Everyday calculators
Free calculators for everyday numbers: a loan payment, your take-home pay, the paint for a room, a due date, a dog’s daily food.
Loans and savings
- Mortgage calculatorMonthly payment with taxes, insurance and PMI
- Loan calculatorPayment, interest and the effect of an extra payment
- Car loan calculatorMonthly payment with sales tax, fees and a trade-in
- Compound interest calculatorGrowth of savings with monthly deposits
- Inflation calculatorWhat money from any year since 1950 is worth now
- Retirement calculatorHow long your savings last in retirement
- 401(k) calculatorBalance at retirement with a match and the 2026 limits
- Savings goal calculatorThe deposit or the time to reach a savings goal
- Credit card payoff calculatorMonths and interest to pay off a credit card
- Simple interest calculatorInterest, rate, time or principal from the other three
- Amortization calculatorThe payment and the schedule of a loan, to the cent
- Mortgage payoff calculatorWhen a mortgage ends, and what extra payments save
- Refinance calculatorNew payment, break-even and total cost of a refinance
- APR calculatorThe APR of a loan with fees, as Regulation Z defines it
- Roth IRA calculatorThe 2026 Roth IRA limit for your income, and its growth
Taxes
- Income tax calculatorFederal income tax for 2026, bracket by bracket
- Tax bracket calculatorYour 2026 bracket and the tables for every status
- Tax refund calculatorEstimate your refund or what you owe for 2026
- Self-employment tax calculatorThe 15.3 percent tax on your profit, step by step
- Capital gains tax calculatorTax on long-term and short-term gains for 2026
- Sales tax calculatorAdd tax to a price or take it out of a total
Pay and work
Everyday math
- Percentage calculatorPercent of, percent change and the whole behind a part
- Tip calculatorThe tip, the total and each person’s share
- Age calculatorExact age in years, months and days, on any date
- Days between dates calculatorDays from one date to another, in weeks and months
- Business days calculatorWorking days between dates, or the date after some
- Time calculatorAdd or subtract time, and the hours between two times
- Date calculatorAdd or subtract days, weeks, months and years from a date
- Fraction calculatorAdd, subtract, multiply and divide fractions, step by step
- Average calculatorThe mean, median, mode and range of a list of numbers
- GPA calculatorA semester or cumulative GPA from grades and credits
- Ratio calculatorSimplify a ratio, solve a proportion, share an amount
- Week number calculatorThe week number of today or of any date
Shopping and business
Health and family
- Sleep calculatorBedtimes and wake-up times in whole sleep cycles
- Due date calculatorYour estimated due date from your last period
- How much sleep do kids need?The recommended hours by age, and a quick check
- BMI calculatorBody mass index and the healthy weight range, for adults
- Calorie calculatorCalories at rest and to keep your weight, with the working
- Protein calculatorDaily protein from your weight: allowance, training range
- Pace calculatorRunning pace per mile and kilometer, and finish times
- One rep max calculatorEstimate your one rep max from a set of 2 to 15
Home and garden
- Concrete calculatorSlabs, footings and columns, in yards and bags
- Mulch calculatorBeds of any shape, by the yard or the bag
- Gravel, sand and soil calculatorLoose material by the yard, the bag or the ton
- Paint calculatorGallons for walls and ceiling, with doors and windows off
- Tile calculatorTiles and boxes, with extra for cuts
- Square footage calculatorArea of rooms and other shapes in square feet, yards and meters
- Cubic yard calculatorCubic yards from a size, or from cubic feet and meters
- Board foot calculatorBoard feet of lumber, with hardwood quarters and cost
- Pool volume calculatorGallons in a pool, and the time to fill it
- Drywall calculatorSheets of drywall for the walls and ceiling of a room
- Roofing calculatorRoof area, squares and shingle bundles from the pitch
- Fence calculatorPosts, rails and pickets or panels for a fence
- Paver calculatorPavers for a patio, with the base and sand under them
- Flooring calculatorSquare feet and boxes of flooring for up to three rooms
- Electricity cost calculatorWhat up to four devices cost to run, from watts and hours
Car and travel
Pets
Where to start
Buying a home or a car
Start with the mortgage calculator, which adds taxes, insurance and mortgage insurance to the monthly payment. If you already have a mortgage, the mortgage payoff calculator shows when it ends and what an extra payment saves, and the refinance calculator compares your loan with a new one. For a car, the car loan calculator works from the price, your down payment, a trade-in, sales tax and fees.
Starting or changing a job
To see what you take home, use the paycheck calculator. It takes out federal income tax, Social Security and Medicare. The hourly to salary calculator turns an hourly rate into a yearly salary and the other way round. Extra hours go into the overtime calculator, and a bonus goes into the bonus tax calculator, which shows what is left after withholding.
Filing your taxes
The income tax calculator works out federal income tax for 2026 bracket by bracket, and the tax bracket calculator finds your bracket. To estimate a refund or what you owe, use the tax refund calculator. If you work for yourself, the self-employment tax calculator covers the tax on your profit. The capital gains tax calculator is for a gain on something you sold, and the sales tax calculator adds tax to a price or takes it out of a total.
Saving and retirement
The compound interest calculator shows how savings grow with monthly deposits, and the savings goal calculator finds the deposit that reaches a goal in a set time. For later in life, the retirement calculator shows how long your savings last, the 401(k) calculator adds an employer match, and the Roth IRA calculator gives the limit for your income. The inflation calculator says what money from any year since 1950 is worth today. The credit card payoff calculator counts the months and the interest it takes to clear a balance.
Fixing up the house and the yard
The paint calculator gives gallons, the tile calculator gives tiles and boxes, and the concrete calculator covers a slab, a footing or a column. Each of these tells you how much to buy, and so do the pages for mulch, gravel, sand and soil, drywall, roofing, flooring, fences and pavers. To measure the space first, use the square footage calculator. The pool volume calculator gives the gallons in a pool.
Health and family
The sleep calculator suggests bedtimes and wake-up times in whole sleep cycles, and the page on how much sleep kids need lists the recommended hours by age. The due date calculator estimates the date from your last period. For your own health and training, there are the BMI calculator, the calorie calculator, the protein calculator, a pace calculator for runners and a one rep max calculator.
Everyday questions
The percentage calculator answers four questions: a percent of a number, one number as a percent of another, the whole behind a part, and a change in percent. The tip calculator splits a bill, and the discount calculator gives the sale price. For dates, try the age calculator, the days between dates calculator, the business days calculator or the date calculator. Other pages cover fractions, averages, ratios, a GPA, the week number of a date and adding time.
The car and the dog
With the tire size calculator you can compare two tire sizes by diameter and see the speedometer error, and the gas mileage calculator gives miles per gallon and the cost of a trip. For a dog, the dog food calculator estimates the daily calories and the cups of food for a healthy dog, and the dog age calculator turns its age into human years.
Questions people ask
Is UncleSums free?
Yes. Every calculator is free, with no account to make and nothing to sign up for.
Does UncleSums keep what I type?
No. UncleSums does not save or share what you type, and the privacy page has the details.
Do I have to press a button to get the answer?
No. The answer changes as you type, so you can try another number and see the result move.
Can I send a result to someone?
Yes. A Copy result button puts the answer on your clipboard as text, for a message or an email, with a link to the calculator on the last line. A Share button makes a link to the same calculator with your numbers already filled in, so whoever opens it sees your answer. Where your phone or computer has a share sheet, the button opens it, and otherwise the link is copied.
Which year do the tax pages use?
The pages for federal income tax, tax brackets, a refund, self-employment tax, capital gains, a paycheck, a 401(k) and a Roth IRA use the figures for 2026.
How far can I trust a result?
A result is an estimate for planning. Check the figures printed on the product you buy, and ask a professional when a mistake would cost a lot. For a loan, a paycheck or a tax return, your lender, your employer or your tax preparer has the final figures.
Published . Updated .