What calculators are included?

The hub currently organizes financial (mortgage, loan, interest), health (BMI, calorie), math (scientific, percentage), and everyday calculators (age, date), with more on the way.

Are my inputs saved or shared?

No. Calculations run entirely in your browser. Nothing is uploaded, stored, or logged.

My Calculator Monkey

A free online calculator collection — financial, health, math, and everyday calculators in one place.

Jump to:Financial 14 Fitness & Health 9 Math 6 Other 10

Popular calculators

Percentage Calculator

Compound Interest Calculator

Financial

Financial Calculators14

Plan loans, mortgages, and interest with confidence.

Mortgage Calculator

Estimate monthly mortgage payments and total interest.

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Loan Calculator

Calculate loan payments, schedules, and total cost.

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Auto Loan Calculator

Plan a car loan with trade-in, down payment, and sales tax.

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Payment Calculator

Calculate payments at monthly, bi-weekly, or weekly frequencies.

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Retirement Calculator

Project retirement savings from contributions and returns.

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Amortization Calculator

See a full payment schedule with principal and interest.

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Investment Calculator

Forecast future value of investments with regular contributions.

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Inflation Calculator

See how inflation erodes purchasing power over time.

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Sales Tax Calculator

Calculate sales tax and final price for any purchase.

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Finance Calculator

Solve for FV, PV, rate, periods, or payment using the time value of money.

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Income Tax Calculator

Estimate taxable income, federal tax, and after-tax pay.

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Compound Interest Calculator

Project balance with compounding and regular contributions.

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Salary Calculator

Convert between hourly, weekly, monthly, and annual pay.

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Interest Rate Calculator

Estimate the rate on a loan from amount, payment, and term.

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Fitness & Health Calculators9

Track body measurements and daily nutrition targets.

BMI Calculator

Calculate Body Mass Index from height and weight.

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Calorie Calculator

Estimate daily calorie needs based on activity level.

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Body Fat Calculator

Estimate body fat % using the U.S. Navy method.

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BMR Calculator

Find your basal metabolic rate and daily calorie targets.

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Ideal Weight Calculator

Estimate ideal weight range using multiple common formulas.

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Pace Calculator

Calculate running pace per mile or kilometer and average speed.

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Pregnancy Calculator

Estimate due date, current week, and trimester from your LMP.

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Pregnancy Conception Calculator

Estimate conception date range and fertile window.

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Due Date Calculator

Estimate due date from LMP, conception, or IVF transfer.

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Math Calculators6

From quick percentages to scientific operations.

Scientific Calculator

Trigonometry, logarithms, exponents, and more.

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Percentage Calculator

Solve any percentage problem in one click.

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Fraction Calculator

Add, subtract, multiply, divide, and simplify fractions.

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Random Number Generator

Generate random numbers in any range, with or without duplicates.

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Triangle Calculator

Solve missing sides and angles, area, and perimeter.

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Standard Deviation Calculator

Mean, variance, and population or sample standard deviation.

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Other Calculators10

Everyday helpers for dates, ages, and timelines.

Age Calculator

Calculate exact age in years, months, and days.

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Date Calculator

Add, subtract, and compare dates with ease.

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Time Calculator

Add, subtract, and convert hours, minutes, and seconds.

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Hours Calculator

Calculate work hours from start, end, and break.

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GPA Calculator

Calculate GPA on the 4.0 scale from grades and credits.

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Grade Calculator

Compute weighted course grades from assignment scores.

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Concrete Calculator

Estimate concrete volume and bags for slabs, footings, and columns.

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Subnet Calculator

Compute network, broadcast, mask, and usable host range from CIDR.

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Password Generator

Create strong, random passwords with custom rules.

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Conversion Calculator

Convert length, weight, temperature, and volume units.

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About My Calculator Monkey

My Calculator Monkey is a free online calculator collection. Browse specialized calculators across Financial, Fitness & Health, Math, and everyday utilities — all in one consistent, no-signup interface. New calculators are added regularly.