Korea Payroll & Tax API › pregnancy-due-date

Pregnancy due date and gestational week from the last menstrual period, with the South Korean labor-law dates that follow

Pregnancy due date and gestational week from the last menstrual period, with the South Korean labor-law dates that follow: reduced working hours in pregnancy, earliest maternity leave start, and the paternity leave deadline.

Price: $0.01 USDC per call over REST (x402 on Base, no API key). MCP: free as pregnancy_due_date at https://api.kkuldogu.com/mcp. Basis year: 2026.

Input

Example request

curl -X POST https://api.kkuldogu.com/v1/pregnancy-due-date -H "content-type: application/json" \
  -d '{"lastPeriodDate":"2026-07-01","referenceDate":"2026-11-12"}'

Without payment this returns 402 with x402 payment requirements; an x402 client pays $0.01 USDC and retries.

Example response

{
  "basisYear": 2026,
  "currency": "KRW",
  "disclaimer": "For reference only, not legal or tax advice. Uses official 2026 Korean rates and the same formulas as the kkuldogu.com calculators; actual payroll, NHIS/NPS notices and tax settlement can differ.",
  "source": "https://kkuldogu.com",
  "tool": "pregnancy-due-date",
  "input": {
    "lastPeriodDate": "2026-07-01",
    "referenceDate": "2026-11-12"
  },
  "result": {
    "dueDate": "2027-04-07",
    "gestationalWeeks": 19,
    "gestationalDays": 1,
    "daysUntilDue": 146,
    "trimester": 2,
    "progressPct": 48,
    "reducedHoursFirstPeriod": {
      "from": "2026-07-01",
      "to": "2026-09-22"
    },
    "reducedHoursFromWeek32": "2027-02-10",
    "earliestMaternityLeaveStart": "2027-02-22",
    "maternityLeaveEndIfStartedEarliest": "2027-05-22",
    "paternityLeaveDeadline": "2027-08-04"
  }
}

For reference only, not legal or tax advice. Uses official 2026 Korean rates and the same formulas as the kkuldogu.com calculators; actual payroll, NHIS/NPS notices and tax settlement can differ. · Calculators for people (Korean): kkuldogu.com · API home · llms.txt · OpenAPI