Korea

Works out how many paid leave days have accrued by joining date or fiscal year, including the first-year rule.

Checks the 10-digit check sum of a Korean business number and can bulk-validate a pasted column.

Estimates capital gains tax on a house, land or 분양권 from prices, dates and expenses — 장기보유특별공제 표1/표2, the 12억 1세대 1주택 rule, short-term rates and the 조정대상지역 surcharge you choose.

Estimates 종합소득세 from business, salary and other income with 인적공제, pension deduction, 자녀·표준세액공제 and 지방소득세, showing every step; expense ratios and itemised credits are entered, not looked up.

Draws the four pillars for a birth moment from the solar terms and the sexagenary cycle, counts the five elements and names the ten gods against the day stem, with the true-solar-time correction for the hour pillar.

Computes the 3.3% withholding on freelance income both ways — from gross and from the amount received.

Converts Hangul to Roman letters under the Revised Romanisation rules, with name and passport modes.

Scores the 84-point housing subscription total from dependants, no-home period and account age.

Converts a deposit into monthly rent and back at a given conversion rate, against the statutory cap.

Works out your 만나이, 연나이 and the old 세는나이 from a birth date, on any reference day.

Counts characters with and without spaces and in bytes, matching how application forms count them.

Lists public holidays and substitute holidays for a year, including the lunar-dated ones, as a calendar or ICS.

Flags spacing, spelling and particle mistakes in Korean text and explains the rule behind each one.

Builds a repayment schedule for equal-payment, equal-principal or interest-only loans, with early repayment.

Converts between lunar and solar dates, handling leap months, and lists a lunar birthday for years ahead.

Converts between hourly, monthly and annual pay at the statutory minimum, including the weekly holiday allowance.

Works out take-home pay from a gross salary after the four insurances, income tax and local tax.

Reads the text of a property register (등기사항전부증명서) into 표제부·갑구·을구, lists the ownership history and live mortgages with their total, and flags 가압류·가처분·압류·경매·임차권.

Converts between 평 and square metres and shows the common apartment sizes each value corresponds to.

Finds resident numbers in text or a spreadsheet column and masks them to the legally acceptable form.

Calculates statutory severance from the average wage of the last three months and the service period.

Splits national pension, health, long-term care and employment insurance between employee and employer.

Estimates the daily benefit and payment period from age, insured period and average wage.

Adds or removes the 10% VAT and splits a total into supply value and tax for invoice lines.

Computes the year’s 24 solar terms to the minute of 절입시각, with the 삼복 dates and which term today falls in.

Estimates acquisition tax on a home or other property — the 1–3% progression, 8%/12% multi-home surcharges by your region choice, 지방교육세, 농어촌특별세 and the first-home relief.

Writes a number as the formal Korean amount used on contracts — 일금 오백만원정 — and back again.

Repairs Hangul mangled by a CP949/UTF-8 mix-up by trying every plausible encoding path and previewing each.

Reads 배달의민족·쿠팡이츠·요기요 settlement CSVs by column name, totals the fees, and matches each payout against your bank statement by amount and date, listing what never arrived.

Opens NTS e-tax invoice XML files (or a zip of them) into a table of supplier, buyer, items and tax, and checks that the items, totals, VAT rate and business numbers agree.

Extracts initial consonants from Hangul and matches a list against a 초성 query — ㄱㅁㅇ finds 감마원.

Turns a KakaoTalk export (PC, Android, iPhone, Mac CSV) into per-person counts and shares, hourly and weekday charts, a day-by-hour heatmap, median reply times, emoji and frequent words.

Recovers text typed with the wrong input mode and converts between the 2-set and 3-set layouts.

Picks number sets with exclusions and fixed numbers, and checks a saved set against past results.

Identifies the courier from an invoice number’s format, validates its check digit and builds the tracking link.

Reads a pasted payslip (text or CSV) into allowance and deduction items, checks the totals add up, and recomputes the four insurances and local tax against the current tables.

Checks whether a 13-digit resident number is structurally valid — date part, region rules and check digit.

Calculates annual vehicle tax by engine displacement and vehicle age, with the prepayment discount.

Gives the Korean animal sign, the sexagenary year name and the star sign for a birth date.

Identifies the likely bank from an account number’s length and prefix and normalises the formatting.

Reads Hanja as Hangul with 두음법칙 applied at word starts, offering every reading of an ambiguous character, and lists the Hanja for each syllable of a Korean word — readings only, no meanings.