Other Daily Life & Practical Utility Calculators
Converters, dates and time, school grades, home projects, cars, science, and other everyday tools — browse by topic or search below.
65 calculators in this category
Showing all 65 calculators
School & Grades
Track GPA, grades, and the score needed on a final exam.
- GPA CalculatorCalculate your semester GPA from course credits and letter grades on the standard 4.0 scale, with optional 5.0/honors weighting and cumulative GPA.
- Grade CalculatorCalculate your current weighted course grade from assignment scores and category weights, with a letter-grade equivalent.
- Final Grade CalculatorCalculate the score you need on your final exam to reach your target overall course grade, given your current grade and the final's weight.
- Points-Based Grade CalculatorCalculate your overall grade from total points earned versus total points possible across all your graded assignments, tests, and quizzes.
Unit & Number Converters
Convert length, weight, area, volume, speed, temperature, and Roman numerals.
- Length ConverterConvert length between millimeters, centimeters, meters, kilometers, inches, feet, yards, and miles using exact conversion factors.
- Weight / Mass ConverterConvert mass between milligrams, grams, kilograms, metric tonnes, ounces, pounds, and stone using exact avoirdupois and metric conversion factors.
- Area ConverterConvert area between square millimeters, square centimeters, square meters, hectares, square kilometers, square inches, square feet, square yards, acres, and square miles using exact squared conversion factors.
- Volume ConverterConvert volume between milliliters, liters, cubic centimeters, cubic meters, US fluid ounces, US cups, US pints, US quarts, US gallons, cubic inches, and cubic feet using exact conversion factors.
- Speed ConverterConvert speed between meters per second, kilometers per hour, miles per hour, feet per second, and knots using exact conversion factors.
- Temperature ConverterConvert temperature between Celsius, Fahrenheit, and Kelvin using exact affine formulas, with absolute-zero validation.
- Roman Numeral ConverterConvert a decimal number (1-3999) to a canonical Roman numeral, or a canonical Roman numeral back to decimal.
Date & Time
Count days, find differences between dates, add durations, and total work hours.
- Date CalculatorAdd or subtract days from a date to find the resulting calendar date and day of the week.
- Date Difference CalculatorCalculate the exact number of days, weeks, and remaining days between two calendar dates.
- Age CalculatorCalculate exact age in years, months, and days between a date of birth and a reference date.
- Day CounterCount the calendar days or business days (Monday-Friday) between two dates.
- Day of the Week CalculatorFind the day of the week for any historical or future calendar date, plus whether its year is a leap year.
- Time CalculatorAdd or subtract two durations given in hours and minutes to get a normalized total.
- Time Duration CalculatorCalculate the duration between a start time and an end time in total minutes, decimal hours, and hours and minutes.
- Hours CalculatorCalculate elapsed hours between a start time and an end time in total minutes, decimal hours, and hours and minutes.
- Time Card CalculatorCalculate net worked hours for a shift from clock-in and clock-out times, minus an unpaid break.
- Time Zone CalculatorConvert a local date and time from one time zone to another, with date-aware daylight saving time handling and the UTC hour differential.
Home & Construction
Estimate materials and quantities for floors, roofs, concrete, gravel, mulch, tile, and stairs.
- Square Footage CalculatorCalculate square footage from a rectangular length and width, optionally totaled across multiple identical sections.
- Tile CalculatorCalculate how many tiles and boxes you need to order from floor dimensions, tile size, and a waste margin.
- Roofing CalculatorEstimate roof surface area, roofing squares, and asphalt shingle bundles from home dimensions and roof pitch.
- Concrete CalculatorCalculate how much concrete a rectangular slab needs in cubic feet, cubic yards, and cubic meters, plus the number of 60lb or 80lb bags required.
- Gravel CalculatorCalculate how much gravel you need in cubic yards and tons from driveway length, width, and depth.
- Mulch CalculatorCalculate how much mulch you need in cubic yards and standard 2 cu-ft bags from garden bed area and desired depth.
- Stair CalculatorEstimate stair riser count, riser height, tread depth, total run, and stringer length from total vertical rise, using IRC reference values.
- BTU CalculatorEstimate required heating and air conditioner BTU output rating from room square footage, ceiling height, and insulation quality.
Cars & Fuel
Estimate fuel cost, mileage, tire size, and engine horsepower.
- Fuel Cost CalculatorEstimate trip fuel consumption and cost from distance, fuel efficiency (mpg, km/L, or L/100km), and fuel price.
- Gas Mileage CalculatorCalculate vehicle fuel economy in Miles Per Gallon (MPG) from miles driven and US gallons of fuel consumed.
- Mileage CalculatorCalculate total business mileage from starting and ending odometer readings, and estimate the tax mileage deduction value at your per-mile rate.
- Tire Size CalculatorCompare two tire sizes (e.g. 225/45R17) to find the diameter difference and speedometer calibration error.
- Horsepower CalculatorCalculate mechanical horsepower from engine torque (lb-ft) and RPM using the standard HP = torque x RPM / 5252 formula.
- Engine Horsepower CalculatorEstimate engine horsepower from vehicle weight and quarter-mile elapsed time or trap speed using the classic drag racing performance formulas.
Physics & Chemistry
Solve for speed, force, mass, power, density, molarity, and molecular weight.
- Speed CalculatorCalculate speed from distance traveled and elapsed time, with results in meters per second, km/h, and mph.
- Acceleration CalculatorCalculate average acceleration from initial velocity, final velocity, and elapsed time, with a signed result in m/s².
- Force CalculatorCalculate force from mass and acceleration, with results in newtons.
- Momentum CalculatorCalculate linear momentum from mass and velocity, with a signed result in kg·m/s.
- Power CalculatorCalculate mechanical power from work/energy and elapsed time, with results in watts.
- Mass CalculatorCalculate mass from density and volume, with results in kilograms and grams.
- Weight CalculatorCalculate weight as gravitational force (F = m x g) from mass and a selected gravity — Earth, Moon, Mars, or custom.
- Density CalculatorCalculate density (mass per unit volume) in kg/m3 and g/cm3 from a mass and a volume.
- Molarity CalculatorCalculate molar concentration (mol/L) from mass of solute, molecular weight, and solution volume.
- Molecular Weight CalculatorCalculate the molecular mass (g/mol) and elemental percentage composition of chemical formulas using official IUPAC standard atomic weights.
Electrical
Calculate resistance, voltage, current, power use, and voltage drop.
- Ohm's Law CalculatorSolve for voltage, current, resistance, or power in a DC circuit given any two known electrical values, using Ohm's law and the power law.
- Resistor CalculatorDecode a resistor's 4-band, 5-band, or 6-band color code into its resistance in ohms and tolerance percentage.
- Electricity CalculatorEstimate monthly and annual electricity cost for an appliance from its wattage, daily usage hours, and electricity rate per kWh.
- Voltage Drop CalculatorEstimate voltage dropped over a conductor run and percentage voltage loss from wire gauge (AWG), material, supply voltage, distance, and current.
Weather
Estimate how cold or hot it feels, and the dew point.
- Wind Chill CalculatorCalculate the official National Weather Service wind chill temperature from air temperature and sustained wind speed.
- Heat Index CalculatorCalculate the official NOAA/NWS Heat Index ("feels like" temperature) from air temperature and relative humidity.
- Dew Point CalculatorCalculate the exact dew point temperature from air temperature and relative humidity using the Magnus-Tetens formula.
Computing & Security
Encode data, plan subnets, estimate bandwidth, and generate passwords.
- IP Subnet CalculatorCalculate an IPv4 subnet's network address, broadcast address, subnet mask, and usable host range from an address and CIDR prefix.
- Bandwidth CalculatorEstimate theoretical file transfer time from a data size and transfer rate, using decimal SI units (KB, MB, GB, TB and Kbps, Mbps, Gbps).
- Base64 Encode/Decode CalculatorEncode text to Base64 or decode Base64 back to text, with correct UTF-8 handling for Unicode and emoji.
- URL Encode/Decode CalculatorEncode or decode a URL component (query value or path segment), with correct Unicode handling and clear rejection of malformed percent-encoding.
- Password GeneratorGenerate a cryptographically secure random password with your choice of length and character sets.
Clothing & Sizing
Convert shoe and bra sizes between international systems.
Tips & Economics
Split a tip, or estimate gross domestic product.
Lifestyle & Games
Sleep timing, golf handicap, dice rolls, and a lighthearted compatibility score.
- Sleep CalculatorFind the best bedtime for a target wake-up time, or the best wake-up time for a target bedtime, based on complete 90-minute sleep cycles.
- Golf Handicap CalculatorEstimate a World Handicap System (WHS) style Handicap Index from your recent adjusted gross scores, course ratings, and slope ratings.
- Dice RollerRoll any number of standard dice (d4, d6, d8, d10, d12, d20, d100) with a cryptographically secure random roll.
- Love CalculatorGet a fun, shareable compatibility percentage for two names. For entertainment purposes only.
Guides for this category
Plain-English explanations of the formulas behind these calculators.