Utility Calculators
Free utility calculators — QR codes, password strength, color converters, unit helpers and other handy everyday tools.
Small tools that answer small questions fast — password entropy, QR codes, color conversions, unit helpers. Each one runs client-side, states exactly what it does and does not do, and never sends your input anywhere.
QR Code Generator
Generate QR codes for any text or URL
Password Generator
Generate strong passwords
Color Converter
Convert between HEX, RGB, HSL
Universal Unit Converter
Convert between any units
Number Base Converter
Convert between binary, decimal, hex
Hash Generator
Generate SHA-256 hash
Lorem Ipsum Generator
Generate placeholder text
UUID Generator
Generate UUID v4
Bill Split & Tip
Split bill and calculate tip
Countdown Timer Calculator
Calculate time until a future event
File Size Converter
Convert file size units (B, KB, MB, GB)
Salary to Hourly Converter
Convert annual salary to hourly rate
Area Calculator
Calculate area of common shapes
Volume Calculator
Calculate volume of 3D shapes
Shipping Cost Calculator
Estimate shipping costs by weight and distance
Biweekly Pay Calculator
Calculate biweekly pay from annual salary
Take-Home Pay Calculator
Gross → net pay after federal, FICA and state tax
Mileage Reimbursement Calculator
Calculate mileage reimbursement at IRS rate
Ratio Simplifier
Simplify and work with ratios
GCD & LCM Calculator
Greatest common divisor and least common multiple
Prime Number Checker
Check if a number is prime and find factors
Rounding Calculator
Round numbers to a specified precision
Coin Flip Simulator
Simulate coin flips with statistics
Dice Roll Simulator
Roll dice and analyze the results
Date Add/Subtract
Add or subtract days from a date
Exact Age Calculator
Exact age in years, months, and days
Price Per Unit Calculator
Compare prices per unit to find the best deal
Random Team Generator
Split names into random teams
Password Entropy Calculator
Strength in bits from length and character pool
Speech Time Calculator
Speaking duration from word count and pace
QR Version Finder
Smallest QR version that fits your byte payload
Unix Timestamp Converter
Epoch seconds to readable UTC date