Mortgage Calculator
Estimate a mortgage payment with principal, interest, property tax, home insurance, and total borrowing cost.
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Clear math. Useful answers.
Free Online Calculators
Fast, accurate, and easy-to-use calculators for finance, math, health, time, business, and everyday calculations.
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- Works in your browser
- Formulas explained
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View all calculatorsCalculators people use every day
Loan Calculator
Calculate a fixed loan payment, total repayment, and total interest for a standard amortized loan.
Use calculatorTime Calculator
Calculate elapsed time between two clock times, including overnight spans and an optional break.
Use calculatorPercentage Calculator
Find a percentage of a number, determine what percent one value is of another, or measure percentage change.
Use calculatorAge Calculator
Find exact age in years, months, and days on any chosen date, plus total elapsed days and the next birthday.
Use calculatorBMI Calculator
Estimate body mass index from metric or imperial measurements and view the standard adult screening range.
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Explore categoriesCalculator categories
Finance
Plan savings, investments, returns, and long-term financial goals with transparent formulas.
1 calculatorMortgage & Loans
Estimate monthly payments, borrowing costs, and interest before comparing loan offers.
2 calculatorsSalary & Work
Convert pay rates and understand earnings across hourly, weekly, monthly, and annual periods.
2 calculatorsMath
Calculate GPA, target grades, averages, and common number problems with clear working.
3 calculatorsPercentage
Calculate percentages, percentage changes, discounts, and attendance targets with clear formulas.
2 calculatorsTime & Date
Find ages, durations, date differences, workdays, and elapsed time accurately.
4 calculatorsConversion
Scale recipe servings and ingredient quantities with a clear, reusable multiplier.
1 calculatorHealth & Fitness
Explore general health measurements with transparent limits and responsible interpretation.
3 calculatorsBusiness
Estimate concrete, paint, flooring, and roofing quantities for practical project planning.
4 calculatorsEveryday Life
Handle tips, discounts, shared bills, and other practical daily calculations in seconds.
3 calculatorsNew tools
Recently added calculators
Concrete CalculatorEstimate slab concrete volume with metric or imperial dimensions, waste allowance, and bag quantities.→Paint CalculatorEstimate paint volume and whole containers from surface area, coats, coverage, and waste.→Flooring CalculatorCalculate room area, flooring with waste, and the number of packages required.→Roofing CalculatorEstimate sloped roof area, roofing squares, waste, and approximate shingle bundles.→
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Scaling tools
Resize a recipe without guesswork
Scale any ingredient amount up or down when changing the number of recipe servings. Enter the original and desired servings to get an exact ingredient multiplier.
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View all guidesHelpful calculation guides
How to Calculate a Percentage
Understand the three percentage formulas used most often, with practical examples and common mistakes to avoid.
Read guideHow Does Compound Interest Work?
A practical explanation of compound growth, the standard formula, recurring contributions, and realistic assumptions.
Read guideHow to Calculate an Hourly Rate from Salary
Convert salary to hourly pay accurately by making work hours, paid weeks, and excluded compensation explicit.
Read guideHow to Calculate a Mortgage Payment
See how loan principal, rate, term, taxes, and insurance combine into a practical monthly mortgage estimate.
Read guideA useful answer, not just a widget
Find the right calculator and understand the result
Calcora offers free online calculators for borrowing, saving, salary, percentages, dates, grades, health, projects, recipes, and daily decisions. Search by question or browse a focused category to reach the right tool in one or two steps.
Every page shows the formula, a worked example, assumptions, and related resources. The tools run locally in your browser wherever practical, so results appear quickly without requiring registration.
Common questions
Frequently asked questions
Are the calculators free to use?
Yes. Every calculator is free, works without an account, and can be used as often as needed.
How are calculator results checked?
Each calculator uses a reusable calculation module with documented formulas, validation, edge-case handling, and automated unit tests.
Do calculator results replace professional advice?
No. Financial and health results are educational estimates. Important decisions should use official information and appropriately qualified advice.
Can I use the calculators on a phone?
Yes. Inputs, buttons, search, and result layouts are designed mobile-first and work with touch, keyboards, and screen readers.