All Tools
Every ToolNest tool in one place. More are added every week.
Calculators
Mortgage Calculator
Monthly payment with taxes, insurance and PMI
Open tool →Down Payment Calculator
Cash to close, PMI and months needed to save
Open tool →Retirement Calculator
Projected nest egg and 4% rule income
Open tool →Loan Calculator
Monthly payment, total interest and total cost
Open tool →Percentage Calculator
X% of Y, what percent, and percentage change
Open tool →Tip Calculator
Tip amount, total, and even bill split
Open tool →Age Calculator
Exact age in years, months and days
Open tool →Discount Calculator
Sale price, savings and stacked discounts
Open tool →VAT Calculator
Add or remove VAT / GST at any rate
Open tool →Inflation Calculator
US dollar value across 1980–2025, CPI-based
Open tool →Sales Tax Calculator
Add tax to a price or strip it out of a total
Open tool →ROI Calculator
Net profit, total return and annualized ROI
Open tool →Break-Even Calculator
Units and revenue needed to cover fixed costs
Open tool →Pay Raise Calculator
New salary and extra per paycheck after a raise
Open tool →Overtime Pay Calculator
Time and a half, weekly and annual totals
Open tool →Time Card Calculator
Weekly hours, breaks, overtime and gross pay
Open tool →Aspect Ratio Calculator
Resize without distortion — social media presets
Open tool →Compound Interest Calculator
Savings growth with monthly contributions
Open tool →Salary to Hourly Calculator
Convert annual salary to hourly and back
Open tool →Grade Calculator
Test percentages and final exam grade needed
Open tool →Savings Goal Calculator
Months to reach a target with interest
Open tool →CD Maturity Calculator
Certificate of deposit value at maturity
Open tool →Loan Payoff Calculator
Pay off early and save interest
Open tool →APY Calculator
Convert APR to annual percentage yield
Open tool →Credit Card Payoff Calculator
Months to pay off a balance and total interest
Open tool →Debt-to-Income Calculator
Front-end and back-end DTI for mortgages
Open tool →401(k) Calculator
Retirement balance with employer match
Open tool →Net Worth Calculator
Assets minus liabilities, and how you compare
Open tool →Investment Fee Calculator
The long-run cost of expense ratios
Open tool →Refinance Calculator
Compare payments, savings and break-even point
Open tool →Interest Calculator
Compound or simple interest and future value
Open tool →Profit Margin Calculator
Revenue, cost, margin and markup — in any direction
Open tool →Converters
Unit Converter
Length, weight and temperature — metric & US units
Open tool →Minutes to Hours Converter
Decimal hours and hh:mm, both directions
Open tool →Roman Numeral Converter
Convert numbers to and from Roman numerals, up to 3999
Open tool →Base Converter
Convert between binary, decimal, hex and octal instantly
Open tool →Automotive
Fuel Cost Calculator
Trip gas cost in MPG or L/100km, with cost split
Open tool →Fuel Efficiency Calculator
Real-world MPG and L/100km from a fill-up
Open tool →Speed Calculator
Solve distance, time or speed — mph, km/h, knots
Open tool →Pace Calculator
Running pace, race splits and predicted times
Open tool →Car Loan Calculator
Monthly payment, tax, trade-in and total cost
Open tool →Text & Writing
Word Counter
Words, characters, sentences and reading time
Open tool →Case Converter
UPPERCASE, lowercase, Title Case and more
Open tool →Lorem Ipsum Generator
Placeholder text by paragraphs, words or lists
Open tool →Remove Duplicate Lines
Strip duplicate lines and sort your list in one click
Open tool →Date & Time
Date Difference Calculator
Days, weeks and calendar breakdown between dates
Open tool →Time Zone Converter
Convert any time between zones, DST-aware
Open tool →Date Calculator
Add or subtract days, weeks, months and years from a date
Open tool →Countdown Calculator
How many days, weeks and months until any date
Open tool →Health & Fitness
BMI Calculator
Body Mass Index with WHO weight category
Open tool →Water Intake Calculator
Daily hydration goal by weight and activity
Open tool →Sleep Calculator
Best bedtime and wake-up times by sleep cycle
Open tool →Calorie Calculator
Daily calories to maintain, lose or gain weight
Open tool →Body Fat Calculator
Estimate body fat % with the US Navy method
Open tool →Due Date Calculator
Estimate your pregnancy due date from the last period
Open tool →Student
Home & Renting
Rent Split Calculator
Split rent equally, by income or by room
Open tool →Square Footage Calculator
Room area with sections and price per sq ft
Open tool →Concrete Calculator
Cubic yards, bags and cost for a slab
Open tool →Paint Calculator
Gallons of paint per room, doors and windows deducted
Open tool →Electricity Cost Calculator
What any appliance costs per day, month and year
Open tool →Unit Price Calculator
Compare cost per unit and find the better deal
Open tool →Rent vs Buy Calculator
True long-term cost of renting vs owning
Open tool →Wedding Budget Calculator
Plan a wedding budget and split it across categories
Open tool →Everyday Utilities
Password Generator
Cryptographically secure random passwords
Open tool →Random Number Generator
Crypto-secure numbers in any range
Open tool →Dog Age Calculator
Real dog-to-human years by breed size
Open tool →Bill Splitter
Split a bill, tip and tax by person or share — fair and fast
Open tool →Random Picker
Pick a random winner from a list — fair and instant
Open tool →Image Tools
Image Format Converter
Convert PNG, JPG and WebP to any format in your browser
Open tool →Image Compressor
Shrink images with a quality slider and preview the size saved
Open tool →Image Resizer
Resize by pixels or percentage while keeping aspect ratio
Open tool →Image to Base64
Turn any image into a copy-paste data URL
Open tool →Base64 to Image
Decode a data URL back into a downloadable image
Open tool →Image Rotate & Flip
Rotate 90°/180° and flip horizontal or vertical
Open tool →File & Document Converters
Markdown to HTML
Convert Markdown into clean HTML you can copy or download
Open tool →CSV to JSON
Turn spreadsheet CSV into structured JSON
Open tool →JSON to CSV
Flatten a JSON array into CSV rows
Open tool →JSON to YAML
Convert JSON into readable YAML
Open tool →XML to JSON
Parse XML into a JSON object
Open tool →YAML to JSON
Convert YAML into JSON
Open tool →Color Tools
Color Converter
Convert between HEX, RGB and HSL live
Open tool →Color Picker
Pick a color and copy it in any format
Open tool →Contrast Checker
WCAG AA/AAA pass/fail for any text on a background
Open tool →Gradient Generator
Build a CSS gradient from two colors and copy it
Open tool →Random Color Generator
Generate random colors or a full palette
Open tool →Color Shades Generator
Tints and shades from any base color
Open tool →Developer Tools
JSON Formatter
Pretty-print and validate JSON instantly
Open tool →JSON Minify
Strip whitespace and compact JSON
Open tool →Base64 Encoder
Encode and decode text to and from Base64
Open tool →URL Encoder
Percent-encode and decode URLs and query strings
Open tool →Hash Generator
SHA-256/384/512 hashes in your browser
Open tool →Timestamp Converter
Unix timestamp to date and back
Open tool →Password & Security
Password Strength Checker
Rate your password and see its real weakness
Open tool →UUID Generator
Generate RFC-4122 v4 UUIDs with the Web Crypto API
Open tool →Credit Card Validator
Verify a card number with the Luhn algorithm
Open tool →Passphrase Generator
Build memorable, strong passphrases
Open tool →Text Encryptor
AES-encrypt text with a password — stays on your device
Open tool →JWT Decoder
Decode a JWT and inspect its header and claims
Open tool →Web & SEO Tools
Regex Tester
Test regular expressions and see live matches
Open tool →HTML Entity Encoder
Encode or decode HTML entities and named characters
Open tool →Text Diff Checker
Compare two blocks of text line by line
Open tool →Slug Generator
Turn any title into an SEO-friendly URL slug
Open tool →Meta Tag Generator
Build title, description and Open Graph tags
Open tool →Robots.txt Generator
Create a robots.txt ruleset with a sitemap
Open tool →