About Workmate

I work in electrical and construction sites, and I kept doing the same calculations over and over. Looking up wire sizes from KEC tables. Recreating Excel templates for Korean payroll insurance. Translating American span tables into metric to figure out whether a 2x6 joist could span 4 meters.

So I built this. A collection of calculators precisely aligned to Korean Standards (KS, KEC, building code) in one place. To be honest, similar tools exist on the internet. But most use US units, are clunky on mobile, are buried under ads, or only show the answer without explaining how they got there.

Every calculator on Workmate shows the calculation steps. Because you need to attach the rationale to approval documents. Because explaining the formula is faster than handwaving when teaching someone. Because you should be able to verify the result yourself.

Who is this for?

• Korean electrical contractors and exam takers — KEC tables built in
• Wood frame builders — span, material, stairs, foundation in one place
• HR/payroll administrators — Korean 4-major insurance, 2026 rates
• Foreign stock investors filing Korean capital gains tax
• Foreigners living in Korea — visas (F-2-7, D-8), National Pension lump-sum refunds, health insurance, jeonse/wolse, and year-end tax settlement, in English, with situation-by-situation checklists

It started as a tool for Korean tradespeople, but I realized foreigners settling here have nowhere good to find "Korean standards, in English." So I've been growing the visa, tax, housing, and pension tools English-first.

How is the foreigner information verified?

For high-stakes areas like visas, tax, pension, and leases I follow one rule: cite official sources only — the National Pension Service (NPS), National Tax Service (NTS), the health-insurance service (NHIS), HiKorea (immigration), the land ministry (MOLIT), and the relevant statutes. Where sources disagree or the figure is unpublished (e.g. the OASIS score), I don't assert a number — I send you to the agency. Items that vary by nationality or visa status are marked (verify) right in the text.

Rates and laws change. When something is confirmed — like the 2026 National Pension rise to 9.5% — I update it immediately, and each tool shows a last-reviewed date so you know its basis. Still, always confirm with the agency or a professional before an actual filing or contract — this site is for nailing the first 90% quickly.

One important caveat

Results are for reference only. The structural span calculator applies only some of NDS's seven adjustment factors. The insulation calculator ignores thermal bridging. A structural engineer, electrical safety manager, or tax accountant must review your work before construction or filing. Use this tool to nail down 90%; let the expert nail the remaining 10%.

How is your data handled?

All inputs are processed in your browser. Nothing is sent to a server. The JSON↔CSV converter works the same way. This means everything works offline, and you can use it inside corporate environments where external tools are restricted.

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