Examples with real numbers
Scenarios from investing, loans, property, business, everyday math, dates, and unit conversion—with concrete numbers. Read the situation, then open the linked calculator and try the same inputs.
14 examples
Example list
- Investing
Dividend calculator
Invest KRW 30,000,000 in an ETF with 4% annual yield, add KRW 200,000 each month, and hold for 4 years. Compare with dividend reinvestment on and off.
What to checkSee how expected assets after 4 years and average monthly pre-tax distributions differ with reinvestment on vs off.
Open this calculator - Loans
Loan repayment calculator
Borrow KRW 300,000,000 at 4.2% per year for 30 years (360 months) and try equal payment vs equal principal repayment.
What to checkCompare monthly payments and total interest over the full term between the two styles.
Open this calculator - Property
Jeonse vs monthly rent compare
Contract A: KRW 200,000,000 deposit, KRW 0 rent. Contract B: KRW 30,000,000 deposit, KRW 700,000 rent. Deposit opportunity cost 3% per year.
What to checkCompare monthly equivalent cost to see which contract is lower.
Open this calculator - Business
Marketplace selling price calculator
Product cost KRW 18,000, seller shipping/packing KRW 3,000, marketplace + payment fees 10%, target net margin 20%.
What to checkFind the minimum selling price for your margin and the recommended price rounded to KRW 1,000.
Open this calculator - Everyday
Percentage calculator
An item priced at KRW 80,000 with a 25% discount.
What to checkSee the price you actually pay after the discount.
Open this calculator - Date & time
Date difference calculator
Trip from 1 Sep 2026 through 8 Sep 2026.
What to checkSee nights-style elapsed days and inclusive day count together.
Open this calculator - Units
km ↔ mile converter
A running app logged 10 km and you want international miles.
What to checkSee how many miles 10 km is, and the reverse (mile → km).
Open this calculator - Investing
Compound interest calculator
Start with KRW 5,000,000, add KRW 200,000 at each month-end, 6% annual return for 10 years (120 months).
What to checkSee how much the final balance exceeds total contributions after 10 years.
Open this calculator - Loans
Loan refinance calculator
Remaining balance KRW 200,000,000, current 5% with 10 years left; new loan 3.5% for 10 years; switch costs KRW 1,500,000.
What to checkSee monthly payment savings and months to recover switching costs.
Open this calculator - Property
Rental yield calculator
Purchase KRW 300,000,000, acquisition costs KRW 10,000,000, rent KRW 1,000,000/month, operating cost KRW 2,000,000/year.
What to checkSee simple rental yield on total acquisition cost.
Open this calculator - Business
Break-even sales calculator
Fixed cost KRW 2,000,000/month, price KRW 30,000/unit, variable cost KRW 18,000/unit.
What to checkSee how many units you need to sell per month to cover fixed costs.
Open this calculator - Everyday
Unit price compare
Product A: 1,000 g for KRW 12,000. Product B: 750 g for KRW 9,500.
What to checkCompare unit price per same weight to see which is cheaper.
Open this calculator - Date & time
Korean full age (만 나이) calculator
Person born 1 Jan 1990 — full age as of today.
What to checkSee full age on the reference date and days until the next birthday.
Open this calculator - Units
Pyeong ↔ square meters
Apartment listed at 84 m² — how many pyeong?
What to checkUsing 1 pyeong = 400/121 m², see pyeong for 84 m².
Open this calculator