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)
-
Work & Salary
Overtime Pay Calculator
Calculate FLSA overtime pay: 1.5× over 40 hrs/week. Plus state daily overtime (CA/CO/NV/AK over 8/day) and California double-time (over 12/day). Exempt employee detection.
-
Taxes
Real Estate Gift Tax Calculator
Calculate gift tax on a real estate transfer: $19K annual + $15M lifetime exclusion, net-gift treatment for assumed mortgages, carryover basis to recipient, and Diedrich gain to donor.
-
Work & Salary
Freelance 1099 vs W-2 Calculator
Compare 1099 contractor vs W-2 employee true take-home: 15.3% SECA vs 7.65% FICA, employer benefits ($10K-$20K), QBI 20%, business expense deductions, health insurance.
-
Work & Salary
Shift Differential Pay Calculator
Calculate shift differential pay: evening +7.5%, night +12.5%, weekend +12.5%, holiday +75%, on-call $3.50/hr. NO federal mandate; entirely contractual/CBA-set.
-
Work & Salary
Bonus Tax Withholding Calculator
Calculate withholding on year-end bonuses, signing bonuses, commissions. IRS Pub 15-T 22% federal flat (37% over $1M), FICA, state. See if withholding matches your marginal rate.
-
Work & Salary
Workers Compensation Benefit Calculator
Calculate workers' compensation benefits: TTD/TPD/PPD/PTD at 66.67% of pre-injury wage, capped by state. CA $1,764 max, NY $1,281, IA $1,281. Tax-free under IRC §104(a)(1).
-
Work & Salary
Commuter Benefit Calculator
Calculate IRC §132(f) commuter benefit savings: $340/mo pre-tax for transit + $340/mo for parking (raised from $325 in 2025). Save 30-40% via federal + FICA + state tax exemption.
-
Health
BMI Calculator
Free BMI calculator for adults using CDC and NIH categories. Enter height and weight in metric or US units to find your Body Mass Index, weight class (underweight, healthy, overweight, obesity I–III), and a healthy reference weight.
-
Real Estate
First-Time Homebuyer Eligibility
Free first-time homebuyer eligibility checker. Compare FHA 3.5% down, Conventional 97 / HomeReady 3% down, USDA 0% down rural, VA 0% down. State down payment assistance programs.
-
Real Estate
Home Closing Cost Calculator
Free home closing cost calculator. Itemize loan origination, title insurance, escrow, recording, transfer tax (state-specific), FHA upfront MIP, VA funding fee, and prepaids.
-
Real Estate
Home Renovation Cost Calculator
Free home renovation cost calculator using Remodeling Magazine Cost vs. Value Report. Estimate kitchen, bathroom, addition, roof, and basement remodel costs by quality tier and US region.
-
Real Estate
Commercial Property Yield Calculator
Free commercial real estate cap rate, NOI, and DSCR calculator. Models office, retail, industrial, multifamily 5+, and mixed-use US commercial properties using CBRE / JLL Q1 2026 cap rate survey data.
Showing 133–144 of 178