Other Calculators
Find free age, date, time, construction, electrical, fuel, password, and everyday calculators with fast results and practical examples.
Physical and digital unit conversions
Convert mass, length, area, volume, power, speed, time and digital units with explicit definitions, mixed measurements and reference tables.
- Mass and Weight ConverterConvert kilograms, pounds, ounces, stone and metric or troy weights. Enter mixed stone/pounds or pounds/ounces and compare all supported mass units.
- Length and Height ConverterConvert meters, centimeters, feet, inches and distance units. Enter feet and inches together, see mixed height results, and compare unit conversion tables.
- Area ConverterConvert acres, hectares, cents, square feet, square meters and other area units. Compare land and floor measurements with exact factors and conversion tables.
- Liquid Volume ConverterConvert liters, milliliters, cubic feet, US gallons and imperial gallons. Compare clearly labeled fluid ounces, pints, quarts and cups in both directions.
- Power ConverterConvert watts, kilowatts, mechanical and metric horsepower, Btu per hour and refrigeration tons. Compare power ratings with explicit definitions and tables.
- Speed ConverterConvert mph, km/h, meters per second, feet per second and knots. Compare speed units in both directions with clear conversion factors and reference tables.
- Time Unit ConverterConvert seconds, milliseconds, minutes, hours, days and weeks. Compare fixed-duration years with explicit definitions and see equivalent time-unit tables.
- Temperature ConverterConvert Celsius, Fahrenheit, kelvin, Rankine and Réaumur readings or temperature differences. Includes absolute-zero validation, formulas and reference tables.
- Torque ConverterConvert torque between newton meters, foot-pounds, inch-pounds, and kilogram-force units. Get both directions, an equivalence table, and worked torque examples.
- Acceleration ConverterConvert acceleration between standard gravity, meters per second squared, feet per second squared, Gal, and mph per second with formulas and reference tables.
- Energy ConverterConvert joules, kilojoules, kilowatt-hours, food Calories, small calories, BTU, and electronvolts. Compare energy units with clear definitions and worked examples.
- Pressure ConverterConvert pressure between psi, bar, pascals, kPa, atmospheres, Torr, and mercury units. Includes conversion tables and explanations of gauge and absolute pressure.
- Data Storage ConverterConvert bits and bytes with explicit decimal and binary prefixes, from kB and KiB through EB and EiB. Compare GB versus GiB and view a complete conversion table.
- Data Transfer Rate ConverterConvert Mbps, MB/s, Gbps, and binary transfer rates, or estimate download time from file size, connection speed, and usable throughput. Includes bit and byte guidance.
- Hertz to Seconds ConverterConvert frequency in Hz, kHz, MHz, or GHz to seconds per cycle and back. Compare periods in milliseconds, microseconds, and nanoseconds, or time multiple cycles.
Cooking, baking, and ingredient measurements
Convert recipe weights and volumes with ingredient assumptions, choose regional cup and spoon sizes, or estimate air-fryer starting settings.
- Cooking Measurement ConverterConvert recipe cups, grams, ounces, spoons, and liquid measures. Choose the ingredient and regional unit, scale a recipe, or enter a custom density.
- Cups to Grams ConverterConvert cups to grams or grams to cups for flour, sugar, butter, and other ingredients. Choose US, metric, 240 mL, or imperial cups and see the measurement assumptions.
- Grams to mL ConverterConvert grams to milliliters or mL to grams using an ingredient or your own density. See why equal volumes of water, flour, oil, and honey have different weights.
- Grams to Tablespoons ConverterConvert grams to tablespoons and tablespoons to grams by ingredient. Compare US, metric 15 mL, and Australian 20 mL spoons with worked cooking examples.
- Grams to Teaspoons ConverterConvert grams to teaspoons and teaspoons to grams for baking powder, salt, sugar, and other ingredients. Choose US or metric spoons and review the density used.
- Cups to Pounds ConverterConvert cups to pounds or pounds to cups using the ingredient and cup size. Compare flour, sugar, and butter by weight, with scaled recipe quantities and reference tables.
- Butter ConverterConvert butter sticks, cups, tablespoons, grams, ounces, and pounds. Distinguish full and half-size US sticks, scale a recipe, and compare all equivalents.
- Oven to Air Fryer ConverterEstimate air fryer temperature and cooking time from an oven recipe in Fahrenheit or Celsius. Review the adjustment rule or enter your appliance's own reductions.
Dates, time intervals, and work hours
Add durations, find the time between two events, or total shifts with breaks. Use the time-zone tool when local clock changes matter.
- Time CalculatorAdd or subtract time in days, hours, minutes, and seconds — between two time values, from a starting date and time, or from a free-text time expression.
- Time Duration CalculatorCalculate hours, minutes, and seconds between two clock times or the full duration between times on different dates.
- Hours CalculatorFind hours and minutes between two clock times or two dates — clock in and clock out, including overnight shifts.
- Time Card CalculatorCalculate weekly work hours, break deductions, time rounding, daily or weekly overtime, and optional base and overtime pay.
- Date CalculatorCount down to an event, find days between dates, or add and subtract calendar and business days. Includes custom weekdays and quick dates from today.
- Age CalculatorCalculate age or the interval between two dates in years, months, and days — and as total months, weeks, days, hours, minutes, and seconds.
- Generation CalculatorFind your generation by birth year, compare US and McCrindle ranges, and see a generation chart with ages reached this year.
- Age Difference CalculatorCompare two birthdates, birth years, or ages. Find the age gap in calendar years, months, and days, identify who is older, and see each person's current age.
- Day of the Week CalculatorFind the weekday for any date, its position in the year, remaining days and matching weekdays, and a calendar of that month.
- Time Zone CalculatorConvert fixed UTC offsets or plan a dated meeting across named IANA time zones with daylight-saving rules.
Home projects and material quantities
Start with area or volume, then estimate materials, waste, and packages for the job. Measurements and product coverage still need checking.
- CBM CalculatorCalculate cargo volume in CBM, cubic feet and liters for one box size or multiple package groups. Compare gross and dimensional weight and volume-only loads.
- Flooring CalculatorEstimate flooring area, waste allowance, whole boxes and material costs from room dimensions or a known area. Include multiple rooms, exclusions and labor.
- Square Footage CalculatorFind the square footage of a rectangle, circle, triangle, trapezoid, sector, or parallelogram — plus borders and rings — and optionally price the area.
- Area CalculatorFind the area of a rectangle, triangle, trapezoid, circle, sector, ellipse, or parallelogram. Mixed length units print a square result in each unit.
- Volume CalculatorFind the volume of a sphere, cone, cube, cylinder, tank, capsule, spherical cap, frustum, ellipsoid, pyramid, or tube. Mixed length units print a cubic result in each unit.
- Weight to Volume ConverterConvert material weight to volume or volume to weight using water, bulk-material examples or a custom density. Includes gallons, pounds, liters, cubic yards and tons.
- Density CalculatorCalculate density, mass, or volume from the other two measurements. Mix metric and imperial units, including kilograms, pounds, liters, cubic feet, and US gallons.
- Cubic Yard CalculatorCalculate cubic yards from area and depth, or find coverage and depth from available material. Estimate waste, weight, bags, truck loads and cost.
- Concrete CalculatorEstimate concrete volume, weight, and 60/80 lb bags for slabs, walls, holes, columns, tubes, curbs, and stairs.
- Gravel CalculatorEstimate gravel volume and weight to cover an area, plus optional material cost by the cubic yard, ton, or bag.
- Mulch CalculatorEstimate mulch volume to cover a garden or bed at a chosen depth, plus optional cost per cubic yard or bag.
- Asphalt CalculatorEstimate asphalt volume and tonnage for rectangular, circular, or known-area paving projects, including density, waste, truck loads, and material cost.
- Board Foot CalculatorCalculate board feet for one board or a complete lumber list in US or metric dimensions, including waste allowance and cost.
- Roofing CalculatorEstimate roof area from house footprint, pitch, and eaves, plus shingles, roll roofing, felt, and optional material cost.
- Tile CalculatorEstimate how many tiles you need to cover a floor, wall, or roof, including grout gap or overlap, boxes, and optional material cost.
- Stair CalculatorCalculate stair rise, run, step count, angle, stringer dimensions, tread adjustments, and headroom for basic or comprehensive layouts.
- Paint CalculatorEstimate wall and ceiling area, paint and primer volume, rounded container quantities, and entered material cost for one or more rooms.
- Fence CalculatorEstimate posts, panels or pickets, rails, concrete bags, accessories, and cost for connected fence runs and gates.
- Paver Patio CalculatorPlan pavers, packages, compacted base, bedding sand, weight, and material cost for a patio or walkway.
Heating, energy use, and electrical calculations
Estimate heating or cooling needs, electricity costs, and basic circuit quantities. These tools do not replace equipment specifications or installation design.
- Amps to Watts CalculatorConvert amps to watts or watts to amps for DC, single-phase and balanced three-phase AC. Include voltage, power factor and line-to-line or neutral voltage.
- LED Savings CalculatorCompare existing bulbs with LEDs to estimate annual electricity savings, upfront cost, payback, and net savings over time. Optionally apply your own emissions factor.
- Lumens to Watts CalculatorCalculate watts from lumens, lumens from watts, or a lamp's luminous efficacy. Use a product's actual rating and compare light output at your chosen efficiency.
- BTU CalculatorEstimate the BTUs needed to cool a room or house, or to heat or cool a space by a given temperature change, from size, insulation, and climate.
- Electricity CalculatorEstimate an appliance's electricity use and cost per day, week, month, and year from its power, duty cycle, usage, and electricity price.
- Ohm's Law CalculatorEnter any two of voltage, current, resistance, and power to solve the complete electrical circuit using Ohm's law.
- Resistor CalculatorDecode 3–6 band resistor color codes, combine resistors in series or parallel, and calculate round-wire conductor resistance.
- Voltage Drop CalculatorCalculate voltage drop for NEC wire data, estimated AWG resistance, or custom wire impedance in DC, single-phase AC, and three-phase AC circuits.
Trips, fuel, and vehicle measurements
Plan a trip budget, calculate measured fuel economy, or compare tire dimensions and power units.
- Fuel Economy ConverterConvert US or imperial mpg, liters per 100 km and kilometers per liter. Compare fuel economy and consumption with reciprocal formulas and reference tables.
- Miles per kWh CalculatorMeasure EV efficiency from a trip, convert miles per kWh and energy-consumption units, or estimate battery range with a reserve. Distinguish grid and battery energy.
- MPGe CalculatorConvert MPGe and EV efficiency units, or calculate a trip's gasoline-equivalent energy use from electricity and gasoline. Includes a transparent 33.7 kWh convention.
- Fuel Cost CalculatorEstimate the fuel a trip will use and what it will cost, from distance, fuel efficiency, and the pump price — in miles or kilometers, mpg, L/100 km, km/L, or liters per mile.
- Gas Mileage CalculatorCalculate MPG, km/L, L/100 km, distance traveled, fill expense, and fuel cost per distance from odometer readings.
- Distance CalculatorFind the distance between two points on a 2D plane or in 3D space, or the shortest (great-circle) distance between two latitudes and longitudes on Earth.
- Tire Size CalculatorCalculate tire diameter, sidewall, circumference, revolutions, alternative wheel sizes, or compare two tires and speedometer readings.
- Horsepower CalculatorCalculate power from force, distance, and time, or convert watts, kilowatts, horsepower, boiler horsepower, and BTU per hour.
Grades, shopping, and shared bills
Calculate weighted grades or GPA, compare discounts, and split a bill. Check the grading or pricing rules that apply to your situation.
- University Grade CalculatorCalculate university grades by assignment credits or year weightings, estimate honours bands, and find the average mark needed on remaining work to reach your target.
- Grade CalculatorFind a weighted course grade from numbered or letter scores, and the grade you need on remaining work or the final exam.
- GPA CalculatorCalculate a credit-weighted GPA from letter, percentage, or point grades — plus the GPA you need on upcoming credits to hit a target.
- Discount CalculatorFind the sale price, amount saved, or original price from a percent-off or fixed-amount discount. Enter any two values to solve the rest.
- Tip CalculatorCalculate a tip and total for a bill at common percentages, or split the tip and total among a group.
Conversions, digital tools, and everyday estimates
Convert units or Roman numerals, work with network addresses, generate a password or dice roll, and explore sleep or dog-age estimates.
- Conversion CalculatorConvert length, temperature, area, volume, and weight between metric, US customary, and imperial units. See the result and the same amount in every unit of that category.
- Roman Numeral ConverterConvert Arabic numbers and Roman numerals in either direction, including dates, lists, and vinculum notation up to 3,999,999.
- IP Subnet CalculatorCalculate IPv4 and IPv6 networks, ranges, masks, host counts, identifiers, and address representations from an IP address and prefix.
- Password GeneratorGenerate a strong random password on this device. Nothing is sent to a server — length, character sets, entropy, and strength stay in your browser.
- Virtual Dice RollerRoll up to 100 conventional six-sided dice or simulate up to 10,000 dice with any number of sides.
- Sleep CalculatorExplore bedtime or wake-time scenarios using an editable cycle interval, or calculate from a chosen sleep length and fall-asleep time.
- Dog Age CalculatorConvert dog years to human years using a size-aware age chart, compare the UCSD epigenetic formula, and identify your dog's life stage.