Numbers first. Then the table.

All calculators

• Percentage calculatorFind a percent of a number. Fast, no account.
• Percentage change calculatorPercent increase or decrease between two numbers.
• Discount calculatorSale price after a percent off.
• Tip and split calculatorTip a bill and split it evenly.
• Unit converterLength, weight, temperature, and area.
• BMI calculatorBody mass index from height and weight (CDC categories).
• TDEE calculator (Mifflin-St Jeor)Basal metabolic rate and daily energy estimate.
• Diet / health calculatorCalories, macros, keto, and keto plus workout. Portions from body weight and goal.
• Water intake calculatorA simple 0.5 oz per pound rule of thumb.
• Sleep hours calculatorCount back from a wake time.
• Age calculatorYears and days since a birth date.
• Days between datesInclusive calendar span between two dates.
• Hours between timesDuration between two clock times.
• Pregnancy due date calculatorNaegele’s rule (LMP + 280 days). Estimate.
• GPA calculator (4.0 scale)Weighted by credits.
• Grade needed on a finalWhat you need on the final to hit a target.
• Hourly ↔ salary calculatorConvert using 2,080 hours per year (40 × 52).
• Auto loan calculatorMonthly payment and total interest on a car loan.
• True cost of a carLoan, insurance, fuel (your MPG, your $ / gal, your miles), maintenance. Optional NAIC 2023 state average for insurance.
• Loan payoff calculatorMonths to pay off a balance at a given payment.
• Credit card payoff calculatorMonths and interest at the minimum versus with extra. Default APR 19.9%. Same math as loan payoff.
• Life insurance needs calculatorIncome × years to replace, plus debts, minus existing coverage. Rule of thumb, not a quote.
• US + state paycheck calculatorEstimate take-home with 2026 federal, FICA, and Tax Foundation state brackets. Search a town to set the state.
• Sales tax calculatorState rate plus optional local (defaults to Tax Foundation 2026 average local).
• Property tax calculatorHome value × statewide effective rate, with a custom override. Local millage differs.
• Personal property / car tax calculatorEnter a rate. Virginia Fairfax/Loudoun/PW defaults included; other states are not faked.
• Mortgage calculatorPrincipal and interest, total interest on an amortizing loan.
• Square footage calculatorArea from length and width, times rooms.
• Paint calculatorGallons from area, coats, and editable coverage. Typical interior latex label ~350 sq ft/gallon, not a sourced index.
• Concrete calculatorBags from slab volume and an editable bag yield. Typical 80-lb label ~0.60 cu ft, not a sourced index.
• Flooring calculatorBoxes from area plus waste. Typical box label ~20 sq ft, not a sourced index.
• Cost of living calculatorCompare metros, counties, and Census places. BEA RPP for metros; housing-only ACS for counties and towns.
• Car insurance calculatorNAIC 2023 state average expenditure or combined average premium. Not a personal quote.
• Grocery cost calculatorUSDA Food Plans (July 2026) by household size; optional BEA goods RPP for a metro. No town grocery index.
• Basic adulting starter kitOne-time cash and monthly burn with sourced defaults for rent, food, and insurance. Optional storage line is yours to enter.
• City-to-city move costMiles you type, plus $ per mile, truck, gas, packing, and hotel. No city-pair distance and no mileage index.
• Retirement calculatorNest egg needed vs projected savings. Optional COL-adjusted spending.
• Trump Account calculatorOBBBA 2025 / IRC §70204 estimate: seed, $5,000 cap, growth until 18.
• College savings calculatorProjected savings versus College Board 2025–26 average published tuition, fees, and housing and food. Estimates only.
• Compound interest calculatorFuture value with optional monthly contributions.
• Compare two US placesSide-by-side metros, counties, or towns: equivalent salary, rent, home value, income.
• Rent vs buy calculatorMonthly rent versus the monthly cost of owning. Tax Foundation property tax; editable rate, insurance, and stay horizon.
• Contractor vs W-2 calculatorTake-home as a 1099 contractor versus W-2 at the same gross. SE tax, optional QBI, Tax Foundation 2026 state brackets.
• Extra withholding calculatorExtra dollars per paycheck × pay periods. Annual extra withheld — not a predicted IRS refund from AGI.
• Refinance break-even calculatorMonths to recoup closing costs from a lower payment. FRED/Freddie rate default. Not a quote.
• Can I afford this houseMonthly payment stack: P&I, tax escrow, HO insurance, PMI under 20% down, HOA, optional flood. Then 28/36 and take-home.
• Rent affordability calculatorRent as a percent of take-home versus the 30% rule of thumb. Optional 28/36 comparison. Estimate, not a sourced index.
• 401(k) Roth vs traditionalThis year’s take-home: traditional vs Roth employee deferral. IRS 2026 limits. Not tax advice.
• Social Security claiming ageYou provide a FRA monthly benefit. SSA percents for FRA 67 (born 1960+): 70% at 62, 100% at 67, 124% at 70. Estimates only.
• Inflation / salary worthWhat a dollar amount from a past year is worth now, using BLS CPI-U.