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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Labor
Labor Standards Calculators
Annual leave, weekly rest pay, severance, minimum wage. Korean Labor Standards Act with cited law and step-by-step output.
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Payroll
4-Major Insurance
Korean payroll insurance (pension, health, employment, accident) calculator with 2026 rates
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Tax
Korean VAT Calculator
Split inclusive price into supply + VAT, plus general / simplified taxpayer filing
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Finance
Compound Interest
Principal × rate × period + periodic contribution → future value, EAR, CAGR, yearly balance
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Loan
Loan Calculator
Equal payment / equal principal / balloon — Korean mortgage & credit loan amortization
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Convert
Pyeong ↔ m²
Korean pyeong / square meters / ja² conversion + real-estate area presets (59㎡, 84㎡)
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Convert
Percent Calculator
Discount, markup, change rate, reverse — VAT, sale price, percent change in one place
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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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