47 tools
Quick Tools
Coin flips, dice rollers, random pickers, password generators, and other instant utilities.
Random Number Generator
Generate random numbers between any minimum and maximum instantly. Create a single number or a list using the Web Crypto API.
Open tool →Coin Flip — Heads or Tails
Flip a virtual coin online. Get an instant heads or tails result and track the streak across multiple flips.
Open tool →Dice Roller — D4 to D20
Roll standard RPG dice online: D4, D6, D8, D10, D12, and D20. Roll multiple dice and see each result and the total.
Open tool →Random Name Picker
Paste a list of names and pick one at random. Useful for classroom draws, team assignments, giveaways, and fair selections.
Open tool →Password Generator
Generate strong random passwords with custom length and character sets. Passwords are created locally and never transmitted.
Open tool →Yes or No — Random Decision Maker
Get an instant cryptographically random yes or no answer when you need a neutral 50/50 decision.
Open tool →Days Until Christmas
See how many days, hours, minutes, and seconds remain until Christmas with a live countdown.
Open tool →Days Until New Year
See how many days, hours, minutes, and seconds remain until New Year with a live countdown.
Open tool →Fuel Cost Calculator
Estimate trip fuel cost from distance, fuel economy, and local fuel price in miles/gallons or km/liters.
Open tool →Time Zone Calculator
Convert a clock time between two UTC offsets for travel planning and remote meeting scheduling.
Open tool →Roman Numeral Converter
Convert numbers to roman numerals and roman numerals back to decimal values from I through MMMCMXCIX.
Open tool →Gas Mileage Calculator
Calculate miles per gallon and liters per 100 km from distance traveled and fuel used.
Open tool →Grade Calculator
Calculate a weighted course grade and letter grade from scores and category weights.
Open tool →Hours Calculator
Calculate hours and minutes between two clock times, including overnight spans.
Open tool →Concrete Calculator
Calculate concrete volume in cubic feet and cubic yards for a rectangular slab from length, width, and depth.
Open tool →Date Calculator
Add or subtract days from a start date and see the resulting calendar date.
Open tool →IP Subnet Calculator
Calculate network address, broadcast address, subnet mask, and usable host count from an IPv4 CIDR block.
Open tool →Ohm's Law Calculator
Calculate voltage, current, resistance, or power when any two electrical values are known.
Open tool →Time Calculator
Calculate the duration between two date and time values in hours and minutes.
Open tool →Square Footage Calculator
Calculate room or floor area in square feet from length and width dimensions.
Open tool →Day of Week Calculator
Find the day of the week for any calendar date instantly.
Open tool →Bandwidth Calculator
Estimate download time from file size in megabytes and connection speed in megabits per second.
Open tool →Density Calculator
Calculate density in kilograms per liter from mass and volume.
Open tool →Speed Calculator
Convert speed between kilometers per hour and miles per hour.
Open tool →Horsepower Calculator
Convert electrical watts to mechanical horsepower using the standard 745.7 W per hp conversion.
Open tool →Sleep Calculator
Find recommended wake times based on bedtime and 90-minute sleep cycles for better rest.
Open tool →Wind Chill Calculator
Calculate wind chill temperature in Fahrenheit from air temperature and wind speed.
Open tool →Roofing Calculator
Estimate roofing squares and shingle bundles needed from roof area and waste allowance.
Open tool →Tile Calculator
Calculate how many floor or wall tiles are needed from room area, tile size, and waste percentage.
Open tool →Mulch Calculator
Calculate mulch volume in cubic feet and cubic yards from bed length, width, and depth.
Open tool →Gravel Calculator
Estimate gravel volume in cubic feet and cubic yards for driveways, paths, and landscaping beds.
Open tool →Stair Calculator
Calculate the number of stair steps, riser height, and total run from total rise and target riser size.
Open tool →Heat Index Calculator
Calculate the heat index from air temperature and relative humidity in Fahrenheit or Celsius.
Open tool →Dew Point Calculator
Calculate dew point temperature from air temperature and relative humidity in Fahrenheit or Celsius.
Open tool →BTU Calculator
Estimate recommended BTU heating or cooling capacity from room square footage and climate factor.
Open tool →Resistor Calculator
Decode resistor resistance in ohms from standard three-band color codes.
Open tool →Tire Size Calculator
Compare overall tire diameters between two metric tire sizes and see the difference in inches.
Open tool →Golf Handicap Calculator
Calculate a golf handicap index from score differentials using a simplified WHS-style average and show the selected differentials.
Open tool →Shoe Size Converter
Convert shoe sizes between US, UK, and EU sizing for men and women.
Open tool →Time Card Calculator
Total daily or weekly work hours from multiple time card entries in hours and minutes.
Open tool →Mileage Calculator
Calculate trip fuel cost from distance and fuel economy in miles/gallons or kilometers/liters.
Open tool →Molarity Calculator
Calculate molarity in moles per liter from solute moles and solution volume.
Open tool →Molecular Weight Calculator
Calculate molecular weight in g/mol from a chemical formula such as H2O or CO2.
Open tool →Mass Calculator
Convert mass between milligrams, grams, kilograms, ounces, and pounds.
Open tool →Voltage Drop Calculator
Estimate wire voltage drop and percentage from current, wire length, gauge, and system voltage.
Open tool →Love Calculator
Get a fun compatibility percentage and message from two names — for entertainment only.
Open tool →Bra Size Calculator
Estimate bra band and cup size from band and bust measurements in inches.
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