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Time
Date Calculator: Formula, Examples, and How It Works
A date calculator is a tool that answers questions like: How many days are between two dates? What date is…
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Time
Age Calculator: Formula, Examples, and How It Works
An age calculator looks simple on the surface: you enter a date of birth, select a “today” date (or use…
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Finance
House Affordability Calculator: Formula, Examples, and How It Works
Buying a home is rarely just a question of “How much house can I afford?” It is really a question…
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Finance
Sales Tax Calculator: Formula, Examples, and How It Works
A sales tax calculator answers one question quickly: “What will I actually pay at checkout?” Whether you are buying a…
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Finance
Interest Rate Calculator: Formula, Examples, and How It Works
An interest rate calculator helps you determine the rate being applied to a loan or investment when you already know…
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Finance
401(k) Calculator: Formula, Examples, and How It Works
A 401(k) calculator is a planning tool that estimates how your retirement savings might grow over time based on contributions,…
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Finance
Salary Calculator: Formula, Examples, and How It Works
A salary calculator converts pay between common time bases—hourly, daily, weekly, biweekly, monthly, and annual—using a consistent set of assumptions…
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Finance
Interest Calculator: Formula, Examples, and How It Works
An interest calculator estimates how much interest you will earn (on savings/investments) or pay (on loans/credit) over a specific period.…
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Finance
Auto Loan Calculator: Formula, Examples, and How It Works
An auto loan calculator helps you estimate your monthly car payment, total interest cost, and the total amount you will…
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Finance
Loan Calculator: Formula, Examples, and How It Works
A loan calculator answers a simple question with significant financial consequences: “If I borrow this amount, at this rate, for…
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