Calculator directory

Free online calculators — finance, health, math, and conversions

Pick a category or jump to the section you need. Each calculator opens instantly in your browser.

Finance Calculators

Mortgage, loan, tax, salary, savings, retirement, ROI, debt payoff, and real estate planning calculators.

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Health tracking

Health Calculators

BMI, calorie, macro, pregnancy, ovulation, sleep, hydration, and body composition calculators.

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Math Calculators

Scientific, graphing, algebra, derivative, integral, matrix, statistics, and equation solving calculators.

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Everyday conversion

Unit & Conversion Calculators

Time zone, temperature, distance, weight, volume, epoch, hex, and measurement conversion calculators.

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Featured calculators

These are the most common calculator workflows people look for first.

Mortgage Calculator

Estimate monthly payments, total interest, and amortization quickly.

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BMI Calculator

Calculate body mass index with a straightforward height and weight workflow.

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Scientific Calculator

Handle scientific operations, formulas, and classroom-friendly calculations.

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Time Zone Converter

Convert between time zones for meetings, travel, and remote collaboration.

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Days From Today Calculator

Find exact future or past dates for 30, 60, 90, or any custom number of days.

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Compound Interest Calculator

Model long-term growth using contributions, rate of return, and time.

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SIP Calculator

Estimate monthly systematic investment plan growth and maturity value.

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Calorie Calculator

Estimate daily calorie needs for maintenance, loss, or gain goals.

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Finance Calculators

For mortgages, loans, taxes, investing, debt payoff, affordability, salary, and real estate decisions.

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Mortgage Calculator

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Loan Calculator

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Compound Interest Calculator

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FIRE Calculator

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Investment Calculator

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Retirement Calculator

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Show all 18 more in Finance Calculators

Savings Calculator Debt Payoff Calculator Salary Calculator Currency Converter EMI Calculator Net Worth Calculator House Affordability Calculator Amortization Calculator Closing Cost Calculator Rent vs Buy Calculator ROI Calculator Stock Profit Calculator Inflation Calculator Cap Rate Calculator Tip Calculator Margin / Markup Calculator Time Card Calculator BRRRR Calculator

Health Calculators

For body metrics, nutrition planning, pregnancy tracking, sleep goals, hydration, and wellness estimates.

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Calorie Calculator

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Macro Calculator

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TDEE Calculator

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Water Intake Calculator

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Body Fat Calculator

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Ideal Weight Calculator

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Heart Rate Zone Calculator

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Pregnancy Calculator

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Show all 3 more in Health Calculators

Ovulation Calculator Sleep Calculator Blood Type Calculator

Math Calculators

For equations, graphs, algebra, trigonometry, statistics, matrices, derivatives, and classroom problem solving.

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Scientific Calculator

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Graphing Calculator

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Equation Solver

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Derivative Calculator

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Integral Calculator

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Trigonometry Calculator

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Statistics Calculator

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Standard Deviation Calculator

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Show all 9 more in Math Calculators

Probability Calculator Matrix Calculator Fraction Calculator Factorial Calculator Prime Number Calculator Quadratic Formula Calculator Permutation Combination Calculator Logarithm Calculator Percentage Calculator

Unit & Conversion Calculators

For temperature, length, volume, time, data format, and unit conversions used in work, travel, and study.

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Time Zone Converter

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Days Between Dates Calculator

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Days From Today Calculator

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Business Days Calculator

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Square Feet Calculator

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Celsius to Fahrenheit

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Show all 7 more in Unit & Conversion Calculators

CM to Inches MM to Inches Meters to Feet Liters to Gallons OZ to ML Hex to Decimal Epoch Converter

Calculators FAQ

What calculators are included on this page?

This calculators page includes finance calculators, health calculators, math calculators, and unit or conversion calculators. It works as the main directory for the broader calculator library.

Can I find health, math, and unit calculators here too?

Yes. In addition to finance tools, this page links to health calculators like BMI and calorie calculators, math tools like scientific and graphing calculators, and unit converters like time zone and measurement calculators.

Are all calculators free to use?

Yes. The calculators linked from this page are free to use and open directly in the browser without account creation.

Which calculator categories are most popular?

Popular categories usually include mortgage and loan calculators, BMI and calorie calculators, scientific and graphing calculators, and common conversion tools such as time zone and unit converters.