Money & Math
Fuel Cost Calculator — Trip Split
Work out fuel cost from distance, mileage and fuel price, add tolls and split it per person. For trips within Korea you can look up the route distance and tolls.
Stock Average Down Calculator
Enter extra buys to get your new average cost, return at the current price and how many shares reach a target average. Fees and taxes are excluded.
YouTube Money Calculator (RPM & Shorts)
Estimate long-form and Shorts earnings per day, month and year from views and RPM or CPM, with US withholding at the South Korea treaty rate and a views goal.
Car Loan & Installment Calculator
Calculate the monthly payment, total interest and full schedule for a car installment plan from price, down payment, balloon, term and rate.
BMR & Daily Calorie (TDEE) Calculator
Calculate basal metabolic rate, total daily energy expenditure (TDEE) and calorie targets for losing or keeping weight from age, height and weight.
Percentage & Discount Calculator
Work out sale prices, discount rates, ratios, percent change and proportions as you type, or work back to the original price or cost, with the formula shown.
Unit Price Comparison
Compare up to 10 products by price per 100 g, 100 ml or per item, even when sizes and pack counts differ.
Korean Take-Home Pay Calculator
Enter annual or monthly pay to get Korean take-home pay after the 2026 four social insurances and income tax from Korea’s March 2026 withholding table, with dependents and children.
Korea High School Grade Calculator
Calculate South Korea high school class-rank grades from class size and rank on the 9-level and new 5-level scales, with tie handling.
Dividend Calculator (Korea Tax, DRIP)
Calculate dividends before and after South Korea tax (15.4%, or 15% US withholding on US stocks), with ISA, a reinvestment simulation and a goal-based reverse calculation.
Compound Interest Calculator
See how a deposit plus monthly savings grows year by year with monthly or yearly compounding, with the rule of 72 and optional South Korea 15.4% interest tax.
Korea Jeonse–Monthly Rent Converter
Convert between jeonse deposits and monthly rent at South Korea’s legal conversion cap (base rate + 2%) and check whether an offered rent exceeds it.
Korea Unemployment Benefit Calculator
Estimate South Korea job-seeking benefit for 2026 from your last three months of pay, age and insured period: daily amount (cap KRW 68,100), days and total.
Split the Bill
Enter each expense and who joined it, and see exactly who should send how much to whom, even when attendees change between rounds.
1RM Calculator — One Rep Max
Estimate your one-rep max from a weight and rep count with three formulas, and get a 50–100% training load table in kg or lb.
Seller Fee & Profit Margin Calculator
Subtract marketplace fees, shipping and cost from your price to see real profit and margin, or work back to the price you need.
Korean Appliance Power Bill (KEPCO)
Estimate monthly kWh per appliance and the bill under Korea’s KEPCO residential tariff, including tiers, summer bands, climate and fuel charges, VAT and the power fund.
GPA Calculator
Compute GPA and major GPA from credits and grades, convert between 4.5, 4.3, 4.0 and 100-point scales, and see the average you need for a target.
Korea Property & Holding Tax Calculator
Estimate South Korea’s 2026 property tax (July and September) and comprehensive real estate holding tax (December) from official assessed prices, with one-home rules and a co-ownership comparison.
Pyeong ↔ m² Converter (Korea)
Convert square meters and pyeong (1 pyeong = 3.3058 m²), the floor-area unit used in South Korea, and see what apartment sizes and room dimensions come to.
Korea Car Tax Calculator
Calculate South Korea annual car tax by engine size with age reductions, local education tax and the 2026 prepayment discount.
Volumetric Weight
Get volumetric weight from length, width and height, compare it with actual weight and see which one is billed, for one box or several.
Unit Converter
Convert length, weight, area, volume, speed and temperature instantly, including Korean units like pyeong and geun.
BMI Calculator — Asian Cutoffs
Get your BMI, obesity class and healthy weight range from height and weight, using the Korean Society for the Study of Obesity 2022 (Asian) cutoffs rather than WHO’s.
Currency Converter
Convert currencies at the European Central Bank reference rate, updated daily, and see the real amount once bank fees are added. The rate date is shown.
Scientific Calculator
A scientific calculator with trig in degrees or radians, logs, powers, roots and factorials, correct operator precedence, keyboard input and history.
Korean Real Estate Agent Fee
Enter a sale, jeonse or monthly-rent amount to see Korea’s capped broker fee and VAT next to the statutory rate table (2021 revision).
Roman Numeral Converter
Convert numbers 1–3,999 to Roman numerals and back with a place-by-place breakdown; non-standard forms like IIII get the correct spelling.
VAT Calculator
Split a total into supply value and VAT or add VAT to a net price, with multi-line totals and Korea’s simplified-taxpayer VAT.
Korea DSR, LTV & DTI Calculator
Estimate South Korea mortgage limits from income, rate and term: stress DSR, LTV and DTI under Korean lending rules checked on 2026-09-30.
Loan Payment Calculator
Enter amount, rate and term to compare monthly payments and total interest for amortizing, equal-principal and interest-only loans, with a grace period option.
Korea Acquisition Tax Calculator
Calculate South Korea home acquisition tax (1–3%, 8% and 12% surcharges), local education and rural special taxes, and the first-home reduction.
Korea Annual Leave Calculator
Count paid annual leave under South Korea Labor Standards Act Article 60 from your hire date or fiscal year, with resignation settlement and unused-leave pay.
Korea Home Capital Gains Tax Calculator
Estimate South Korea capital gains tax on a home sale with the KRW 1.2 billion one-home exemption, long-term holding deduction and progressive rates.
Korean 3.3% Withholding
Calculate Korea’s 3.3% freelance withholding both ways: from contract amount to take-home, or back from the amount you want to receive.
Korea Gift & Inheritance Tax Calculator
Estimate South Korea’s gift and inheritance tax under the law in force in 2026: 10-year aggregation, marriage and birth deductions, generation-skipping surcharges, spouse and lump-sum deduction limits and filing deadlines.
Savings Interest Calculator
Enter rate and term to see the maturity amount of a Korean deposit or installment savings after Korea’s 15.4% interest tax, with tax-free and credit-union options.
Korean Severance Pay Calculator
Enter your start date, last working day and last three months of pay to get Korean statutory severance pay, Korean retirement income tax and the net amount, using the labor ministry’s method.
Korea Weekly Holiday Pay Calculator
Enter hourly wage and weekly hours to calculate Korea’s weekly holiday allowance with weekly and monthly pay, based on the 2026 Korean minimum wage of KRW 10,320.
Korea Year-End Tax Calculator (2025)
Estimate your Korean year-end tax settlement refund or extra payment for tax year 2025 from salary, family, card spending, pension savings, medical costs and rent.
Korea Import Duty & VAT Calculator
Estimate South Korea customs duty and VAT on overseas purchases from price, shipping and the customs rate, with the USD 150 (USD 200 from the US) duty-free limit.
Fraction Calculator
Add, subtract, multiply and divide fractions and mixed numbers. See the simplified answer, the mixed number and the decimal, with every step from common denominators to simplifying.
Korea Parental Leave Pay Calculator
Calculate South Korea parental leave pay (up to KRW 2.5 million a month under the 2025 rules), the 6+6 both-parents scheme and maternity leave pay.
Korea Loan Prepayment Fee Calculator
Calculate the early repayment fee on a Korean loan with the remaining-days method, see when Korea’s 3-year rule waives it, and compare it with the interest you save.
Korea Housing Subscription Points
Calculate your South Korea apartment subscription points (out of 84) from homeless period, dependents and savings account age, including spouse-account bonus.
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