Financial, Payroll & Investment
Compound growth, loan costs, tips and taxes, salary conversions, overtime, and retirement projections — the everyday money math, done properly.
Compound Interest Calculator
Future value with monthly contributions, plus a year-by-year growth schedule.
Calculate → LOANLoan Calculator
Monthly payment, total interest and the full amortization schedule for any fixed-rate loan.
Calculate → MORTGAGEMortgage Calculator
Monthly P&I with taxes and insurance — compare 15, 20 and 30-year terms.
Estimate → CAR LOANCar Loan Calculator
Auto payment with down payment and trade-in credited — see the real total cost.
Estimate → TIP & SPLITTip Calculator
Tip, total and per-person split for any bill, with 15/18/20% presets.
Calculate → SALES TAXSales Tax Calculator
Add sales tax to a price — or reverse it back out of a tax-included total.
Calculate → DISCOUNT & MARKUPDiscount & Markup Calculator
Percentage off and savings for shoppers; markup and true margin for sellers.
Calculate → SALARYHourly to Salary Calculator
Hourly ↔ salary in both directions, with monthly, biweekly and weekly figures.
Convert → TAKE-HOMEPaycheck Calculator
Gross pay with overtime, then an estimated take-home after FICA and federal withholding.
Estimate → OVERTIMEOvertime Pay Calculator
Time-and-a-half and double time tiers on one screen, with California notes.
Calculate → RETIREMENTRetirement Calculator
Nest egg projection with employer 401k match — growth separated from contributions.
Project →Home, Sizing & Gear
Buy the right amount of carpet, tile, concrete and epoxy — then size the skis, bike, and helmet that fit you.
Carpet Calculator
Square feet and square yards with waste allowance and cost estimate.
Calculate → FLOORINGFlooring Calculator
Exact box count for laminate, vinyl or hardwood, waste included.
Calculate → TILETile Calculator
Whole-tile count for any room and tile size, cuts and breaks covered.
Calculate → CONCRETEConcrete Calculator
Cubic yards for the truck, 80-lb bag count for the wheelbarrow.
Calculate → EPOXYEpoxy Resin Calculator
Gallons for river tables and counters, wood displacement subtracted.
Calculate → POOLPool Volume Calculator
Exact gallons for rectangular and round pools — dose chemicals right.
Calculate → WILL IT FITFurniture Size Calculator
Room fit AND doorway passage checked before you click buy.
Check → SKISki Size Calculator
Ideal ski length from height, weight and honest skill level.
Find size → BIKEBike Size Calculator
Road frame in cm and mountain frame in inches from your inseam.
Find size → HELMETHelmet Size Calculator
Head circumference to S–XXL for bike, motorcycle and snow helmets.
Find size →Auto Calculators
Real-world MPG and trip fuel costs, tire fitment with speedometer checks, and the depreciation curve before you buy.
Gas Mileage Calculator
Real-world MPG from one tank — plus trip fuel cost at local gas prices.
Calculate → TIRE SIZETire Size Calculator
Decode 225/65R17-style specs: diameter, revs per mile, speedometer error.
Calculate → DEPRECIATIONVehicle Depreciation Calculator
Year-by-year value under declining-balance and straight-line methods.
Calculate →How It Works — Three Easy Steps
No manual, no install, no account. Pick a calculator, enter your numbers, read the answer.
- Pick your calculator. Finance, home projects, gear sizing, or cars — each tool does one job well and shows its formula assumptions.
- Enter your numbers. Sensible defaults are pre-filled, and every field explains exactly what it wants.
- Read the result. Answers appear instantly, with tables and breakdowns where they matter — all computed on your own device.
Frequently Asked Questions
Are these calculators free to use?
Yes. All 24 calculators are completely free with no trial, no account, and no limits. They run directly in your browser.
Do the financial calculators give financial advice?
No. Every calculator produces planning estimates only. They are not financial, tax, or legal advice — confirm important decisions with a qualified professional.
Is my data uploaded when I use a calculator?
No. Every calculation runs locally in your browser. The numbers you enter never leave your device.
How Accurate Are the Results?
- Formulas are standard. Amortization, compound interest, and geometry follow the same formulas banks, lenders, and contractors use — verified against reference values.
- Inputs drive outputs. Tax rates, APRs, and material prices vary by location and time; enter your real numbers for real answers.
- Estimates, not advice. For loans you're signing or taxes you're filing, confirm with a qualified professional.
Pick a Calculator, Get an Answer
Every tool above answers in under a second — right on this device, with nothing uploaded.
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