Precise calculators for everyday decisions

Amortization Schedule

Generate a full month-by-month amortization table showing the principal and interest split for every payment.

Auto Loan Calculator

Calculate monthly car payments, total interest, and true cost of ownership for any auto loan.

Compound Interest Calculator

See how your savings or investment grows with compound interest over time.

Credit Card Payoff Calculator

Compare the cost of paying only the minimum versus a fixed monthly payment on your credit card balance.

Debt Payoff Planner

Compare the snowball (smallest balance first) and avalanche (highest rate first) debt payoff strategies side by side.

Debt-to-Income Ratio Calculator

Calculate your debt-to-income (DTI) ratio and see how lenders evaluate your ability to take on new debt.

Discount Calculator

Find the sale price after a percentage discount, or work out what discount was applied.

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Down Payment Calculator

Calculate the down payment amount needed for any home price and see how long it will take to save.

Health & Fitness

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BMI Calculator

Calculate your Body Mass Index with metric or imperial inputs and see your weight category.

BMR Calculator

Calculate your Basal Metabolic Rate using the gold-standard Mifflin-St Jeor equation.

Body Fat Calculator

Estimate body fat percentage using the clinically validated U.S. Navy circumference method.

Calorie Calculator

Estimate your daily calorie needs based on age, weight, height, sex, and activity level.

Due Date Calculator

Calculate your estimated due date by last period or conception date, with weeks pregnant and trimester shown.

Ideal Weight Calculator

See your ideal weight from three medical formulas (Devine, Robinson, Hamwi) plus your healthy BMI weight range.

Macro Calculator

Calculate your daily protein, carbs, and fat targets based on your calorie needs and fitness goal.

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One-Rep Max Calculator

Estimate your 1RM for any lift using Epley and Brzycki formulas, plus a training percentage table.

Math & Numbers

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Average Calculator

Find the arithmetic mean of any set of numbers with a clear step-by-step breakdown.

Fraction Calculator

Add, subtract, multiply, or divide fractions and mixed numbers with step-by-step working shown.

GPA Calculator

Calculate your GPA from course grades and credit hours using the standard 4.0 scale.

Grade Calculator

Calculate your current grade and find what score you need on the final exam to reach your target grade.

LCM & GCF Calculator

Calculate the LCM and GCF of up to 10 numbers with full prime factorization working shown.

Percentage Calculator

Calculate percentages three ways: percentage of, what percent, and percentage change.

Prime Factorization Calculator

Find the prime factors of any positive integer with a factor tree diagram and prime factor notation shown.

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Probability Calculator

Calculate the probability of single and combined events, including AND, OR, and NOT logic.

Dates & Time

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Add or Subtract Days

Add or subtract any number of days from a date and find the resulting date instantly.

Age Calculator

Calculate your exact age in years, months, days, hours, and minutes from any birth date.

Countdown Calculator

Count down the exact days, hours, and minutes remaining until any future date.

Date Difference Calculator

Find the exact number of days, weeks, months, and years between any two dates.

Hours Calculator

Add or subtract hours and minutes to calculate total time worked or elapsed time.

Time Zone Converter

Compare the current time across up to 4 cities worldwide with automatic DST handling.

Converters

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Air Fryer Converter

Convert conventional oven temperature and time to air fryer settings using the standard reduction rule.

Angle Converter

Convert between degrees, radians, gradians, and other angle units instantly.

Area Converter

Convert square feet, acres, hectares, square meters, and more with one click.

Cups to Grams Converter

Convert cups to grams for any baking ingredient using accurate per-ingredient density data.

Data Storage Converter

Convert between bytes, KB, MB, GB, TB, and other storage units with precision.

Energy Converter

Convert joules, calories, kilowatt-hours, BTU, and other energy units instantly.

Frequency Converter

Convert between hertz, kilohertz, megahertz, gigahertz, and other frequency units.

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Length Converter

Convert meters, feet, inches, kilometers, miles, and 15 other length units instantly.

Text Tools

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Case Converter

Convert text to UPPER CASE, lower case, Title Case, camelCase, or snake_case instantly.

Comma Separator

Turn a list of items into a comma-separated string — or split a CSV back into a list.

Number to Words

Spell out any number in plain English words — useful for checks and legal documents.

Random Word Generator

Generate random English words for writing prompts, games, or vocabulary practice.

Remove Line Breaks

Remove line breaks and extra whitespace to turn multi-line text into one clean paragraph.

Roman Numerals Converter

Convert between Arabic numbers and Roman numerals up to 3999 instantly.

Text Sorter

Sort a list of words or lines alphabetically, reverse alphabetically, or randomly.

Word Counter

Count words, characters, sentences, and paragraphs in any text — as you type.

Image Tools

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Favicon Generator

Generate a multi-size favicon ICO from any PNG image — all in your browser.

Image Compressor

Reduce image file size with a quality slider — files never leave your device.

Image Converter

Convert images between JPG, PNG, and WebP formats entirely in your browser.

Image Resizer

Resize any image to exact pixel dimensions while preserving aspect ratio.

Image to Base64

Encode an image to a Base64 data URI for embedding directly in HTML or CSS.

Rotate & Flip Image

Rotate or flip any image 90°, 180°, or mirror it horizontally or vertically.

Utilities

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Color Converter

Convert colors between HEX, RGB, and HSL formats with a live color swatch preview.

CPS Test

Test your clicks per second with 5, 10, or 15-second timed tests and see your CPS rating.

Keyboard Tester

Press any key to see it light up on a visual keyboard layout. Test for stuck or broken keys.

Microphone Test

Test your microphone with a live volume level meter. Audio is processed locally — nothing is recorded or uploaded.

Password Generator

Generate a strong, random password with custom length and character requirements.

QR Code Generator

Generate a QR code for any URL, text, or Wi-Fi network and download it as a PNG.

Random Number Generator

Generate one or more random numbers within any range you specify.