Calculators
Precise calculations. Calm decisions.
From returns and compounding to trading, portfolios and retirement. Run the calculations you need for investing right in your browser.
Returns & compounding
Put a number on what time earns you.
Compounding, DCA, dividend reinvestment and currency effects. Preview the outcome of long-term investing.
Compound Interest Calculator
Calculate how much your principal and monthly contributions grow with compounding, and how much you need each month to reach a target amount.
DCA Calculator
What if you had invested steadily every month in the KOSPI, S&P 500, Samsung Electronics or Bitcoin? Simulated with actual historical data.
Returns & CAGR Calculator
Instantly convert period returns into annualized returns (CAGR), and annual returns into period returns.
Dividend Reinvestment (DRIP) Calculator
Calculate future dividends and assets including after-tax dividends, dividend growth and the effect of reinvestment.
FX Return Calculator
Splits your won-based return on US stocks into stock-price return and FX gains or losses.
Leveraged ETF Negative Compounding Simulator
Simulate for yourself why 2x and 3x leveraged ETFs lose money in a sideways market.
Trading
Every trade, as planned.
Average price, break-even gain, right-sized quantity and margin call price. Check before you place an order.
Averaging-down (Average Price) Calculator
Calculate your new average price after buying more, and how many shares you need to reach a target average price.
Break-even Calculator
A -50% loss needs a +100% gain. See at a glance the gain required to break even for each loss rate.
Position Sizing Calculator
Calculate the right number of shares for this trade from your acceptable loss relative to your account and your stop-loss price.
Margin Call Price Calculator
If you bought on margin, see in advance how far the price can fall before you hit a collateral shortfall and forced liquidation.
Rights Offering & CB Dilution Calculator
Calculate how much your ownership stake and the share price get diluted when a rights offering or CB conversion happens.
IPO Allocation Estimator
Calculate how many shares you could receive under equal and proportional allocation, and how much subscription margin you need.
Portfolio
A portfolio is about balance.
Check rebalancing, ETF overlap, dividend income and broker costs all at once.
Rebalancing Calculator
Enter your target weights and it tells you how many shares of each stock to buy or sell.
ETF Overlap Analyzer
If you hold several ETFs, this adds them up to show which stocks you are actually concentrated in and by how much.
Dividend Paycheck Planner
Combine stocks so dividends arrive every month and build a monthly after-tax dividend calendar.
Broker Fees & FX Comparison
Compare overseas stock fees and exchange discounts at 10 brokers and calculate your annual cost based on your own trading.
Retirement
How far you are from financial freedom.
Calculate the assets you need, when you could reach them, and how your assets evolve after retirement.
Retirement & FIRE Calculator
Use the 4% rule to calculate the retirement assets you need, the age you could reach financial freedom, and how your assets evolve after retirement.
Severance Pay Calculator
Calculate severance pay from your hire date, leave date and last 3 months of wages, and compare retirement income tax and the tax savings from receiving it as an IRP pension.
National Pension Estimate Calculator
Estimate your old-age pension, and the amounts for early or deferred payment, from birth year, contribution period and average income, using 2026 rules.
Salary & living
Start with your paycheck and everyday numbers.
Accurately calculate the numbers you face every month, such as take-home pay, deposit and savings interest, and currency exchange costs.
Take-home Pay Calculator
Calculate monthly take-home pay and deductions for an annual salary or monthly pay, using 2026 social insurance rates and the National Tax Service simplified withholding table.
Deposit & Savings Interest Calculator
Calculate pre-tax and after-tax interest, maturity payout and the actual yield of time deposits and installment savings.
FX Converter
Convert 12 currencies, including the dollar, yen and euro, into won, and see the real cost based on cash and wire transfer rates and exchange rate discounts.
Loans & real estate
Run the numbers on loans and homes first.
Calculate interest by repayment method, your DSR limit and the maximum brokerage fee before you sign a contract.
Loan Interest Calculator
Compare monthly payments and total interest for three repayment methods at once: equal principal and interest, equal principal, and bullet (lump sum at maturity).
DSR Calculator
Calculate your DSR from your existing loans and annual income, and estimate your additional mortgage limit with Stress DSR applied.
Real Estate Brokerage Fee Calculator
Calculate the statutory maximum brokerage fee from the sale, jeonse or monthly rent transaction amount. It includes monthly rent conversion and VAT.