Editorial principles
- Every formula and figure is verified against official sources (laws and public agency notices).
- When rates change, the calculator and its guide content are updated together.
- Reported errors are fixed as soon as they are confirmed.
Calculators by Sin Dongho (178)
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Insurance
401(k) RMD Calculator
Free Required Minimum Distribution calculator. Compute mandatory annual withdrawal from 401(k), Traditional IRA, 403(b) using IRS Uniform Lifetime Table after age 73 (SECURE 2.0).
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Insurance
FUTA / SUTA Employer Tax Calculator
Free FUTA / SUTA employer unemployment tax calculator. Project federal FUTA (0.6% net on first $7,000) and state SUTA wage bases by state and experience rating.
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Insurance
FMLA Pregnancy Leave Calculator
Free FMLA pregnancy leave calculator. Project your 12-week federal Family and Medical Leave Act entitlement, plus state PFL pay if your state offers it.
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Insurance
COBRA Continuation Coverage Calculator
Free COBRA continuation coverage calculator. Estimate full premium (employee + employer share + 2% admin fee) for 18-36 months after qualifying event under federal COBRA.
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Insurance
Long-Term Care Insurance Calculator
Free long-term care insurance calculator. Estimate annual premium and coverage benefit by age, gender, and benefit period. Compare to self-funding $100K-$300K annual care cost.
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Insurance
State Disability Insurance (SDI) Calculator
Free State Disability Insurance (SDI) calculator. Estimate weekly benefit for short-term disability in California, New York, New Jersey, Rhode Island, Hawaii, and Massachusetts PFML medical.
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Insurance
Critical Illness Insurance Calculator
Free critical illness insurance calculator. Estimate annual premium for cancer, heart attack, stroke coverage. Lump-sum payout to cover deductibles, lost income, and out-of-pocket medical.
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Insurance
Life Insurance Coverage Calculator
Free life insurance needs calculator using DIME method. Compute appropriate coverage based on debt, income replacement, mortgage, and education needs for surviving family.
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Work & Salary
Paycheck Take-Home Calculator
Calculate net take-home pay from your annual salary using IRS Pub 15-T 2026, FICA (SS $184,500 + Medicare), 401(k)/health pre-tax, OBBBA brackets, and Child Tax Credit.
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Taxes
US Sales Tax Calculator
Compute the exact sales tax for any US transaction using state + local rates. Add tax to a net price or extract tax from a tax-inclusive total.
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Work & Salary
US Severance Package Calculator
Estimate severance pay using US industry standards: 1-2 weeks/year (staff), 2-3 (manager), executive 6-18 months. WARN Act 60-day penalty + NJ mandatory week-per-year.
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Health
BMR Calculator
Free BMR calculator using the Mifflin-St Jeor equation — the formula recommended by the Academy of Nutrition and Dietetics. Get your basal metabolic rate plus TDEE across five activity levels.
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