Calculators for every decision. Money, health, home, time and math: precise answers with the working shown. Free, private and instant.
Most used
Mortgage & Real Estate Mortgage Calculator Monthly payment with taxes, insurance, PMI, HOA and extra payments. Open Mortgage & Real Estate Home Affordability Calculator The most house your income supports, with the payment and the ratio that limits you. Open Mortgage & Real Estate Amortization Calculator Month-by-month loan schedule with payoff date and savings from extra payments. Open Loans & Debt Loan Calculator Monthly payment or affordable loan amount, with a full amortization schedule. Open Cars Auto Loan Calculator Car payment with sales tax, fees, rebates and trade-in, compared by loan term. Open Cars Car Lease Calculator Lease payment split into depreciation, rent charge and tax, plus a lease vs. buy check. Open Savings & Retirement Compound Interest Calculator Grow savings with regular deposits, any compounding frequency and inflation. Open Savings & Retirement Retirement Calculator Projected savings vs. what you need, with Social Security and inflation. Open
Mortgage & Real Estate
Payments, affordability, refinancing, home equity and closing costs. Run the numbers on the biggest purchase of your life.
All 14- Mortgage Calculator Monthly payment with taxes, insurance, PMI, HOA and extra payments.
- Home Affordability Calculator The most house your income supports, with the payment and the ratio that limits you.
- Amortization Calculator Month-by-month loan schedule with payoff date and savings from extra payments.
- Refinance Calculator Monthly savings, break-even month and lifetime cost of refinancing your mortgage.
- Rent vs. Buy Calculator Is it cheaper to rent or buy? Net cost of each over time and the break-even year.
- Closing Cost Calculator Itemized buyer closing costs and cash to close for conventional, FHA and VA loans.
- Debt-to-Income Ratio Calculator Front-end and back-end DTI, checked against conventional, FHA and VA limits.
- HELOC Calculator Credit limit, interest-only and repayment payments, and the payment jump after the draw.
- Home Equity Loan Calculator Fixed payment, total interest and how much equity you can borrow against.
Loans & Debt
Auto, personal and student loans, credit cards and payoff plans. See the true cost of borrowing and the fastest way out.
All 7- Loan Calculator Monthly payment or affordable loan amount, with a full amortization schedule.
- Personal Loan Calculator Payment, cash received after the origination fee, and the true APR.
- Credit Card Payoff Calculator Months to debt-free and total interest, compared with minimum payments.
- Debt Payoff Calculator Avalanche vs snowball for up to 5 debts, with your debt-free date and interest saved.
- Student Loan Calculator Payment, interest and payoff date, plus what extra payments save.
- APR Calculator Turn a rate plus points and fees into an APR, and compare two loan offers.
- Debt Consolidation Calculator Compare your debts with a consolidation loan, including fees and break-even.
Cars
Car payments, leases, refinancing, affordability and fuel costs, plus boat and RV loans. Know the full cost before you sign.
All 7- Auto Loan Calculator Car payment with sales tax, fees, rebates and trade-in, compared by loan term.
- Car Lease Calculator Lease payment split into depreciation, rent charge and tax, plus a lease vs. buy check.
- Car Affordability Calculator How much car your income or monthly budget buys, with tax, fees and running costs.
- Auto Refinance Calculator New car payment, interest saved and break-even month for refinancing an auto loan.
- Gas Cost Calculator Fuel cost of a trip, per person and per mile, with an electric car comparison.
- Boat Loan Calculator Monthly boat payment with sales tax and fees, total interest and a payment schedule.
- RV Loan Calculator RV payment with tax and fees, total interest, a schedule and the all-in monthly cost.
Savings & Retirement
Compound growth, retirement, 401(k), IRAs, CDs and inflation. Plan how today’s dollars become tomorrow’s.
All 17- Compound Interest Calculator Grow savings with regular deposits, any compounding frequency and inflation.
- Investment Calculator Ending balance, required contribution or required return, with a year-by-year table.
- Retirement Calculator Projected savings vs. what you need, with Social Security and inflation.
- 401(k) Calculator Your 401(k) at retirement with employer match and 2026 IRS limits.
- Roth IRA Calculator Tax-free Roth IRA growth vs. a taxable account and a traditional IRA.
- Savings Calculator Grow your savings with monthly deposits, or find the monthly amount to hit a goal.
- CD Calculator CD interest and maturity value, term comparison and early withdrawal penalty.
- Inflation Calculator What money from any year since 1913 is worth today, using official CPI data.
- RMD Calculator Your IRA or 401(k) required minimum distribution, deadline and future RMDs.
Tax & Income
Take-home pay, income tax, salary conversions and sales tax, built on current federal rules.
All 11- Paycheck Calculator Take-home pay per paycheck after federal, FICA and state taxes, in every state.
- Income Tax Calculator Your 2026 federal income tax, tax rates, credits and refund, bracket by bracket.
- Hourly to Salary Calculator Convert hourly, weekly, monthly and annual pay, with an optional take-home estimate.
- Sales Tax Calculator Add tax to a price or remove it from a total, with 2026 rates for every state.
- Tax Refund Calculator Estimate your 2026 refund or balance due, with child tax credit and EITC.
- Self-Employment Tax Calculator SE tax, income tax and quarterly payments on 1099 and freelance income.
- W-4 Calculator Exact Form W-4 entries for Steps 2–4, for a $0 balance or the refund you want.
- Capital Gains Tax Calculator Federal and state tax on a stock, crypto or home sale, with 2026 rates.
- Bonus Tax Calculator Take-home pay on a bonus after 22% federal, FICA and state withholding.
Business
Margins, markups, business loans, payroll taxes and freelance rates, for owners, sellers and the self-employed.
All 8- Margin Calculator Gross, operating and net profit margin, markup and the price for any target margin.
- Markup Calculator Retail price from cost and markup, with .99 price endings and the matching margin.
- Business Loan Calculator Term loan payments and APR, plus the real APR of a factor-rate cash advance.
- Payroll Tax Calculator Employer FICA, FUTA and SUTA on a paycheck, with 2026 wage caps and every state's rates.
- Freelance Hourly Rate Calculator Minimum freelance hourly and day rate after taxes, benefits, expenses and time off.
- SBA Loan Calculator SBA 7(a), Express, 504 and microloan payments, fees and effective APR.
- Break-Even Calculator Break-even units and revenue, contribution margin, and sales for a target profit.
- ROI Calculator ROI, annualized ROI and CAGR, with a side-by-side comparison of two investments.
Health & Fitness
BMI, calories, TDEE, macros and pregnancy due dates, using the formulas clinicians and researchers rely on.
All 12- BMI Calculator Body mass index with your healthy weight range, in US or metric units.
- Calorie Calculator Daily calories to lose, maintain or gain weight, with a table for every goal.
- TDEE Calculator Calories you burn per day, at every activity level, using three BMR formulas.
- BMR Calculator Basal metabolic rate by three formulas, compared side by side with the working.
- Macro Calculator Daily grams of protein, carbs and fat for your calorie target and diet style.
- Calorie Deficit Calculator The daily deficit and calorie target to reach a goal weight by a set date.
- Pregnancy Due Date Calculator Your estimated due date, weeks pregnant and pregnancy milestones by date.
- Ovulation Calculator Your fertile window, ovulation date and next period, for the next 6 cycles.
- Pace Calculator Running pace, finish time or distance, with splits and race-time predictions.
- Percentage Calculator Percent of a number, percent change, increase or decrease, with the working shown.
- Fraction Calculator Add, subtract, multiply or divide fractions and mixed numbers, with full steps.
- Standard Deviation Calculator Sample or population SD, variance, standard error and margin of error, step by step.
- Average Calculator Mean, median, mode, range and geometric mean of any list, with the steps shown.
- Percentage Change Calculator Percent increase or decrease between two values, reversed changes and percentage points.
- Z-Score Calculator Z-score from a raw score, p-values for any z, and the z-score for a percentile.
- Age Calculator Exact age in years, months and days, with your next birthday and birth weekday.
- Date Calculator Days between dates, business days, or a date plus or minus any number of days.
- Hours & Time Card Calculator Weekly timesheet with breaks, overnight shifts, overtime and gross pay.
- Time Calculator Add or subtract hours and minutes, shift a clock time, or find the time between two times.
Home & Garden
Concrete, square footage, paint, mulch and more. Estimate materials and costs before you buy.
All 14- Concrete Calculator Cubic yards and 40/60/80 lb bags for slabs, footings, columns and steps.
- Square Footage Calculator Square feet for up to 4 areas of any shape, with waste and cost per square foot.
- Mulch Calculator Cubic yards and 2 or 3 cu ft bags of mulch for up to 3 beds, with bag vs bulk cost.
- Gravel Calculator Tons, cubic yards and bags of gravel, stone, sand or topsoil for any area and depth.
- Paint Calculator Gallons and quarts of paint and primer for a room, walls and ceiling, with cost.
- Roofing Calculator Roof squares, shingle bundles, underlayment and ridge cap from footprint and pitch.
- Roof Pitch Calculator Rise and run to pitch, degrees and slope %, plus rafter length and a pitch table.
- Cubic Yard Calculator Cubic yards, cubic feet and m³ for boxes, holes and wedges, in any units.
- BTU Calculator AC and heater size for a room in BTU/hr and tons, from the ENERGY STAR chart.
Everyday & School
Grades, GPA, discounts, trip costs and the small calculations that come up every day.
All 6- GPA Calculator Semester and cumulative GPA on the 4.0 scale, weighted for honors and AP/IB.
- Grade Calculator Weighted course grade, or the final exam score you need for the grade you want.
- Discount Calculator Sale price and savings for % or $ off, stacked discounts, sales tax and original price.
- Dog Age Calculator Dog years to human years by size, plus the 2020 epigenetic formula.
- Budget Calculator Plan your monthly spending and check it against the 50/30/20 rule.
- Cost of Living Calculator The salary you'd need in another state, after prices and state taxes.
How we build
- Shown working.Every result explains the formula and walks through the numbers, so you can check it.
- Tested.Each calculation engine is tested against published reference values and official worked examples.
- Private.Everything runs in your browser. What you type is never sent to us.
- Shareable.Every result has a link you can bookmark or send, and tables export to CSV.