Guide
Know how it works, and it's more useful.
Every tool comes with instructions, how the calculation works, and frequently asked questions. Pick the tool you need and jump straight in.
Returns & Compounding Calculators
- Compound Interest CalculatorCalculate how much your principal and monthly contributions will grow with compounding, and how much you need each month to reach a target amount.
- DCA CalculatorWhat if you had invested steadily every month in KOSPI, the S&P 500, Samsung Electronics or Bitcoin? Simulated with actual historical data.
- Return & CAGR CalculatorInstantly convert a period return into a compound annual growth rate (CAGR), or an annual return into a period return.
- Dividend Reinvestment (DRIP) CalculatorCalculate future dividends and assets, reflecting after-tax dividends, dividend growth and the effect of reinvestment.
- FX Return CalculatorSplits your won-denominated return on US stocks into stock price gains and currency gains or losses.
- Leveraged ETF Negative Compounding SimulatorSimulate for yourself why 2x and 3x leveraged ETFs lose money in a sideways market.
Trading Calculators
- Averaging-down (Average Cost) CalculatorCalculate what your average cost becomes after buying more, and how many shares you need to reach a target average cost.
- Break-even CalculatorAfter a -50% loss you need +100%. See at a glance the gain needed to break even for each loss rate.
- Position Sizing CalculatorCalculate the appropriate number of shares to buy for this trade from the loss you can tolerate relative to your account and your stop-loss price.
- Margin Call (Forced Liquidation) Price CalculatorIf you bought on credit, check in advance how far the stock price can fall before collateral runs short and forced liquidation occurs.
- Capital Increase & CB Dilution CalculatorCalculate how much your stake and the stock price are diluted when a paid-in capital increase or CB conversion occurs.
- IPO Allocation EstimatorCalculate how many shares you can receive under equal and proportional allocation, and how much deposit you need.
Portfolio Calculators
- Rebalancing CalculatorEnter your target weights and it tells you how many shares of each stock to buy or sell.
- ETF Overlap AnalyzerIf you hold several ETFs, it adds them up to show which stocks you are actually concentrated in and by how much.
- Dividend Paycheck DesignerCombine stocks so that dividends arrive every month, and build a monthly after-tax dividend calendar.
- Broker Fee & FX ComparisonCompare overseas stock fees and FX discounts at 10 brokerages, and calculate your annual cost based on your own trading.
Retirement calculator
- Retirement & FIRE CalculatorUsing the 4% rule, calculate the retirement assets you need, the age you reach financial independence, and your asset flow after retirement.
- Severance Pay CalculatorCalculate severance pay from your hire date, departure date and the last 3 months' wages, and compare severance income tax and the tax saved when taking it as an IRP pension.
- National Pension EstimatorEstimate your expected old-age pension, and the amounts for early or deferred receipt, from birth year, contribution period and average income, on a 2026 basis.
Pay & Living Calculators
- Take-home Pay CalculatorCalculate monthly take-home pay and deductions for an annual salary or monthly wage, using the 2026 social insurance rates and the National Tax Service simplified tax table.
- Deposit & Savings Interest CalculatorCalculate pre-tax and after-tax interest and the maturity payout of fixed deposits and installment savings, plus the actual yield of installment savings.
- Currency ConverterConvert 12 currencies, including the dollar, yen and euro, into won, and see the actual cost under cash and wire-transfer rates and FX discounts.
Loan & Real Estate Calculators
- Loan Interest CalculatorCompare the monthly payment and total interest of three repayment methods side by side: equal principal and interest, equal principal, and bullet repayment.
- DSR CalculatorCalculate your DSR (debt service ratio) from existing loans and annual income, and estimate your additional mortgage limit under the stress DSR.
- Real Estate Brokerage Fee CalculatorCalculate the legal maximum brokerage fee from the transaction amount for sales, jeonse and monthly rent. Includes monthly-rent conversion and VAT.
Tax & Tax Saving
- Overseas Stock Capital Gains Tax Saving SimulatorUsing the KRW 2.5 million basic deduction and loss offsetting, simulate how much you can sell before year-end to reduce your tax.
- Comprehensive Financial Income Tax & Health Insurance CheckerCheck whether your interest and dividends exceed KRW 20 million and whether your status as a dependent on health insurance is affected.
- After-tax Return Comparison by AccountCompare the after-tax result of the same investment in a regular account, an ISA, a pension savings account and an IRP.
- Pension Savings & IRP Tax Credit CalculatorFrom your pension savings and IRP contributions, calculate your year-end tax settlement refund and the amount remaining up to the limit.
- ISA Tax Saving CalculatorCompare the after-tax amount of the same investment in an ISA and a regular account, reflecting the tax-free limit and the 9.9% separate taxation.
- Korea-listed vs US-listed ETF After-tax ComparisonCompare the tax on distributions and trading gains, and the after-tax amount, when you buy the same S&P 500 ETF listed in Korea versus listed in the US.
- High-dividend Company Separate Taxation CalculatorCompare which is more favorable: the separate taxation (14 to 30%) of dividend income from high-dividend companies in effect from 2026, or comprehensive taxation.
- Comprehensive Income Tax CalculatorCombine earned, business, pension and other income to estimate your tax base, tax bracket, and the extra tax due or refund in May.
- Real Estate Capital Gains Tax CalculatorCalculate capital gains tax when selling a home, reflecting the one-household-one-home exemption, the long-term holding special deduction, and short-term and heavy-tax rates.
- Child Stock Gift CalculatorPlan the timing and amount of a gift using the 10-year gift deduction limit, and calculate the gift tax.
Calendar
- IPO Subscription CalendarSubscription dates, book-building competition rates, final offering prices and listing dates in one place.
- Ex-dividend Date CalendarEx-dividend dates, record dates and payment dates for major Korean and US stocks.
- Lock-up Expiration CalendarCheck in advance how many shares could reach the market when mandatory holding periods end.
- CB/BW Conversion CalendarConvertible bond and warrant volumes that become eligible for conversion requests, and the dilution risk.
- Earnings & Economic Indicators CalendarFOMC, CPI, jobs data, Monetary Policy Board meetings and major company earnings releases.
Market Data
- Top Foreign & Institutional Net BuyingThe stocks that foreign investors and institutions bought and sold the most on KOSPI and KOSDAQ.
- 52-week Highs & Volume SurgesStocks that set a new 52-week high today and stocks whose volume jumped well above normal.
- Short Selling & Margin Loan TrendsThe flow of margin loan balances and short-selling trading value, for reading signs of an overheated market and forced liquidation.
- Theme Stock MapThe 20 themes the market is watching most right now, and their constituent stocks, as a treemap.
If there's a term you don't know.
From PER to overhang, investing terms explained simply.