All Free Online Calculators & Tools — 100+ Finance, Health, Math & More | RyuPy Tools

191 tools

Compound Interest Calculator

Calculate how your savings grow with compound interest over time.

Mortgage Calculator

Calculate monthly mortgage payments, total cost, and amortization.

Loan Calculator

Calculate monthly repayments and total interest for any loan.

Calculate tip amount and split the bill among friends.

Add or remove VAT/tax from any price instantly.

Discount Calculator

Calculate sale price after a percentage or flat discount.

Calculate return on investment for any purchase or project.

Salary Calculator

Convert between hourly, daily, monthly, and annual salaries.

Inflation Calculator

Calculate the inflation-adjusted value of money over time using historical US CPI data.

FIRE Calculator

Calculate your Financial Independence number and how many years until you can retire early.

Savings Goal Calculator

Calculate how long to reach your savings goal, or how much you need to save each month.

Credit Card Payoff Calculator

Calculate how long to pay off credit card debt and how much interest you can save by paying more.

Emergency Fund Calculator

Calculate your ideal emergency fund size based on your monthly expenses.

Calculate your Body Mass Index and see what category you fall in.

Calculate your Basal Metabolic Rate — calories burned at rest.

Calorie Calculator

Calculate daily calorie needs based on your activity level.

Ideal Weight Calculator

Find your ideal body weight range based on height and gender.

Body Fat Calculator

Estimate body fat percentage using measurements.

Percentage Calculator

Find percentages, percentage change, and percentage of totals.

Scientific Calculator

Full scientific calculator with trig, logs, and more.

Fraction Calculator

Add, subtract, multiply, and divide fractions with step-by-step results.

Average Calculator

Calculate mean, median, mode, and range from a list of numbers.

Random Number Generator

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

Length Converter

Convert between meters, feet, miles, km, inches, and more.

Weight Converter

Convert between kg, lbs, stones, ounces, and more.

Temperature Converter

Convert between Celsius, Fahrenheit, and Kelvin.

Speed Converter

Convert km/h, mph, m/s, knots, and more.

Data Storage Converter

Convert bytes, KB, MB, GB, TB instantly.

Currency Converter

Convert between 50+ world currencies with live exchange rates.

Number Base Converter

Convert between binary, octal, decimal, and hexadecimal.

Fuel Economy Converter

Convert MPG (US/UK), L/100km, and km/L with tank range and fuel cost calculator.

Shoe Size Converter

Convert shoe sizes between US Men, US Women, UK, EU, CM, and JP sizing.

Pressure Converter

Convert Pascal, kPa, MPa, Bar, PSI, atm, mmHg, inHg, and more.

Energy Converter

Convert Joules, calories, kWh, BTU, eV, and more energy units.

Calculate exact age in years, months, and days from birthdate.

Date Difference Calculator

Find the number of days, weeks, or months between two dates.

Convert between seconds, minutes, hours, days, weeks, months, years.

See the current time in major cities and timezones around the world.

Timezone Converter

Convert a specific date and time between any two timezones.

Countdown Timer

Count down to any future date or event with days, hours, minutes, and seconds.

Scale any recipe up or down by servings count.

Cooking Measurement Converter

Convert cups, tablespoons, teaspoons, ml, oz, and grams.

Area Calculator

Calculate area of rectangles, circles, triangles, and more.

Volume Calculator

Calculate volume of cubes, cylinders, spheres, and more.

Concrete Calculator

Calculate concrete volume needed for slabs, footings, columns.

Paint Calculator

Calculate how much paint you need for walls and ceilings.

Flooring Calculator

Calculate flooring, tile or carpet needed for any room with waste factor.

Fence Calculator

Calculate posts, panels and materials needed for fencing any perimeter.

Gravel & Mulch Calculator

Calculate volume, weight and cost of gravel, mulch, sand or topsoil.

Wallpaper Calculator

Calculate how many wallpaper rolls you need for a room.

Lumber Calculator

Calculate board feet and lumber quantities for any project.

Stair Calculator

Calculate stair riser height, tread count and stringer length to building code.

Roofing Calculator

Calculate roof area, squares, shingles, and underlayment for any roof shape.

Drywall Calculator

Calculate drywall sheets, screws, joint compound, and tape for any room.

Find your public IP address, location, ISP, and connection info.

Subnet Calculator

Calculate subnet mask, network address, broadcast, and host range.

Look up DNS records (A, AAAA, MX, TXT, CNAME) for any domain.

Open Port Checker

Check if a port is open or closed on any host.

IP Address Converter

Convert IP addresses between decimal, binary, hex, and integer.

Password Generator

Generate secure random passwords with custom rules and strength meter.

Calculate weighted GPA and cumulative GPA by course.

Color Converter

Convert colors between HEX, RGB, HSL, HSB, and CMYK formats.

Count words, characters, sentences, reading time and analyze text.

Unit Price Comparator

Compare price per unit to find the best value product.

Generate MD5, SHA-1, SHA-256 and SHA-512 hashes from text or files.

Base64 Encoder / Decoder

Encode and decode Base64 text, URLs and files including image preview.

URL Encoder / Decoder

Encode and decode URLs and query parameters with component breakdown.

Morse Code Converter

Convert text to Morse code and back with audio playback.

LCM & GCD Calculator

Find the Least Common Multiple and Greatest Common Divisor with step-by-step solution.

Quadratic Equation Solver

Solve ax² + bx + c = 0 with step-by-step working and parabola sketch.

Generation Calculator

Find out which generation you belong to based on your birth year.

Pet Age Calculator

Convert your pet's age to human years — dogs, cats, rabbits, hamsters, guinea pigs, parrots, horses, and tortoises.

Roman Numerals Converter

Convert numbers to Roman numerals and back, with step-by-step breakdown.

Convert text between UPPER, lower, Title, camelCase, snake_case and more.

Lorem Ipsum Generator

Generate Lorem Ipsum placeholder text by paragraphs, sentences or words.

Reading Time Calculator

Calculate how long it takes to read or speak any text.

JSON Formatter & Validator

Format, minify, and validate JSON with syntax highlighting and detailed error info.

Water Intake Calculator

Calculate your daily water intake based on weight, activity and climate.

Calories Burned Calculator

Calculate calories burned during 50+ activities using MET values.

Macros Calculator

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

Blood Pressure Category

Check your blood pressure category and understand what it means for your health.

Heart Rate Zones

Calculate your 5 training heart rate zones using the Karvonen formula.

Estimate your Blood Alcohol Content using the Widmark formula.

Waist-to-Hip Ratio Calculator

Calculate your waist-to-hip ratio and health risk category using WHO standards.

Unix Timestamp Converter

Convert Unix timestamps to dates and back, with live current timestamp.

Business Days Calculator

Count business days between dates or add working days to a date.

Work Hours Calculator

Calculate total work hours and pay from clock-in/out times.

Stopwatch & Timer

Online stopwatch with lap times and countdown timer with alarm.

Look up domain registration info, expiry date and nameservers.

Pregnancy Due Date Calculator

Calculate your estimated due date from your last period, conception date, or IVF transfer.

Ovulation Calculator

Find your ovulation day and fertile window based on your cycle length.

Sleep Calculator

Find the best bedtime or wake time based on 90-minute sleep cycles.

VO2 Max Calculator

Estimate your VO2 max fitness level using multiple test methods.

One Rep Max Calculator

Calculate your 1RM from any weight and rep count using multiple formulas.

Love Calculator

Find out your love compatibility percentage — just for fun!

Text Diff Checker

Compare two texts side by side and highlight differences.

Repeat any text a specified number of times.

Remove Duplicate Lines

Remove duplicate lines from text instantly.

Sort Text Lines

Sort lines alphabetically, reverse, by length, or randomly.

Reverse your text by characters, words, or lines.

Count individual letters and character frequencies in text.

Sentence Counter

Count sentences and get detailed text statistics.

Generate clean URL-friendly slugs from any text.

Whitespace Remover

Remove extra spaces, tabs, and blank lines from text.

Markdown to HTML

Convert Markdown syntax to clean HTML code.

CSV to JSON Converter

Convert between CSV and JSON formats instantly.

Convert text to binary and binary back to text.

Find and Replace

Find and replace text with regex support.

Test regular expressions with live matching and highlighting.

HTML Entity Encoder

Encode and decode HTML entities.

Pick colors visually and get HEX, RGB, and HSL values.

HEX to RGB Converter

Convert between HEX and RGB color formats.

Color Palette Generator

Generate harmonious color palettes from any base color.

Color Contrast Checker

Check WCAG accessibility contrast ratios between colors.

Gradient Generator

Create beautiful CSS gradients with live preview.

Shades & Tints Generator

Generate lighter and darker variations of any color.

Random Color Generator

Generate random colors with copy-ready codes.

Blend two colors together and get intermediate steps.

CMYK to RGB Converter

Convert between CMYK and RGB color formats.

HSL to HEX Converter

Convert between HSL and HEX color formats.

Password Strength Checker

Test how strong your password is with detailed analysis.

Generate random UUIDs (v4) and other UUID versions.

Random String Generator

Generate random strings with custom length and characters.

Bcrypt Generator

Generate and verify bcrypt password hashes.

Decode and inspect JSON Web Token payloads.

HTPASSWD Generator

Generate Apache htpasswd entries for basic auth.

API Key Generator

Generate secure random API keys and tokens.

Checksum Calculator

Calculate file checksums using MD5, SHA-1, SHA-256.

Compare two blocks of code or text with highlighted differences.

Cron Expression Generator

Build and understand cron schedule expressions visually.

Format and beautify SQL queries for readability.

Format and validate XML documents.

YAML to JSON Converter

Convert between YAML and JSON formats.

Markdown Preview

Write Markdown and see rendered HTML in real time.

CSS Minifier & Beautifier

Minify or beautify CSS code.

JS Minifier & Beautifier

Minify or beautify JavaScript code.

HTML Minifier & Beautifier

Minify or beautify HTML markup.

User Agent Parser

Parse and decode browser user agent strings.

HTTP Status Codes

Quick reference for all HTTP status codes.

String Escape & Unescape

Escape and unescape special characters in strings.

QR Code Generator

Generate QR codes for URLs, text, WiFi, and vCard.

Barcode Generator

Generate barcodes in multiple formats.

Grade Calculator

Calculate your overall grade from weighted assignments.

Final Grade Calculator

Find what you need on your final exam.

CGPA Calculator

Calculate cumulative GPA across multiple semesters.

Income Tax Calculator

Estimate federal income tax with brackets and deductions.

Auto Loan Calculator

Calculate monthly car loan payments and total cost.

Amortization Calculator

See full payment schedule with principal and interest breakdown.

Retirement Calculator

Plan your retirement savings with growth projections.

Investment Calculator

Calculate investment returns with regular contributions.

Net Worth Calculator

Track assets minus liabilities for your total net worth.

Debt-to-Income Calculator

Calculate your DTI ratio for mortgage qualification.

Down Payment Calculator

Plan your home down payment savings timeline.

Markup & Margin Calculator

Convert between markup percentage and profit margin.

Profit Calculator

Calculate profit, revenue, and cost relationships.

Break-Even Calculator

Find your break-even point in units or revenue.

Sales Tax Calculator

Calculate sales tax amount and total price.

Standard Deviation Calculator

Calculate standard deviation, variance, and statistical measures.

Square Root Calculator

Calculate square roots, cube roots, and nth roots.

Exponent Calculator

Calculate powers and exponential expressions.

Triangle Calculator

Calculate sides, angles, area, and perimeter of triangles.

Pythagorean Theorem Calculator

Find the missing side of a right triangle.

Slope Calculator

Calculate slope, distance, and midpoint between two points.

Long Division Calculator

Solve long division with step-by-step work shown.

Prime Number Calculator

Check if a number is prime and find prime factors.

Probability Calculator

Calculate probability of single and combined events.

Combinations & Permutations

Calculate nCr and nPr for counting problems.

Ratio Calculator

Simplify ratios and solve proportions.

Rounding Calculator

Round numbers to any decimal place or significant figure.

Significant Figures Calculator

Count and round to significant figures.

Matrix Calculator

Add, subtract, multiply matrices and find determinants.

Logarithm Calculator

Calculate logarithms in any base.

TDEE Calculator

Calculate Total Daily Energy Expenditure for diet planning.

Pace Calculator

Calculate running or walking pace, time, and distance.

Protein Calculator

Calculate daily protein needs based on goals and activity.

Calorie Deficit Calculator

Plan your calorie deficit for weight loss goals.

Heart Rate Zone Calculator

Calculate training zones for optimal workouts.

Volume Converter

Convert between liters, gallons, cups, milliliters, and more.

Convert between square feet, square meters, acres, and hectares.

Angle Converter

Convert between degrees, radians, and gradians.

Frequency Converter

Convert between Hz, kHz, MHz, GHz, and more.

Military Time Converter

Convert between 12-hour and 24-hour time formats.

Week Number Calculator

Find the ISO week number for any date.

Tile Calculator

Calculate tiles needed for floors and walls with waste factor.

Deck Calculator

Estimate decking boards, posts, and materials needed.

Brick Calculator

Calculate bricks and mortar needed for walls and projects.

Oven Temperature Converter

Convert between Fahrenheit, Celsius, and gas marks.

Cooking Time Calculator

Adjust cooking times for different weights and temperatures.

Serving Size Calculator

Scale ingredient quantities for any number of servings.

MAC Address Lookup

Look up manufacturer info from MAC addresses.

CIDR Calculator

Calculate IP ranges and subnet details from CIDR notation.