Age Calculator Calculate age in years, months, days, and total days. Time Calculator Add or subtract hours and minutes from a time. Time Zone Calculator Convert time between UTC offsets. Day Counter Count days between two dates. Date Calculator Add or subtract days from a date. Hours Calculator Calculate elapsed hours between two times. Time Duration Calculator Find duration between two times. Day of the Week Calculator Find the day of week for a date.

GPA Calculator Calculate GPA from grade points and credits. Grade Calculator Calculate weighted grade from score and weight.

Height Calculator Convert height between centimeters, inches, and feet. Conversion Calculator Convert length, weight, temperature, and volume units. Shoe Size Conversion Convert approximate shoe sizes between US, UK, and EU. Bra Size Calculator Estimate bra band and cup size from measurements. Weight Calculator Convert weight between kilograms and pounds. Roman Numeral Converter Convert numbers to Roman numerals.

IP Subnet Calculator Calculate subnet mask, host count, and network size from CIDR. Password Generator Generate secure random passwords. Bandwidth Calculator Estimate file transfer time from size and bandwidth. URL Encode / Decode Encode or decode URL text. Base64 Encode / Decode Encode or decode Base64 text.

Voltage Drop Calculator Estimate voltage drop for a wire run. Ohms Law Calculator Calculate voltage, current, resistance, and power. Resistor Calculator Calculate resistor value from color bands. Electricity Calculator Estimate electricity cost from power, time, and rate.

Square Footage Calculator Calculate square footage from length and width. Stair Calculator Estimate stair rise, run, and step count. Tile Calculator Estimate number of tiles needed for an area. Gravel Calculator Estimate gravel volume and weight. Concrete Calculator Estimate concrete volume for a slab. Roofing Calculator Estimate roofing area and bundles. Mulch Calculator Estimate mulch volume from area and depth.

GDP Calculator Calculate GDP using the expenditure approach.

Horsepower Calculator Calculate horsepower from torque and RPM. Engine Horsepower Calculator Estimate engine horsepower from torque and RPM.

Mileage Calculator Calculate mileage rate reimbursement. Speed Calculator Calculate speed from distance and time. Fuel Cost Calculator Estimate trip fuel cost. Gas Mileage Calculator Calculate miles per gallon and fuel efficiency.

Mass Calculator Calculate mass from density and volume. Molecular Weight Calculator Estimate molecular weight from a simple chemical formula. Density Calculator Calculate density, mass, or volume. Molarity Calculator Calculate molarity from moles and volume.

Golf Handicap Calculator Estimate golf handicap differential.

Tire Size Calculator Calculate tire diameter and circumference from tire size.

Heat Index Calculator Calculate heat index from temperature and humidity. Wind Chill Calculator Calculate wind chill from temperature and wind speed. Dew Point Calculator Calculate dew point from temperature and humidity.

Dice Roller Roll dice with a selected number of sides.

BTU Calculator Estimate cooling BTU needs for a room.

Time Card Calculator Calculate work hours and pay.

Love Calculator Generate a playful compatibility score.

Tip Calculator Calculate tip, total bill, and split amount.

Sleep Calculator Estimate wake or bedtime using sleep cycles.