Tools & Calculators
Free online calculators and reference tools for everyday needs
BMI Calculator
Calculate Body Mass Index with WHO classification
Recipe Scaler
Scale recipe ingredients up or down
Pace Calculator
Running & cycling pace with split tables
Fuel Cost Calculator
Estimate trip fuel costs
Unit Price Comparator
Find the best value product
Time Zone Converter
50+ cities, DST-aware
Meeting Planner
Best meeting slot across every participant time zone, with CSV export
Percentage Calculator
Three-mode percentage calculations
Programmer Calculator
Dec/Hex/Bin/Oct with bitwise ops
Currency Converter
Live exchange rates for 170+ currencies
Password Generator
Secure, customizable password utility
IP Subnet Calculator
IPv4 subnetting and network info
Color Converter
HEX, RGB, HSL, CMYK, HSV & contrast checker
Scientific Notation
Convert between decimals and E-notation
Number Base
Binary, Hex, Decimal, Octal converter
Cooking Converter
Volume to weight by ingredient density
LCM & GCF Calculator
Least Common Multiple and Greatest Common Factor of any integers
Date Calculator
Add or subtract days, weeks, months, or years from any date
Date Difference
Days, weeks, months, and business days between two dates
Age Calculator
Exact age in years, months, and days plus next birthday
Business Days Calculator
Working days between dates, weekends excluded
Clothing Size Converter
US, UK, EU, Japan and S/M/L sizes for women, men and kids
Shoe Size Converter
US, UK, EU, Mondopoint and foot length in cm or inches
Concrete Calculator
Cubic yards, metres and bag counts for slabs, footings and columns
Paint Calculator
Gallons or litres needed per room, coats and openings
Lumber & Board Foot
Board feet, linear feet, cost and nominal vs actual sizes
Tile Calculator
Tiles and boxes needed including grout joints and waste
Gravel & Aggregate Calculator
Cubic yards, tons and cost for gravel, sand, topsoil and mulch
US Inflation Calculator
Dollar buying power between any two years, 1913 to today (BLS CPI-U)
Roman Numeral Converter
Numbers to Roman numerals and back, with validation
Number to Words
Spell out numbers in words, ordinals and cheque format
Height Converter
Centimeters to feet and inches with a full height chart
Physical Constants
Searchable library of 100+ constants
SI Prefixes
Yocto to yotta reference table
Periodic Table
Interactive chemical elements reference
Wire Gauge (AWG)
AWG to mm and inches conversion chart
Drill Bit Sizes
Fractional, metric, and wire gauge drill charts
Screen Resolutions
Standard display sizes and aspect ratios