Everyday Life Calculators
Choose a tool. Enter your values. Understand your result.
Age Calculator →
Calculate completed years of age, days since the last birthday and total days between birth and a reference date.
Date Calculator →
Count signed calendar days and weeks between a start date and an end date.
Unit Converter →
Convert compatible length, mass, temperature, volume and area units.
Time and Hours Calculator →
Calculate working hours between two times, including overnight shifts and unpaid breaks.
GPA Calculator →
Calculate a weighted GPA on a 4.0 scale from grade points and matching credit hours.
Password Generator →
Generate a random password with a chosen length and character groups, without saving a password history.
Hours Calculator →
Calculate working hours between two times.
Time Duration Calculator →
Calculate a same-day or overnight duration between times.
Day Counter →
Count signed calendar days between two dates.
Day of the Week Calculator →
Find the weekday for any valid calendar date.
Grade Calculator →
Calculate a weighted final grade.
Height Calculator →
Convert between centimetres and feet/inches.
Fuel Cost Calculator →
Estimate fuel quantity and cost for a trip.
Gas Mileage Calculator →
Calculate fuel economy from distance and fuel consumed.
Mileage Calculator →
Find distance travelled per unit of fuel.
Density Calculator →
Calculate mass per unit volume.
Mass Calculator →
Find mass from density and volume.
Weight Calculator →
Calculate gravitational force from mass and gravity.
Speed Calculator →
Find average speed from distance and elapsed time.
Ohm’s Law Calculator →
Calculate current and power from voltage and resistance.
Resistor Calculator →
Calculate equivalent series and parallel resistance.
Electricity Calculator →
Estimate energy use and cost from power and operating time.
Voltage Drop Calculator →
Estimate DC voltage drop using a conductor resistance you enter.
BTU Calculator →
Convert a thermal energy value from BTU to joules.
Horsepower Calculator →
Convert power in kilowatts to mechanical horsepower.
Engine Horsepower Calculator →
Estimate mechanical horsepower from engine torque and speed.
GDP Calculator →
Calculate nominal GDP using the expenditure approach.
Concrete Calculator →
Estimate material volume for a rectangular area.
Mulch Calculator →
Estimate material volume for a rectangular area.
Gravel Calculator →
Estimate material volume for a rectangular area.
Square Footage Calculator →
Calculate floor area from length and width.
Tile Calculator →
Estimate whole tiles required for an area.
Roofing Calculator →
Estimate sloped roof area from horizontal area and pitch.
Stair Calculator →
Estimate a whole number of risers and actual riser height.
Tire Size Calculator →
Calculate tyre diameter and circumference from the size markings.
Bandwidth Calculator →
Estimate ideal download time from file size and line speed.
Molarity Calculator →
Calculate molar concentration from solute mass, molar mass and solution volume.
Molecular Weight Calculator →
Sum atomic masses in a simple chemical formula.
Roman Numeral Converter →
Convert an integer into standard Roman numerals.
Base64 Encode / Decode →
Encode or decode text using a standard reversible encoding.
URL Encode / Decode →
Encode or decode text using a standard reversible encoding.
Dice Roller →
Roll one or more dice with secure random selection.
IP Subnet Calculator →
Find the network, broadcast and address counts for an IPv4 subnet.
Time Zone Calculator →
Convert a local date and time between IANA time zones.
Time Card Calculator →
Sum shift durations and subtract unpaid breaks.
Unit Price Calculator →
Compare the price per unit of two packages.
Battery Runtime Calculator →
Estimate runtime from battery capacity, voltage and power consumption.
Solar Energy Calculator →
Estimate daily panel energy from capacity and effective sunlight.
EV Charging Calculator →
Estimate charging time from battery capacity and charger power.
Data Storage Converter →
Convert decimal gigabytes into binary gibibytes and bytes.
Reading Time Calculator →
Estimate reading time from word count and reading speed.
Bra Size Calculator →
Estimate a US band and cup size from two measurements.
Shoe Size Conversion →
Compare approximate adult men’s US, UK and EU shoe sizes.
Sleep Calculator →
Estimate bedtimes using a chosen sleep duration and time to fall asleep.
Golf Handicap Calculator →
Average the lowest eight of twenty entered score differentials.
Love Calculator →
Generate a repeatable playful score from two names.
Wind Chill Calculator →
Estimate the cooling effect of wind using the NWS equation.
Heat Index Calculator →
Estimate apparent temperature from heat and humidity using the NWS method.
Dew Point Calculator →
Estimate dew-point temperature with a Magnus approximation.
Tools for dates, measurements and everyday planning
Use age for completed years on a chosen date, date difference for calendar days, and time or hours for shifts and breaks. GPA combines grade points with credit hours. The unit converter changes compatible measurements between supported units.
Battery runtime, solar energy, charging and construction tools use simplified models. Their results depend on the efficiency, measurements and other assumptions you supply. Check those assumptions before comparing a result with real equipment or a building specification.
A little help with the numbers
Smart input · AI explanations when connected