Ilsang Calc (“ilsang” means everyday in Korean) is a small set of free calculators for the math people do every week: percentages, days between dates, loans, savings, trip fuel costs and word counts.
- Private by design. Every calculation runs in your browser. Nothing you type is sent to a server or stored.
- Shown working. Each calculator explains the formula it uses, so you can check it.
- Tested. Every calculator is checked against known answers before each update goes live.
Results are estimates. For loans and taxes, confirm the final numbers with your lender or a professional.