Calculator directory
Browse calculators by category
Open finance, health & fitness, math, everyday life, and education calculators from one organized directory. Start with a popular tool, use the finance groupings, or jump directly into a category section below.
Popular tools
Open a common calculator first
Finance01
Mortgage Calculator
Estimate mortgage payments, escrow costs, payoff timing, and amortization from a layout inspired by traditional mortgage worksheets.
Open toolNo signup
Finance18
Investment Calculator
Estimate ending balance, required contribution, required return, required starting amount, or time to target with a fuller compound investment calculator.
Open toolNo signup
Health26
BMI Calculator
Estimate body mass index, compare it with adult BMI categories, and see healthier-weight context for your height.
Open toolNo signup
Math36
Percentage Calculator
Solve percentage-of-a-number questions and percentage change between two values.
Open toolNo signup
Everyday47
Age Calculator
Calculate exact age between two dates and see the result in years, months, and total days.
Open toolNo signup
Education52
GPA Calculator
Estimate weighted GPA from course grades and credit hours.
Open toolNo signup
Finance02
Rent vs. Buy Calculator
Compare buying a home versus renting by combining mortgage costs, property expenses, rent growth, appreciation, selling costs, and investment return assumptions.
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Finance03
APR Calculator
Estimate real APR from loan payments and fees, or compare a mortgage's true annual percentage rate after loan fees, points, and PMI are included.
Open toolNo signup
Finance04
RMD Calculator
Estimate required minimum distributions from retirement accounts using age, balance, return assumptions, and a spouse-beneficiary adjustment when applicable.
Open toolNo signup
Finance05
Bond Calculator
Value coupon bonds on the coupon date, solve for price, yield, face value, coupon, or maturity, and estimate dirty price, clean price, and accrued interest between coupon dates.
Open toolNo signup
Finance calculators
Browse finance tools by planning topic
Finance is the deepest section in the directory, so it is grouped by common use case instead of one long undifferentiated list.
Mortgage
4 toolsLoans
4 toolsInvestment
4 toolsRetirement
4 toolsTax
4 toolsAuto
4 toolsSavings
4 toolsFinance
Finance Calculators
Money tools for borrowing, saving, taxes, investing, and long-range planning.
Finance
Mortgage Calculator
Estimate mortgage payments, escrow costs, payoff timing, and amortization from a layout inspired by traditional mortgage worksheets.
Finance
Rent vs. Buy Calculator
Compare buying a home versus renting by combining mortgage costs, property expenses, rent growth, appreciation, selling costs, and investment return assumptions.
Finance
APR Calculator
Estimate real APR from loan payments and fees, or compare a mortgage's true annual percentage rate after loan fees, points, and PMI are included.
Finance
RMD Calculator
Estimate required minimum distributions from retirement accounts using age, balance, return assumptions, and a spouse-beneficiary adjustment when applicable.
Finance
Bond Calculator
Value coupon bonds on the coupon date, solve for price, yield, face value, coupon, or maturity, and estimate dirty price, clean price, and accrued interest between coupon dates.
Finance
Loan Calculator
Compare amortized loans, deferred maturity payoffs, and bond-style present value math from a single live loan worksheet.
Finance
Auto Loan Calculator
Estimate auto financing from either vehicle price or target monthly payment, with taxes, fees, trade-in equity, and payoff detail.
Finance
Cash Back or Low Interest Calculator
Compare a dealer cash rebate against a low-interest financing offer, then review monthly payment, total interest, tax treatment, and total transaction cost side by side.
Finance
Interest Calculator
Project compound interest growth with recurring contributions, tax drag, inflation adjustment, and visual balance breakdowns.
Finance
Simple Interest Calculator
Solve simple-interest end balance, principal, term, or rate, then review the flat-interest breakdown and the resulting balance schedule without leaving the page.
Finance
Estate Tax Calculator
Estimate federal estate tax by combining estate assets, deductible amounts, lifetime taxable gifts, and the applicable federal exclusion amount for the selected year of death.
Finance
Payment Calculator
Determine either the monthly payment for a fixed-term loan or the payoff time for a fixed monthly payment, with charts and amortization detail.
Finance
Credit Card Payoff Calculator
Build a multi-card debt avalanche payoff plan from one monthly budget, then review payoff timing, interest cost, and card-by-card order.
Finance
Percent Off Calculator
Calculate sale price, original price, or discount rate, including stackable extra discount scenarios and savings breakdowns.
Finance
Commission Calculator
Calculate sales commission, commission rate, or sales price for simple commission plans, and estimate tiered commission with optional base payout.
Finance
Retirement Calculator
Plan retirement across four scenarios: how much you need, how much to save, how much you can withdraw, and how long savings can last.
Finance
Amortization Calculator
Break down a fixed-rate loan into payment, interest, principal, and remaining balance, with support for extra monthly, yearly, and one-time payments.
Finance
Investment Calculator
Estimate ending balance, required contribution, required return, required starting amount, or time to target with a fuller compound investment calculator.
Finance
Inflation Calculator
Compare historical U.S. inflation, project a forward flat rate, or work backward from today's amount with a fuller inflation calculator.
Finance
Finance Calculator
Solve for FV, PMT, I/Y, N, or PV with a fuller time-value-of-money finance calculator, plus a visual schedule and settings summary.
Finance
Income Tax Calculator
Estimate taxable income, federal tax, state tax, withholding, and refund or amount due with a fuller U.S. income tax calculator layout.
Finance
Compound Interest Calculator
Estimate compound growth with an initial principal, recurring additions, compounding frequency, tax drag, and inflation adjustment.
Finance
Salary Calculator
Convert hourly pay or annual salary into daily, weekly, monthly, and yearly equivalents with adjusted and unadjusted work-year assumptions.
Finance
Interest Rate Calculator
Solve for an implied loan interest rate from payment, principal, and term, with repayment visuals for amortized or fixed-principal structures.
Finance
Sales Tax Calculator
Add tax to a subtotal, extract tax from a final total, or solve the implied tax rate from both prices with a fuller sales tax calculator.
Finance
Currency Exchange Calculator
Convert currencies, metals, and selected crypto pairs with OANDA-sourced reference data in a live English interface.
Health & Fitness
Health & Fitness Calculators
Daily health calculators for BMI, calories, body composition, pacing, and pregnancy timing.
Health
BMI Calculator
Estimate body mass index, compare it with adult BMI categories, and see healthier-weight context for your height.
Health
Calorie Calculator
Estimate daily calories needed for maintenance, compare gain and loss targets, switch formulas, and view a sample zigzag schedule in one calorie planner.
Health
Carbohydrate Calculator
Estimate daily carbohydrate intake from activity, calorie needs, and macro targets, then compare balanced, lower-carb, and ketogenic planning ranges.
Health
Body Fat Calculator
Estimate body-fat percentage, lean mass, and fat mass with a circumference-based method inspired by popular body-composition calculators.
Health
BMR Calculator
Estimate basal metabolic rate with several common formulas and see how that resting baseline scales into daily calorie context.
Health
Ideal Weight Calculator
Compare several classic ideal-weight formulas and see how they relate to a standard healthy BMI range for your height.
Health
Pace Calculator
Solve for pace, time, or distance and compare projected event times with a fuller running and walking pace calculator.
Health
Pregnancy Calculator
Estimate due date, conception timing, trimester milestones, and gestational age from several common pregnancy reference points.
Health
Pregnancy Conception Calculator
Estimate conception timing, likely intercourse dates, and reverse pregnancy milestones from due-date, cycle, or ultrasound references.
Health
Due Date Calculator
Estimate due date and milestone dates from conception, last-period, ultrasound, or IVF transfer references.
Math
Math Calculators
Practical math tools for percentages, fractions, statistics, random values, and geometry.
Math
Percentage Calculator
Solve percentage-of-a-number questions and percentage change between two values.
Math
Scientific Calculator
Evaluate common scientific expressions with functions like sin, cos, log, and square root.
Math
Fraction Calculator
Add, subtract, multiply, or divide two fractions and reduce the result automatically.
Math
Random Number Generator
Generate one or more random numbers inside a custom range, with optional unique picks.
Math
Triangle Calculator
Estimate triangle type, perimeter, and area from three side lengths.
Math
Pythagorean Theorem Calculator
Enter any two right-triangle side lengths to solve the third side, verify the theorem, and review the equation step in one geometry tool.
Math
Root Calculator
Solve square roots, cube roots, and general nth roots with live verification and radical notation.
Math
Greatest Common Factor Calculator
Find the greatest common factor of two or more integers, compare prime factorizations, and review Euclidean steps on one page.
Math
Prime Factorization Calculator
Break a positive integer into prime factors, grouped exponents, factor pairs, and divisor structure on one page.
Math
Distance Calculator
Measure distance in 2D coordinates, 3D coordinates, or between latitude-longitude points with live formula steps.
Math
Standard Deviation Calculator
Calculate mean, population standard deviation, and sample standard deviation from a list of numbers.
Everyday Life
Everyday Life Calculators
Utility calculators for dates, time, hours, conversions, networking, passwords, and project tasks.
Everyday
Age Calculator
Calculate exact age between two dates and see the result in years, months, and total days.
Everyday
Date Calculator
Measure the difference between two dates in days, weeks, and full calendar months.
Everyday
Time Zone Calculator
Convert a date and time between UTC offsets, compare the source and destination local times, and check whether the calendar day changes.
Everyday
Time Calculator
Calculate the duration between two clock times, including overnight spans.
Everyday
Hours Calculator
Estimate worked hours between a shift start and end time after subtracting a break.
Everyday
Concrete Calculator
Estimate concrete volume for slabs, round footings, tubes, curb-and-gutter sections, and stairs.
Everyday
Subnet Calculator
Estimate IPv4 network address, broadcast address, host range, and usable host count from CIDR input.
Everyday
Password Generator
Generate a password using selected character types and a custom length.
Everyday
Conversion Calculator
Convert values between common length, weight, and temperature units.
Education
Education Calculators
Academic tools for GPA, grade targets, weighted planning, and classroom calculations.
Popular tools
FAQ
Questions about browsing the calculator directory
How should I use the calculator directory?
Start with a category if you already know the topic, or open a popular calculator first. The directory groups similar tools together so you can compare related options without searching the full site each time.
Does the Finance section only include loan calculators?
No. Finance also includes investment, retirement, tax, savings, and auto-related calculators. The finance groups on this page are meant to help you narrow down the type of planning task you have.
Are all links on this page real calculators?
Yes. Every button and link in the directory points to an existing live calculator route already available on the site.