🔧Other Calculators
Date, time, unit conversion, electrical, and building calculators. Explore our full inventory of 58 verified calculators organized by topic below.
⭐ Featured & Most Used
Age Calculator
Calculate your exact age in years, months, weeks, days, hours, and minutes from your birthdate.
Date Calculator
Add or subtract days, weeks, months, and years from any date. Find the difference between dates.
Time Calculator
Add or subtract time values in hours, minutes, and seconds. Convert between time formats.
GPA Calculator
Calculate your GPA for a semester or cumulative across multiple semesters.
Conversion Calculator
Convert between units of length, weight, temperature, area, volume, speed, and more.
Ohm's Law Calculator
Calculate voltage, current, resistance, and power using Ohm's Law (V=IR, P=VI).
Tip Calculator
Calculate tip amount and total bill per person for restaurants and services.
⏰Time, Date & Schedule Tools(10)
Elapsed time, work hours, timesheet calculations, date differences, exact age, and day counters.
Time Calculator
Add or subtract time values in hours, minutes, and seconds. Convert between time formats.
Hours Calculator
Calculate total hours worked between start and end times, including break deductions.
Time Card Calculator
Calculate total weekly work hours and pay from daily clock-in and clock-out times.
Time Duration Calculator
Calculate the duration between two times in hours, minutes, and seconds.
Date Calculator
Add or subtract days, weeks, months, and years from any date. Find the difference between dates.
Age Calculator
Calculate your exact age in years, months, weeks, days, hours, and minutes from your birthdate.
Time Zone Calculator
Convert time between world time zones and find the local time in any city.
Day Counter
Count the number of days until or since any date. Track important events and deadlines.
Day of the Week Calculator
Find out what day of the week any date falls on, past or future.
Sleep Calculator
Calculate the best bedtime or wake-up time based on 90-minute sleep cycles.
🔨Construction, DIY & Flooring Estimation(7)
Square footage, roofing material needs, tile layout, concrete volume, gravel, mulch, and staircase geometry.
Square Footage Calculator
Calculate the square footage of rooms and spaces in various shapes.
Roofing Calculator
Calculate roofing material (shingles) needed based on roof dimensions and pitch.
Tile Calculator
Calculate how many tiles needed to cover a floor or wall area with a waste allowance.
Concrete Calculator
Calculate cubic yards of concrete needed for slabs, footings, columns, and steps.
Mulch Calculator
Calculate how many cubic yards or bags of mulch needed to cover a garden area.
Gravel Calculator
Calculate how many tons or cubic yards of gravel, rock, or sand needed for a project.
Stair Calculator
Calculate riser height, run depth, and number of stairs for staircase construction.
⚡Automotive, Physics & Electrical Engineering(16)
Gas mileage (MPG), fuel trip costs, engine horsepower, Ohm's law, voltage drop, resistor codes, and physics formulas.
Gas Mileage Calculator
Calculate fuel efficiency (MPG or L/100km) from distance traveled and fuel consumed.
Fuel Cost Calculator
Calculate trip fuel cost based on distance, fuel efficiency, and fuel price.
Mileage Calculator
Calculate mileage reimbursement or track total distance traveled for expense reports.
Speed Calculator
Calculate speed, distance, or time using the formula Speed = Distance / Time.
Horsepower Calculator
Convert between horsepower, kilowatts, and other power units.
Engine Horsepower Calculator
Estimate engine horsepower from trap speed (quarter mile) or elapsed time.
Density Calculator
Calculate density, mass, or volume using the density formula D = M/V.
Mass Calculator
Convert mass and weight between kilograms, pounds, ounces, grams, and more.
Weight Calculator
Calculate weight on different planets or convert weight between measurement systems.
Voltage Drop Calculator
Calculate voltage drop across a wire run based on current, resistance, and conductor length.
Ohm's Law Calculator
Calculate voltage, current, resistance, and power using Ohm's Law (V=IR, P=VI).
Electricity Calculator
Calculate electricity cost from power consumption, usage hours, and electricity rate.
Resistor Calculator
Decode resistor color bands and calculate total resistance for series and parallel circuits.
Tire Size Calculator
Calculate and compare tire dimensions: diameter, circumference, sidewall height, and revolutions per mile.
BTU Calculator
Calculate the BTU cooling or heating capacity needed for a room or space.
Luminance Calculator
Convert between luminance and illuminance units: lux, foot-candles, candela, nit.
🧪Chemistry & Environmental Science(5)
Solution molarity, molecular weight, half-life decay, wind chill index, heat index, and dew point.
Molarity Calculator
Calculate the molarity of a solution from moles, mass, and volume.
Molecular Weight Calculator
Calculate the molecular weight (molar mass) of a chemical formula.
Wind Chill Calculator
Calculate the apparent temperature (wind chill) from actual temperature and wind speed.
Heat Index Calculator
Calculate the heat index (feels-like temperature) from air temperature and humidity.
Dew Point Calculator
Calculate the dew point temperature from air temperature and relative humidity.
💡Education, Everyday & Web Utilities(20)
GPA calculations, grade targets, restaurant tips, numbers into words, unit conversions, and online utilities.
GPA Calculator
Calculate your GPA for a semester or cumulative across multiple semesters.
Grade Calculator
Calculate your course grade from assignment scores and weights. Find needed final exam score.
Tip Calculator
Calculate tip amount and total bill per person for restaurants and services.
Number to Words Converter
Convert any number to its English word representation (up to quintillions).
Roman Numeral Converter
Convert between Roman numerals and Arabic numbers (1 to 3,999,999).
Height Calculator
Predict a child's adult height or convert height between feet, inches, and centimeters.
Shoe Size Conversion
Convert shoe sizes between US, UK, EU, and CM measurements for men, women, and children.
Bra Size Calculator
Calculate bra size from band and cup measurements in US, UK, and EU sizing.
Conversion Calculator
Convert between units of length, weight, temperature, area, volume, speed, and more.
Stone to Pounds Converter
Convert stone and pounds to kilograms and pounds. Common in UK weight measurement.
Kilograms to Pounds Converter
Convert between kilograms and pounds, with a full conversion table.
IP Subnet Calculator
Calculate network address, broadcast, usable range, and host count for IPv4 subnets.
Bandwidth Calculator
Calculate download/upload time based on file size and internet speed.
Base64 Encode / Decode
Encode or decode text and data using Base64 encoding with Unicode support.
URL Encode / Decode
Encode or decode URL components using percent-encoding (RFC 3986).
Password Generator
Generate cryptographically secure random passwords with customizable length and character sets.
Dice Roller
Roll one or multiple dice with 4, 6, 8, 10, 12, or 20 sides. View totals and individual results.
Love Calculator
A fun compatibility calculator based on name numerology — for entertainment only.
GDP Calculator
Calculate GDP using the expenditure, income, or production approach.
Golf Handicap Calculator
Calculate your World Handicap System (WHS) golf handicap index from recent scores.
📋 Complete A-Z Directory (58)
Browse every other calculators available on CalculatorDigital.
Age Calculator
Calculate your exact age in years, months, weeks, days, hours, and minutes from your birthdate.
Bandwidth Calculator
Calculate download/upload time based on file size and internet speed.
Base64 Encode / Decode
Encode or decode text and data using Base64 encoding with Unicode support.
Bra Size Calculator
Calculate bra size from band and cup measurements in US, UK, and EU sizing.
BTU Calculator
Calculate the BTU cooling or heating capacity needed for a room or space.
Concrete Calculator
Calculate cubic yards of concrete needed for slabs, footings, columns, and steps.
Conversion Calculator
Convert between units of length, weight, temperature, area, volume, speed, and more.
Date Calculator
Add or subtract days, weeks, months, and years from any date. Find the difference between dates.
Day Counter
Count the number of days until or since any date. Track important events and deadlines.
Day of the Week Calculator
Find out what day of the week any date falls on, past or future.
Density Calculator
Calculate density, mass, or volume using the density formula D = M/V.
Dew Point Calculator
Calculate the dew point temperature from air temperature and relative humidity.
Dice Roller
Roll one or multiple dice with 4, 6, 8, 10, 12, or 20 sides. View totals and individual results.
Electricity Calculator
Calculate electricity cost from power consumption, usage hours, and electricity rate.
Engine Horsepower Calculator
Estimate engine horsepower from trap speed (quarter mile) or elapsed time.
Fuel Cost Calculator
Calculate trip fuel cost based on distance, fuel efficiency, and fuel price.
Gas Mileage Calculator
Calculate fuel efficiency (MPG or L/100km) from distance traveled and fuel consumed.
GDP Calculator
Calculate GDP using the expenditure, income, or production approach.
Golf Handicap Calculator
Calculate your World Handicap System (WHS) golf handicap index from recent scores.
GPA Calculator
Calculate your GPA for a semester or cumulative across multiple semesters.
Grade Calculator
Calculate your course grade from assignment scores and weights. Find needed final exam score.
Gravel Calculator
Calculate how many tons or cubic yards of gravel, rock, or sand needed for a project.
Heat Index Calculator
Calculate the heat index (feels-like temperature) from air temperature and humidity.
Height Calculator
Predict a child's adult height or convert height between feet, inches, and centimeters.
Horsepower Calculator
Convert between horsepower, kilowatts, and other power units.
Hours Calculator
Calculate total hours worked between start and end times, including break deductions.
IP Subnet Calculator
Calculate network address, broadcast, usable range, and host count for IPv4 subnets.
Kilograms to Pounds Converter
Convert between kilograms and pounds, with a full conversion table.
Love Calculator
A fun compatibility calculator based on name numerology — for entertainment only.
Luminance Calculator
Convert between luminance and illuminance units: lux, foot-candles, candela, nit.
Mass Calculator
Convert mass and weight between kilograms, pounds, ounces, grams, and more.
Mileage Calculator
Calculate mileage reimbursement or track total distance traveled for expense reports.
Molarity Calculator
Calculate the molarity of a solution from moles, mass, and volume.
Molecular Weight Calculator
Calculate the molecular weight (molar mass) of a chemical formula.
Mulch Calculator
Calculate how many cubic yards or bags of mulch needed to cover a garden area.
Number to Words Converter
Convert any number to its English word representation (up to quintillions).
Ohm's Law Calculator
Calculate voltage, current, resistance, and power using Ohm's Law (V=IR, P=VI).
Password Generator
Generate cryptographically secure random passwords with customizable length and character sets.
Resistor Calculator
Decode resistor color bands and calculate total resistance for series and parallel circuits.
Roman Numeral Converter
Convert between Roman numerals and Arabic numbers (1 to 3,999,999).
Roofing Calculator
Calculate roofing material (shingles) needed based on roof dimensions and pitch.
Shoe Size Conversion
Convert shoe sizes between US, UK, EU, and CM measurements for men, women, and children.
Sleep Calculator
Calculate the best bedtime or wake-up time based on 90-minute sleep cycles.
Speed Calculator
Calculate speed, distance, or time using the formula Speed = Distance / Time.
Square Footage Calculator
Calculate the square footage of rooms and spaces in various shapes.
Stair Calculator
Calculate riser height, run depth, and number of stairs for staircase construction.
Stone to Pounds Converter
Convert stone and pounds to kilograms and pounds. Common in UK weight measurement.
Tile Calculator
Calculate how many tiles needed to cover a floor or wall area with a waste allowance.
Time Calculator
Add or subtract time values in hours, minutes, and seconds. Convert between time formats.
Time Card Calculator
Calculate total weekly work hours and pay from daily clock-in and clock-out times.
Time Duration Calculator
Calculate the duration between two times in hours, minutes, and seconds.
Time Zone Calculator
Convert time between world time zones and find the local time in any city.
Tip Calculator
Calculate tip amount and total bill per person for restaurants and services.
Tire Size Calculator
Calculate and compare tire dimensions: diameter, circumference, sidewall height, and revolutions per mile.
URL Encode / Decode
Encode or decode URL components using percent-encoding (RFC 3986).
Voltage Drop Calculator
Calculate voltage drop across a wire run based on current, resistance, and conductor length.
Weight Calculator
Calculate weight on different planets or convert weight between measurement systems.
Wind Chill Calculator
Calculate the apparent temperature (wind chill) from actual temperature and wind speed.
Other Calculators FAQs
Are all calculators in this section free?
Yes, all 58 tools in this section are 100% free — no sign-up, no subscription, and no software to install.
Which time and date calculators are available?
This section includes a Time Calculator (add/subtract time), Hours Calculator (shift hours), Time Card Calculator, Date Calculator, Age Calculator, and Day Counter — all free and instant.
What unit conversion tools are available?
The unit conversion tools cover length, weight, volume, temperature, speed, area, data storage, energy, and more. There is also a Currency Calculator for foreign exchange conversion.