United States calculators
Quick, clear answers for money, work, home and everyday life — with the right currency, tax labels, and examples for United States.
Available calculators
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Age Calculator
Find out your exact age in years, months, days, total days alive, and how long until your next birthday.
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BMI Calculator
Calculate your body mass index from height and weight — in imperial (ft+in/lb) or metric (cm/kg), with the WHO category band.
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Break-Even Calculator
Find the number of units you need to sell to cover fixed costs — and how many more to hit a target profit.
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Calorie Needs Calculator
Find your BMR and total daily calorie needs from age, sex, height, weight, and activity level — using the Mifflin-St Jeor equation.
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Compound Interest Calculator
Estimate how your savings, investment account, 401(k), or retirement fund could grow over time.
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Days Between Dates Calculator
Count the exact number of days, weeks, months, and years between any two dates.
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Deadline Calculator
Add or subtract any number of days, weeks, months, or years from a start date — and see the resulting deadline.
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Flooring Calculator
Find out the floor area, waste allowance, and exact boxes of laminate, LVT, or hardwood flooring you need to buy.
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Gross Margin Calculator
Enter a selling price and the cost of goods sold to find your gross margin — and the equivalent markup, side by side.
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Hourly to Salary Calculator
Work out the annual, weekly, and monthly equivalent of an hourly rate — at any working pattern, gross of tax.
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Loan Repayment Calculator
Work out your monthly payment on a personal loan, auto loan, or debt consolidation — and see how paying a little extra each month saves interest.
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Markup Calculator
Enter cost and selling price to find the markup percentage — and the gross margin it works out to, side by side.
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Meeting Cost Calculator
Calculate what a meeting really costs in dollars — and watch the cost climb live during the meeting. Especially useful for justifying fewer or shorter recurring meetings.
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Mortgage Payment Calculator
Calculate your monthly mortgage payment with optional taxes, insurance, and PMI (PITI). See your total interest, LTV, and how overpaying can shorten your loan.
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Moving Cost Calculator
Get a rough estimate of your moving cost based on home size, hours, and distance — with a typical low–high range.
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Notice Period Calculator
Find out your last working day from the date you give notice and your notice period.
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Paint Calculator
Find out how much paint you need for a room — based on wall dimensions, doors, windows, and the number of coats.
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Percentage Calculator
Quickly work out a tip, a discount, a price change, or a markup — five percentage tools on one page.
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Rent Affordability Calculator
Find out how much rent you can comfortably afford based on your gross income — at the 30% rule of thumb or any other threshold.
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Reverse Sales Tax Calculator
Got a tax-inclusive price? Work backwards to find the pre-tax amount and the sales tax — at any state-and-local rate.
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Running Pace Calculator
Calculate running pace, finish time, or distance from any two of the three — with race-time projections for 5K, 10K, half marathon, and marathon.
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Salary to Hourly Calculator
Convert an annual salary to an hourly, weekly, and monthly figure — at any working week, gross of tax.
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Steps to Miles Calculator
Convert step counts into distance — at walking, jogging, or running pace — using a stride estimate from your height.
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Sales Tax Calculator
Add sales tax to a price, or work out the pre-tax amount from a tax-inclusive total — at any state-and-local rate.
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Working Days Calculator
Count business days (Monday to Friday) between two dates — with optional federal or state holiday exclusion.
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Why use Online CalcKit?
- • No sign-up, no tracking-heavy ads — just clear answers.
- • Mobile-friendly: get a result on your phone in seconds.
- • Plain-English explanations of what each number means.
- • Region-specific defaults, currency, and tax labels for United States.