator
Calculate maturity amount and interest for monthly savings deposits.
Deposit Calculator
Calculate fixed deposit maturity interest and after-tax returns.
Exchange Rate Calculator
Calculate exchange rates between KRW and major currencies.
Annuity Calculator
Calculate annuity payments and savings goals.
Break-Even Calculator
Calculate break-even point from fixed costs, variable costs and selling price.
Investment Return Calculator
Calculate total returns and yield from initial investment.
Retirement Savings Calculator
Calculate retirement living expenses and savings goals.
Stock Return Calculator
Calculate stock returns from buy and sell prices.
Dividend Yield Calculator
Calculate dividend yield and after-tax income.
Mortgage Refinance Calculator
Compare loans to analyze refinancing benefits.
Emergency Fund Calculator
Calculate emergency fund target.
Debt Payoff Calculator
Calculate debt payoff timeline and total interest.
Inflation Calculator
Calculate inflation impact on purchasing power.
Youth Future Savings Calculator
Calculate government contribution and maturity amount for Youth Future Savings.
Overview
Our finance calculator collection lets you easily perform a wide range of financial calculations, including loan interest, compound interest simulations, and investment return analysis. Check your monthly mortgage or personal loan repayments in advance, and accurately calculate the maturity amount of savings deposits based on compound interest. Compare expected returns across stocks, funds, and ETFs, and instantly see the difference between equal principal and equal installment repayment methods. From retirement planning and emergency fund goal-setting to calculating interest savings from early loan repayment, these essential tools support smarter financial decisions. Designed so anyone can use them without knowing complex financial formulas.
Tips
- ✔When comparing loans, always check the total interest paid, not just the interest rate. The total interest can vary significantly depending on the repayment method, even at the same rate.
- ✔Use the compound interest calculator to see the power of long-term investing. At a 7% annual return, a 30-year investment grows to roughly 7.6 times the principal.
- ✔Equal installment repayment makes monthly budgeting easier with fixed payments, while equal principal repayment results in lower total interest over the loan term.
- ✔When calculating investment returns, always base your decisions on net returns (real returns) that include taxes and fees.
- ✔Set your emergency fund target at 3 to 6 months of living expenses and use the calculator to project when you will reach your goal.
- ✔When considering early loan repayment, compare the prepayment penalty against the interest savings to determine the actual benefit.
- ✔Use a pension calculator to identify the exact monthly living expenses you will need after retirement and set a concrete current savings target.
FAQ
Q. What is the difference between equal installment and equal principal repayment?
With equal installment repayment, the monthly payment (principal plus interest) stays the same, making budgeting straightforward. With equal principal repayment, you pay a fixed amount of principal each month while the interest portion decreases as the balance shrinks. The initial payments are higher, but the total interest paid over the loan term is lower. The longer the loan term, the larger the difference in total interest between the two methods, so it is worth comparing them with a calculator.
Q. How does compound interest differ from simple interest?
Simple interest is calculated only on the original principal, while compound interest is calculated on the principal plus all previously accumulated interest. For example, depositing 10 million won at 5% annually for 10 years yields 15 million won with simple interest and approximately 16.29 million won with compound interest. The longer the investment period, the more dramatically compound interest outpaces simple interest.
Q. What should I watch out for when calculating loan interest?
It is important to distinguish between the nominal interest rate and the effective interest rate. The nominal rate is the stated rate, while the effective rate includes fees and associated costs, reflecting the true cost. When comparing loans, consider the debt service ratio (DSR), prepayment penalties, and guarantee fees together for a complete picture.
Q. How do I calculate investment returns?
The basic formula is (selling price minus purchase price plus dividends) divided by purchase price times 100. However, to fairly compare investments held for different periods, use the compound annual growth rate (CAGR). For the most accurate comparison, calculate net returns after deducting taxes and transaction fees.
Q. Is a lump-sum deposit or an installment savings plan more advantageous?
If you already have a lump sum, a fixed deposit is better because interest accrues on the entire amount from day one. If you save a fixed amount each month, an installment savings plan is the appropriate choice. At the same interest rate, a fixed deposit earns roughly twice the total interest of an installment plan because the average deposit period of monthly contributions is shorter.
Q. What is the Rule of 72?
The Rule of 72 is a quick formula for estimating how long it takes for an investment to double. Divide 72 by the annual rate of return to get the approximate number of years. For example, at a 6% annual return, it takes about 72 divided by 6, which equals 12 years. It is a very useful rule for intuitively understanding the power of compound interest.
Q. Is early loan repayment always a good idea?
Not necessarily. Prepayment penalties, typically 1 to 1.5 percent within the first three years, may apply. If you have access to investments that yield more than your loan interest rate, investing may be more beneficial. Compare your remaining loan term, interest rate, prepayment penalty, and alternative investment returns before making a decision.
Related Categories
You can plan loan repayment capacity and savings goals based on your net take-home pay.
Calculating taxes on investment income, such as financial income tax and capital gains tax, helps you determine your true net returns.
When analyzing real estate purchases and rental yields, you need to factor in financial costs such as loan interest and acquisition taxes.
Financial calculations are essential for business operations, including funding, working capital management, and return-on-investment analysis.