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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Lifestyle
US Parcel Shipping Comparison
Compare 2026 shipping rates: USPS Ground Advantage (7.8% increase Jan 18), UPS Ground (5.9% GRI Dec 22, 2025), FedEx Ground (5.9% GRI Jan 5). USPS wins under 5 lbs.
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Insurance
Unemployment Benefit Estimator
Free unemployment insurance benefit estimator. Calculate weekly benefit amount based on base period wages and your state's formula. Coverage typically 26 weeks; Massachusetts 30, Florida 12.
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Insurance
Reverse Mortgage HECM Calculator
Free HECM (Home Equity Conversion Mortgage) calculator. Estimate the Principal Limit and cash available based on home value, age, and current 10-year LIBOR/SOFR Expected Rate.
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Insurance
Traditional vs Roth IRA Calculator
Free Traditional vs Roth IRA calculator. Compare tax-deferred Traditional IRA growth (deduct now, pay tax in retirement) to Roth IRA (pay tax now, withdrawals tax-free).
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Insurance
401(k) vs IRA Contribution Calculator
Free 401(k) vs IRA optimizer. Find the right contribution mix between employer 401(k) match, Roth IRA, and 401(k) max — based on tax rate and employer match formula.
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Insurance
Paid Family Leave State Calculator
Free state Paid Family Leave (PFL/PFML) calculator. Estimate weekly benefit amount and benefit weeks for the 13 US states with paid family leave programs in 2026.
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Lifestyle
Points & Mileage Cash Value Converter
Convert credit card / airline / hotel points to dollar value. TPG May 2026: Chase UR 2.05¢, Amex MR 2.0¢, Marriott 0.7¢, Hilton 0.5¢, Delta SkyMiles 1.4¢, Southwest 1.5¢.
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Real Estate
Lease Notary & Recording Cost
Free lease notarization and recording cost calculator. Compute notary fees (state-capped), county recording fees for memoranda of lease, attorney review costs for residential, commercial, and ground leases.
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Finance
Currency Exchange Calculator
Free currency exchange calculator with bank fee markup. Convert USD to EUR, GBP, JPY, MXN, CAD, and other currencies — and see how much fees and credit card foreign transaction charges actually cost.
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Real Estate
BRRRR / Fix and Flip Equity Calculator
Free BRRRR and fix-and-flip calculator. Models the BiggerPockets BRRRR strategy and house-flipping ROI using the 70% rule, ARV (after-repair value), and cash-out refinance scenarios.
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Finance
Stock Return Calculator
Free stock return calculator. Compute gross profit, ROI percentage, and after-tax return on a stock trade. Models US long-term capital gains tax (0%, 15%, 20% by income bracket).
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Finance
Crypto Trading Return Calculator
Calculate cryptocurrency trading profit, return %, and tax. Federal LTCG 0/15/20% (long-term) or ordinary rates (short-term). 1099-DA reporting starts 2026.
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