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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Real Estate
Lease vs Month-to-Month Calculator
Free lease vs month-to-month comparison calculator. Compare 12-month lease total cost to month-to-month rent including premium, plus break-even analysis for moving flexibility.
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Taxes
Real Estate Capital Gains Tax Calculator
Estimate your capital gains tax on a home sale: $250K/$500K Section 121 exclusion, federal LTCG (0/15/20%), 3.8% NIIT, and state tax — with full cost basis tracking.
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Real Estate
US Mortgage Calculator
Free US mortgage calculator. Compute principal & interest, property tax, homeowners insurance, PMI, and HOA into a full PITI monthly payment using current Freddie Mac PMMS rates.
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Work & Salary
Salary Raise Calculator
Calculate the REAL take-home increase from a salary raise after federal taxes, FICA, and state taxes. See how much of your raise actually hits your bank account.
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Real Estate
Rental Property Yield Calculator
Free rental property yield calculator. Compute gross yield, net yield, cap rate, and cash-on-cash return for US single-family or multi-family rental properties.
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Work & Salary
PTO Payout Calculator
Calculate unused PTO payout at separation. 8 states require mandatory payout (CA/CO/IL/LA/MA/MT/NE/ND); 4 states ban use-it-or-lose-it (CA/CO/MT/NE). After-tax estimate.
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Work & Salary
Paid Sick Leave Calculator
Calculate paid sick leave accrual under state laws. 22 states + DC mandate paid sick leave with 1-hour-per-30-worked accrual. CA 40 hrs (raised 2024), MI 72 hrs ESTA 2025.
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Developer Tools
Hash Generator
Free online hash generator for MD5, SHA-1, SHA-256, SHA-512, SHA3-256, and SHA3-512. Hex or Base64 output. Produces all six hashes instantly side by side.
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Education
FAFSA Pell Grant Calculator
Free FAFSA Pell Grant calculator. Estimate your federal Pell Grant award based on Student Aid Index (SAI), family size, and income — using the latest Federal Student Aid (ED) formula.
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Work & Salary
Hourly to Salary Calculator
Convert hourly wage to weekly, biweekly, monthly, and annual salary. Includes FLSA overtime (1.5×) over 40 hrs and 2,080-hour standard FTE comparison.
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Taxes
Property Tax Calculator by State
Estimate annual property tax for any US state using ATTOM-verified effective rates, state-specific homestead exemptions, senior reductions, and special rules like CA Prop 13 and TX SB2.
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Work & Salary
Hourly Wage Value Calculator
Calculate your true hourly value: salary ÷ 2,080 standard, real hourly with unpaid lunch deducted, total comp including benefits. BLS Q3 2025 benchmarks.
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