Everyday Calculators
Dates, time, grades, passwords and other everyday utility calculators.
Age Calculator
Calculate exact age in years, months and days from a birth date.
BBandwidth / Download Time Calculator
Calculate how long a file will take to download at a given connection speed.
7 min 9 secBBase64 Encode / Decode
Encode text to Base64, or decode a Base64 string back to text.
SGVsbG8sIHdvcmxkIQ==BBra Size Calculator
Estimate your bra size from band and bust measurements.
32DBBTU Calculator
Estimate the BTU heating/cooling capacity needed for a room.
7,500CConcrete Calculator
Calculate how much concrete (in cubic yards and bags) you need for a slab.
1.23 cubic yardsDDarts Scorer & Checkout Calculator
Play a live 501/301 game with running score, bust detection and checkout suggestions.
T20 → T20 → D-Bull (50)DDate Calculator
Find the number of days between two dates, or add/subtract time from a date.
DDay of the Week Calculator
Find out what day of the week any date falls on.
DDensity Calculator
Calculate density, mass or volume from the other two.
1,000 kg/m³DDew Point Calculator
Calculate the dew point from temperature and relative humidity.
57.7°F (14.3°C)DDice Roller
Roll any number of virtual dice with any number of sides.
3, 3EElectricity Cost Calculator
Calculate the running cost of an electrical appliance.
$21.6EEngine Horsepower Calculator (Trap Speed)
Estimate engine horsepower from vehicle weight and quarter-mile trap speed.
228 hpFFuel Cost Calculator
Calculate the fuel cost for a trip.
$37.5GGas Mileage Calculator
Calculate your car's fuel economy (MPG) from miles driven and gallons used.
27.83 MPGGGolf Handicap Calculator
Estimate your golf handicap index from recent round scores.
14.7GGPA Calculator
Calculate your weighted grade point average from course credits and grades.
3.485GGrade Calculator
Calculate a weighted final grade from assignment scores and weights.
91%GGravel Calculator
Calculate how much gravel you need in cubic yards and tons.
4.94 cubic yardsHHeat Index Calculator
Calculate the heat index (feels-like temperature in humid heat).
113.1°FHHeight Predictor Calculator
Predict a child's approximate adult height from parents' heights.
179 cm (70.5 in)HHorsepower Calculator
Calculate horsepower from torque and engine RPM.
300 hpHHours Calculator
Calculate hours worked and pay, including overtime, from clock-in and clock-out times.
8.5IIP Subnet Calculator
Calculate network address, broadcast address and host range from an IPv4 address and CIDR prefix.
192.168.1.0LLove Calculator
A just-for-fun compatibility score between two names.
71%MMileage Reimbursement Calculator
Calculate business mileage reimbursement.
$100.5MMolarity Calculator
Calculate molarity from moles (or mass) and solution volume.
0.5 mol/LMMolecular Weight Calculator
Calculate the molecular weight of a chemical formula.
180.156 g/molMMulch Calculator
Calculate how much mulch you need for a garden bed.
1.85 cubic yardsOOhm's Law Calculator
Solve for voltage, current or resistance using Ohm's Law.
12 VOOnline Abacus
A real click-to-count abacus for learning place value.
4527PPassword Generator
Generate a strong random password with your choice of character sets.
J$yjSEZ-aZgH6&n)PPatio Calculator
Calculate the pavers and base material needed for a patio.
212RRandom Number Generator
Generate one or more random numbers within a range.
95, 64, 55, 93, 10RResistor Color Code Calculator
Decode a 4-band resistor color code into its resistance value.
1 kΩRRing Size Converter
Convert between ring diameter, circumference and US ring size.
8RRoman Numeral Converter
Convert between numbers and Roman numerals.
MCMXCIVRRoofing Calculator
Calculate roofing squares and shingle bundles needed.
19.8SShoe Size Conversion
Convert a US men's shoe size to US women's, UK, EU and centimeters.
9SSleep Calculator
Find optimal bedtimes or wake times based on 90-minute sleep cycles.
23:15SSquare Footage Calculator
Calculate the square footage of a room and an optional material cost.
180 sq ftSStair Calculator
Calculate the number of steps, riser height and stringer length for a staircase.
15TTile Calculator
Calculate how many tiles you need for a floor or wall.
132TTime Calculator
Add or subtract two time durations (hours, minutes, seconds).
4h 15m 0sTTime Card Calculator
Add up a week's daily hours and calculate pay with overtime.
39.5TTime Duration Calculator
Calculate the duration between two clock times.
8h 30mTTime Zone Calculator
Convert a time from one UTC offset to another.
20:00TTire Size Calculator
Compare the overall diameter of two tire sizes.
+1.81%UURL Encode / Decode
Encode text for use in a URL, or decode a URL-encoded string.
hello%20world%20%26%20friendsVVoltage Drop Calculator
Calculate voltage drop across a wire run for a given gauge and load.
1.59 VWWind Chill Calculator
Calculate the wind chill (feels-like) temperature.
12.6°F