Other Calculators
Everyday calculations made effortless. Find your exact age, split a restaurant bill, calculate your GPA, convert Roman numerals, or figure out your final exam score — all in seconds, with no sign-up required.
Taxes
View all →Income & Pay
View all →Budget & Spending
View all →Nutrition & Diet
View all →Exercise & Cardio
View all →Health & Life
View all →Core Math
View all →Stats & Numbers
View all →Roman Numeral Converter
Convert numbers to/from Roman numerals
Password Generator
Strong random passwords with entropy score
Color Converter
Convert between HEX, RGB, and HSL color codes
Number to Words Converter
Convert any number to English words
Hash Calculator
Generate MD5, SHA-1, SHA-256 & SHA-512 hashes from text
Base64 Calculator
Encode text to Base64 or decode it back (UTF-8 safe)
URL Encode Calculator
Percent-encode text for URLs or decode it back
IP Subnet Calculator
Network, broadcast, mask & usable hosts from CIDR
Date & Time
View all →Age Calculator
Exact age in years, months, days, and weeks
Date Calculator
Days between dates or add/subtract days
Time Calculator
Time difference, add hours, convert minutes
Military Time Converter
Convert between 12-hour and 24-hour time
Days Until Calculator
Countdown to any future or past date
Business Days Calculator
Working days between two dates, excluding weekends
Day of the Week Calculator
What day of the week any date falls on
Week Number Calculator
The ISO week number for any date
Time Zone Converter
Convert time between world time zones, DST-accurate
Home & DIY
View all →Paint Calculator
Gallons of paint needed for a room
Concrete Calculator
Cubic yards and bags for slabs, columns, footings
Gravel Calculator
Cubic yards and tons of gravel for any area
Roof Pitch Calculator
Pitch, angle, slope, and rafter length
Stair Calculator
Steps, riser height, tread depth & stringer length
Tile Calculator
Number of tiles and boxes needed for any room
Mulch Calculator
Cubic yards and bags of mulch for any bed
Roofing Calculator
Roof area, squares, and shingle bundles by pitch
Science & Weather
View all →Carbon Footprint Calculator
Estimate your annual CO₂ emissions in tons
Sunrise & Sunset Calculator
Sunrise, sunset, and day length for any location
Moon Phase Calculator
Moon phase, illumination, and next full moon
Wind Chill Calculator
How cold it really feels, via the official NWS formula
BTU Calculator
Cooling BTUs a room needs — AC sizing
Heat Index Calculator
How hot it really feels, from temperature and humidity
Dew Point Calculator
Dew point and comfort level from temp and humidity
Molarity Calculator
Molar concentration from mass, molar mass & volume
Density Calculator
Density from mass and volume in any units
Ohm’s Law Calculator
Solve volts, amps, ohms & watts from any two
Horsepower Calculator
HP from torque and RPM, with kW and PS
Fun & Lifestyle
View all →Other Categories
Frequently Asked Questions
How does the Age Calculator work?
Enter your date of birth and the calculator computes your exact age in years, months, and days, plus total days lived, total weeks, and your next birthday countdown.
How is GPA calculated?
GPA = Total grade points ÷ Total credit hours. Grade points are assigned per letter grade (A=4.0, B=3.0, etc.) and weighted by the credit hours for each course.
Can I calculate days between any two dates?
Yes. The Date Calculator supports any date range and also lets you add or subtract days from a date to find a future or past date.