Electric
Industrial Electric Calculator
Wire size, breaker capacity, voltage drop calculators based on KS standards
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Free online tools based on Korean standards
Workmate
Electric, tax, and document calculators precisely aligned to Korean Standards (KS), in one place.
Available Tools
Timber
Timber Construction Calculator
Rafter, roof pitch, stairs, and lumber quantity calculators for wood frame construction
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Payroll
4-Major Insurance
Korean payroll insurance (pension, health, employment, accident) calculator with 2026 rates
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Tax
Foreign Stock Capital Gains
Korean residents' foreign stock capital gains tax with FX, KRW 2.5M deduction, 22% rate
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Util
JSON ↔ CSV
Korean-encoding-aware (UTF-8 BOM) JSON ↔ CSV converter with Excel compatibility
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Business
Business Number Validation
Offline checksum validation of Korean business registration numbers (NTS standard algorithm)
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BusinessComing Soon
Business Registration Status
Real-time NTS Hometax lookup for business operating status (API integration pending)
SafetyComing Soon
MSDS Search
Search and compare Material Safety Data Sheets