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100 calculator topics · 500 planning modes · 20 categories

The math behind everyday money and life.

Explore 100 detailed calculator topics, each with five planning modes. Adjust the assumptions, inspect the formula, and check official sources for tax rules in supported states.

Most used

Taxes

Income tax estimator

Federal, supported-state and employee payroll tax estimates for 2026 or 2025.

Pay & payroll

Take-home pay

Net pay per paycheck after taxes and pretax 401(k) contributions.

Savings & banking

Compound interest

Grow a balance with monthly deposits and your choice of compounding.

Retirement

Retirement savings

Projected nest egg and a 4% rule income in today’s dollars.

Home buying

Mortgage payment

Principal and interest plus property tax, insurance, HOA and PMI.

Unit conversions

Unit converter

Length, weight, temperature and volume, US customary and metric.

Browse by question

What might I owe?Taxes, 5 tools
Income tax estimatorBonus tax impactEstimated tax plannerView all 5
What could I take home?Pay & payroll, 5 tools
Take-home paySalary to hourlyOvertime pay plannerView all 5
Where does the money go?Budgeting, 5 tools
Household monthly budgetSpending allocation plannerEmergency-fund plannerView all 5
What will this debt cost?Debt & credit, 5 tools
Loan paymentCredit-card payoff plannerDebt payoff strategyView all 5
How can I reach my savings goal?Savings & banking, 5 tools
Compound interestSavings goal calculatorCD and fixed-rate savingsView all 5
How could investments grow?Investing, 5 tools
Investment growth scenariosMonthly investing plannerInvestment fee impactView all 5
How might retirement look?Retirement, 5 tools
Retirement savingsRetirement withdrawal plannerEmployer match plannerView all 5
What might a home cost?Home buying, 5 tools
Mortgage paymentHome affordability estimateDown-payment plannerView all 5
What does owning a home involve?Homeownership, 5 tools
Home maintenance reserveProperty cost estimateHome equity projectionView all 5
What will renting cost?Renting & moving, 5 tools
Rent affordability plannerRent increase projectionRent-versus-buy comparisonView all 5
What does getting around cost?Auto & commuting, 5 tools
Vehicle total-cost estimateFuel and trip costAuto-loan payment plannerView all 5
What do utilities add up to?Utilities & energy, 5 tools
Electricity bill estimatorHeating cost plannerWater-use cost estimateView all 5
How much coverage may I need?Insurance, 5 tools
Coverage gap estimateLife insurance needs estimateDeductible trade-offView all 5
What do these health numbers mean?Health & care costs, 5 tools
Adult BMIResting energy estimateHealth-care cost plannerView all 5
How do activity numbers compare?Fitness & activity, 5 tools
Running pace calculatorActivity time and distanceHeart-rate training zonesView all 5
What will this recipe or meal cost?Food & cooking, 5 tools
Recipe scaling calculatorMeal cost per servingGrocery unit-price comparisonView all 5
How do these measurements convert?Unit conversions, 5 tools
Unit converterArea and project coverageVolume and capacityView all 5
What might this trip cost?Travel, 5 tools
Trip budget plannerRoad-trip cost plannerTravel time estimatorView all 5
What might education cost over time?Education, 5 tools
Student-loan plannerTuition growth estimateCollege savings plannerView all 5
What do the business numbers show?Small business, 5 tools
Business break-even plannerPricing and profit marginSmall-business cash flowView all 5

Numbers you can check.

Read the methodology

Formulas in the open

Every page spells out the math step by step, so you can redo it on paper.

Sources, linked

Tax brackets, BMI ranges and unit factors come from the IRS, CDC, NIST and state agencies.

Every calculator