Other Tools & Calculators
Free everyday utility calculators for dates, time, education, construction, and more. Simple tools that make life easier.
66 free calculators organized by category
Find the Right Tool
With 66+ calculators on this page, here is a quick way to find what you need. Pick the scenario that matches your situation.
Home Improvement
Planning a build, renovation, or landscaping project? Figure out exactly how much material to order.
Tools: Concrete, Square Footage, Roofing, Tile, Gravel, Mulch, Stair, Cubic Feet & Yards
Date & Time
Count days between events, convert time zones, plan sleep schedules, or track work hours.
Tools: Age, Date, Time, Hours, Day Counter, Sleep, Time Zone
Electronics & Engineering
Size wires, calculate power draw, plan HVAC loads, or subnet a network.
Tools: Electricity, Ohm's Law, BTU, IP Subnet, Voltage Drop, Resistor, Bandwidth
Driving & Auto
Estimate trip fuel costs, compare tire sizes, or check engine performance numbers.
Tools: Fuel Cost, Gas Mileage, Mileage, Horsepower, Tire Size
School
Calculate your GPA, figure out what grade you need on a final, or estimate college expenses.
Tools: GPA, Grade, College Cost
Weather
Check how hot or cold it really feels outside, accounting for humidity and wind.
Tools: Heat Index, Wind Chill, Dew Point
Quick Conversions
Convert between measurement systems for length, weight, temperature, volume, and more.
Tools: Area, Length, Weight, Temperature, Volume, Speed, Pressure, Time, Data Storage
Fun & Random
Roll dice, flip coins, pick a random name, generate secure passwords, or let the tool decide for you.
Tools: Dice Roller, Coin Flip, Name Picker, Decision Maker, Password Generator
Frequently Asked Questions
Do these calculators work on my phone?
Yes. Every calculator is responsive and works on phones, tablets, and desktops. No app download is required—just open the page in any modern browser.
How accurate are the construction calculators?
The construction calculators (concrete, roofing, tile, gravel, mulch) use standard industry formulas. They give you solid estimates for ordering materials, though we always recommend adding 5–10% extra to account for waste and cuts.
Is my data saved or shared?
No. All calculations run entirely in your browser. Nothing you enter is sent to a server, stored, or shared with anyone. Close the tab and it’s gone.
Why are there so many different time calculators?
Each one solves a specific problem. The Hours Calculator is built for work timesheets. The Time Zone Calculator handles international scheduling. The Sleep Calculator optimizes wake/sleep times around 90-minute sleep cycles. Using a focused tool is faster than trying to make one generic calculator do everything.
Date & Time
Calculate dates, times, and durations
Age Calculator
Calculate exact age in years, months, and days between two dates.
Date Calculator
Add or subtract days, weeks, months, or years from any date.
Time Calculator
Add or subtract hours, minutes, and seconds. Convert between time formats.
Hours Calculator
Calculate total work hours and time between two times.
Time Card Calculator
Calculate total hours for timesheets and payroll.
Time Zone Calculator
Convert time between different time zones worldwide.
Time Duration Calculator
Calculate duration between two times or dates.
Day Counter
Count the number of days between two dates.
Day of Week Calculator
Find what day of the week any date falls on.
Sleep Calculator
Find the best time to sleep or wake up based on sleep cycles.
Pomodoro Timer
Boost productivity with the Pomodoro Technique. 25/5 focus timer with customizable sessions and break tracking.
Countdown to a Date
Count down to any date and time with live days, hours, minutes, and seconds. Shareable links and presets.
Education
Academic calculators for students
GPA Calculator
Calculate your GPA based on grades and credit hours. Supports different grading scales.
Grade Calculator
Calculate course grades and weighted averages for assignments.
College Cost Calculator
Estimate total college costs including tuition and expenses.
Construction
Calculate materials and measurements for building projects
Concrete Calculator
Calculate concrete needed for slabs, footings, columns, and stairs.
Square Footage Calculator
Calculate area for rooms, flooring, and construction projects.
Stair Calculator
Calculate stair dimensions including rise, run, and stringers.
Roofing Calculator
Calculate roofing materials needed for your project.
Tile Calculator
Calculate number of tiles needed for flooring or walls.
Mulch Calculator
Calculate mulch needed for landscaping projects.
Gravel Calculator
Calculate gravel or aggregate needed for projects.
Electronics
Electrical and network calculators
Voltage Drop Calculator
Calculate voltage drop for wire sizing and electrical projects.
Resistor Calculator
Calculate resistance values and color codes for resistors.
Ohms Law Calculator
Calculate voltage, current, resistance using Ohms Law (V=IR).
Electricity Calculator
Calculate electricity costs and energy consumption for appliances.
BTU Calculator
Calculate heating and cooling requirements in BTUs.
Bandwidth Calculator
Calculate network bandwidth requirements and speeds.
IP Subnet Calculator
Calculate IP address ranges and subnet masks.
Automotive
Vehicle-related calculators
Fuel Cost Calculator
Calculate fuel costs for trips based on distance and fuel prices.
Gas Mileage Calculator
Calculate fuel efficiency and MPG for vehicles.
Mileage Calculator
Calculate travel distance and mileage for trips.
Horsepower Calculator
Calculate engine horsepower and performance metrics.
Tire Size Calculator
Compare tire sizes and calculate speedometer differences.
Weather
Weather and temperature calculators
Wind Chill Calculator
Calculate apparent temperature based on wind speed and temperature.
Heat Index Calculator
Calculate heat index based on temperature and humidity.
Dew Point Calculator
Calculate dew point from temperature and humidity.
Science
Scientific calculators for physics and chemistry
Density Calculator
Calculate density from mass and volume.
Speed Calculator
Calculate speed, velocity, distance, or time.
Mass Calculator
Calculate mass from density and volume.
Molarity Calculator
Calculate molarity and solution concentrations.
Molecular Weight Calculator
Calculate molecular weight of chemical compounds.
Lifestyle
Everyday life calculators and tools
Tip Calculator
Calculate tips and split bills easily. Includes preset tip percentages.
Height Calculator
Convert height between feet/inches and centimeters.
Shoe Size Converter
Convert shoe sizes between US, UK, EU, and other systems.
Bra Size Calculator
Calculate proper bra size from measurements.
Password Generator
Generate secure random passwords with customizable settings.
QR Code Generator
Create custom QR codes for URLs, text, WiFi and more. Download as PNG or SVG.
Dice Roller
Roll virtual dice for games and random number generation.
Coin Flip
Flip a coin online — crypto-fair heads or tails with streaks, history, and batch flip stats.
Random Team Generator
Split any list of names into fair random teams. Balance by skill, copy or share the results.
Name Picker
Pick random winners from a list of names — giveaways, raffles and classrooms.
Bingo Card Generator
Print custom bingo cards for any event — unique cards with your own words.
Bingo Caller
Call bingo numbers automatically with tracking — perfect for game night.
Card Drawer
Draw random playing cards from a full 52-card deck.
Color Generator
Generate random colors with HEX, RGB and HSL values.
Decision Maker
Let randomness decide between your options when you cannot.
Lottery Number Generator
Generate random lottery numbers for Powerball, Mega Millions and more.
Quote Generator
Random famous quotes with authors — copy your favorites in one click.
Random Country Generator
Get a random country with flag, capital and population facts.
Random Letter Generator
Draw random letters A–Z for games, raffles and brainstorming.
Shuffle List
Randomize the order of any list — names, teams, tasks.
Golf Handicap Calculator
Calculate your golf handicap index from recent scores.
Writing & Puzzles
Quick writing and word-game tools
Online Notepad
Free autosaving notepad — write in your browser with word count, .txt download and print. No account.
Wordle Solver
Enter your guesses and tile colors, get every remaining possible answer ranked. Free and instant.
Wheel Spinner
Spin the wheel of names to pick a winner — custom entries, crypto-fair draw, spin history, and saved lists. Great for classrooms.
Simple Tools for Everyday Tasks
Save Time
Quick calculations without searching for formulas or downloading apps.
Accurate Results
Reliable calculations you can trust for important decisions.
Always Available
Works on any device with a web browser. No installation needed.