Choose whether gains show in red, as at Korean brokers, or in green, as overseas. Your choice is saved on this device.
From compound growth and retirement to mortgages and taxes. Find the calculation you need in seconds.
Amounts default to US dollars. You can change the currency on any calculator.
Compound growth, dollar-cost averaging, US taxes, retirement accounts and home loans.
See how a balance and monthly deposits grow, or solve for the deposit needed to hit a goal.
Monthly investing in the S&P 500, QQQ, SCHD or Bitcoin, simulated with real history.
Project dividends and assets with growth, taxes and reinvestment.
Convert total returns into annualized returns and back.
Find the nest egg and the age to reach financial independence with the 4% rule.
Turn your risk limit and stop price into a share count.
Monthly payment with taxes, insurance and PMI, plus an amortization schedule.
2026 federal tax, marginal and effective rate by filing status.
Net pay after federal tax, FICA and state tax.
Short- and long-term gains tax plus the 3.8% NIIT on stock sales.
Project your balance with 2026 limits, employer match and catch-up.
Find your retirement number and check if you are on track.
Compare the after-tax value of Roth and Traditional contributions.
How much house you can afford from income, debts and down payment.
Monthly payment, total interest and payoff time with extra payments.
Grow a deposit with APY, monthly contributions and compounding.
New average price after buying more, and shares needed for a target price.
The gain needed to recover from each percentage loss.
Shares to buy or sell to get back to your target weights.
Why 2x and 3x ETFs lose money in sideways markets.
Ownership and share-price dilution from new shares or convertibles.
Compare equal-payment, equal-principal and bullet repayment.
These tools apply Korean tax law, Korean accounts or Korean market rules. They are most useful if you invest, work or live in Korea, and many show amounts in won.
Korea: the 2.5M won deduction and loss netting before year-end.
Korea: the 20M won comprehensive-tax line and health premium impact.
Korea: separate taxation of high-dividend company payouts.
Korea: taxable income, bracket and tax owed.
Korea: gain, deductions and capital gains tax on a home sale.
Korea: gift deductions and gift tax on stocks given to children.
Korea: taxable, ISA, pension savings and IRP side by side.
Korea: ISA tax-free limit, separate taxation and after-tax result.
Korea: after-tax return of domestic vs US-listed ETFs.
Korea: year-end tax credit for pension savings and IRP deposits.
Korea: monthly net pay after the four social insurances and income tax.
Korea: severance pay, retirement income tax and IRP savings.
Korea: estimated National Pension benefit.
Korea: pre- and after-tax interest and maturity value.
Korea: debt service ratio and extra mortgage room with stress DSR.
Korea: legal brokerage fee cap by transaction amount.
Korea: price at which a margin purchase hits forced liquidation.
Korea: equal and proportional IPO allocation and deposit.
Korea: overseas-stock fees and FX discounts across brokers.
Korea: 12 currencies to won with cash and wire spreads.
Korea: split a won return on US stocks into price and currency effects.
Korea: combined exposure across several ETFs.
Korea: build a monthly after-tax dividend calendar.
2026 tax year
See your federal income tax, marginal rate and effective rate with the 2026 IRS brackets and standard deductions.