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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Auto
Car Depreciation Calculator
Free car depreciation calculator. Project resale value by year using industry-standard depreciation curves: average car loses 20% in year 1, 50–60% over 5 years.
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Health
Food Calorie Calculator
Free food calorie calculator with USDA FoodData Central values. Look up calories per serving for common foods, fast food, and restaurant items. Accurate for tracking and meal planning.
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Auto
Auto Loan Calculator
Free auto loan calculator. Compute monthly car payment and total interest by APR, term, and price. Federal Reserve average rates by credit tier and term length.
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Auto
Parking Cost Calculator
Free parking cost calculator. Compute hourly rate parking cost, compare to daily maximum, and find break-even with a monthly pass for commuting in NYC, SF, Chicago, LA.
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Taxes
Federal Income Tax Calculator
Calculate your 2026 federal income tax with all OBBBA changes: Rev. Proc. 2025-32 brackets, $16,100/$32,200 standard deduction, $2,200 CTC, $6,000 senior bonus, FICA, and net take-home.
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Taxes
Federal Estate Tax Calculator
Estimate federal and state estate tax with the new $15M OBBBA permanent exclusion, marital and charitable deductions, DSUE portability, and 12 state-level estate taxes.
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Taxes
Federal Gift Tax Calculator
Calculate federal gift tax on any size gift: $19,000 annual exclusion (2026), $15M lifetime exclusion, $194,000 non-citizen spouse exclusion, gift-splitting, and 529 superfunding.
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Taxes
Annual Tax Return Calculator
Estimate your 2026 federal tax refund or amount owed before filing Form 1040. Includes OBBBA brackets, $2,200 CTC, $6,000 senior bonus, and W-2 withholding comparison.
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Taxes
Self-Employment Tax Calculator
Calculate self-employment tax for 1099 contractors, freelancers, and gig workers. SE tax (15.3%), QBI 20% deduction, half SE deduction, and quarterly estimated payment.
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Taxes
Cryptocurrency Tax Calculator
Calculate US crypto tax for sales, swaps, staking, mining, airdrops, and NFTs. Short-term/long-term gains, NFT 28% collectible rate, NIIT, state tax, and Form 1099-DA prep.
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Work & Salary
US Minimum Wage Calculator
Calculate weekly, monthly, and annual pay at minimum wage. 2026 state rates: WA $17.13 (highest), CT $16.94, CA $16.90, DC $17.95. Federal $7.25 since 2009.
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Work & Salary
FICA & Medicare Tax Calculator
Calculate FICA payroll tax: 6.2% Social Security up to $184,500 wage base + 1.45% Medicare uncapped + 0.9% Additional Medicare over $200K. Employer match + FUTA included.
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