Everyday Calculators & Tools

Home-improvement estimators, date and time tools, vehicle and energy costs, random generators and quick utilities — all free and running in your browser. 99 tools, grouped by topic.

Reviewed by the CalcCafe editorial team · Last updated 1 July 2026 · How we test our tools

Construction & home improvement

Material quantities and costs for tile, concrete, gravel, roofing, fencing, paint and HVAC sizing.

Tile CalculatorCalculate how many tiles and boxes you need for any floor or wall area, including a waste allowance.
Square Footage CalculatorCalculate area from length and width in square feet and square meters, plus optional total cost from price…
Concrete CalculatorCalculate concrete for a slab from length, width and depth.
Gravel CalculatorEstimate how much gravel you need.
Mulch CalculatorCalculate how much mulch you need by area and depth.
Asphalt CalculatorEstimate asphalt tonnage and cost for a driveway.
Roofing CalculatorConvert your roof footprint and pitch into actual roof surface area and roofing squares, plus a…
Stair CalculatorCalculate stair steps, riser height, and run from your total rise.
Fence CalculatorEstimate the cost of a fence plus how many posts and sections you need.
Deck Calculator (Cost & Materials)Estimate what it costs to build a deck.
Paint CalculatorEstimate how many gallons of interior paint you need and what it will cost.
HVAC Load CalculatorEstimate the cooling load for a room or home in BTU/hr and tons.
BTU CalculatorCalculate the cooling BTU and AC tonnage needed for a room from its square footage, with ceiling height…
Heat Pump Savings CalculatorCompare the annual heating cost of a heat pump against a gas furnace.
Solar Payback CalculatorEstimate how many years your solar panels take to pay for themselves.
Pallet CalculatorWork out how many cartons fit on a pallet.
Container Loading CalculatorEstimate how many boxes or units fit in a shipping container.
Freight Cost CalculatorEstimate LTL freight shipping cost from weight, rate per pound, fuel surcharge and base charge.

Electricity & energy

Bills, Ohm's law, resistor codes, voltage drop, EV charging and carbon footprint.

Electricity Cost CalculatorCalculate the energy use and running cost of any appliance.
Ohms Law CalculatorFree Ohm's Law calculator.
Resistor Color Code CalculatorDecode a 4-band resistor color code instantly.
Voltage Drop CalculatorCalculate voltage drop in copper wire by AWG gauge, length and current.
EV Charging Cost CalculatorEstimate the cost to charge your electric car at home.
Carbon Footprint CalculatorEstimate your annual CO2 footprint from driving, home electricity, natural gas, and flights.
Horsepower CalculatorCalculate horsepower from torque and RPM, or reverse it to find torque.
Engine Horsepower CalculatorEstimate engine horsepower from quarter-mile trap speed and vehicle weight using the classic Hale/Fox…

Cars, fuel & travel

Fuel cost per trip, MPG, mileage reimbursement, tire sizing and road-trip budgets.

Fuel Cost CalculatorEstimate trip fuel cost and gallons used from distance, fuel efficiency (MPG), and price per gallon.
Gas Mileage CalculatorEnter miles driven and gallons used to get your MPG, L/100km, fuel cost per mile and cost per 100 miles.
Mileage Reimbursement CalculatorCalculate mileage reimbursement instantly: enter miles driven and the rate per mile to get your total…
Road Trip Cost CalculatorEstimate the total cost of a road trip — fuel, tolls, lodging and food — and split it per person.
Route Fuel Cost CalculatorEstimate the true cost of a delivery route from distance, MPG, fuel price, speed, driver wage and tolls.
Tire Size CalculatorDecode a tire size like 205/55R16 into sidewall height, overall diameter (inches and mm), and rolling…
Speed CalculatorFree speed calculator.

Dates, time & timers

Age, day counts, business days, anniversaries, hours worked and simple timers.

Age CalculatorFree age calculator.
Date CalculatorAdd or subtract days, weeks, and months from a date, or find the exact difference between two dates in…
Day CounterCount the number of days between two dates, with an option to include the end date and a breakdown of…
Day of the Week CalculatorFind what day of the week any date falls on, plus its day-of-year, week number, and leap year status.
Business Days CalculatorCount business days between two dates, excluding weekends and the public holidays you specify.
Anniversary CalculatorFind how many years since your wedding or milestone date, when the next anniversary falls, days until it,…
Leap Year CheckerCheck instantly whether any year is a leap year, see the days in February, and find the next and previous…
Time CalculatorAdd or subtract two durations in HH:MM:SS.
Time Duration CalculatorCalculate the exact duration between two dates and times.
Hours CalculatorCalculate hours worked between a start and end time, minus break minutes.
Time Card CalculatorFree time card calculator: enter clock-in and clock-out for 7 days to get daily and weekly hours, plus…
Time Zone ConverterConvert a time between any two UTC offsets (UTC-12 to UTC+14).
Sleep CalculatorFind the best bedtimes or wake-up times based on 90-minute sleep cycles, allowing ~15 minutes to fall asleep.
StopwatchFree online stopwatch with hundredth-of-a-second precision and lap times.
Digital ClockFree online digital clock showing your local time with seconds, 12/24-hour toggle, date and time zone.
Pomodoro TimerFree online Pomodoro timer with 25-minute focus sessions, short and long breaks, and adjustable intervals.

Weather & science

Dew point, heat index, wind chill, density, molarity and molecular weight.

Dew Point CalculatorCalculate the dew point from air temperature and relative humidity using the Magnus formula.
Heat Index CalculatorCalculate the heat index ("feels like" temperature) from air temperature in °F and relative humidity using…
Wind Chill CalculatorCalculate the wind chill "feels like" temperature from air temperature and wind speed using the official…
Density Calculator (ρ = m / V)Free density calculator.
Mass ConverterConvert mass and weight between mg, g, kg, oz, lb, and metric tons instantly.
Weight ConverterFree weight converter.
Molarity CalculatorCalculate molarity (mol/L) from moles and volume, or from mass, molar mass, and volume.
Molecular Weight CalculatorCalculate the molar mass of any chemical formula like C6H12O6 or Ca(OH)2.
Height ConverterConvert height between centimeters and feet/inches both ways.
GDP CalculatorCalculate GDP with the expenditure approach: Consumption + Investment + Government Spending + Net Exports…

Everyday life

Tips, grades, GPA, golf handicap, shoe and bra sizes.

Tip CalculatorFree tip calculator: enter your bill, tip percent, and number of people to instantly see the tip, total,…
GPA CalculatorFree GPA calculator.
Grade CalculatorFree grade calculator.
Golf Handicap CalculatorCalculate your golf handicap index from recent scores, course ratings, and slope ratings.
Shoe Size ConverterConvert shoe sizes between US, UK, and EU for men and women.
Bra Size CalculatorFind your bra size from band (underbust) and bust measurements in inches.
Love CalculatorFun love calculator: enter two names to get a deterministic compatibility percentage.
Length Conversion CalculatorConvert lengths between mm, cm, m, km, inches, feet, yards, and miles instantly with this free length unit…
Roman Numeral ConverterConvert integers (1-3999) to Roman numerals and Roman numerals back to numbers instantly.

Random generators & games

Pick names, teams, numbers and winners — plus a few games to pass the time.

Dice RollerRoll any number of dice with custom sides.
Coin FlipFree online coin flip.
Spin the WheelA spinning wheel of choices — add your options and let it decide.
Lucky Draw GeneratorRun a fair lucky draw / raffle — paste entries and pick random winners.
Random Team GeneratorSplit a list of names into random, balanced teams.
Random Letter GeneratorGenerate random letters A–Z instantly — pick how many.
Random Country GeneratorPick a random country from around the world — one or several at a time.
Random City GeneratorGenerate a random major world city — pick how many.
Random Animal GeneratorGet a random animal — one or many at a time.
Random Song GeneratorGenerate a random song pick to play or cover.
Random Movie GeneratorCan't decide what to watch?
Baby Name GeneratorDiscover random baby name ideas — generate a shortlist in one click.
Fantasy Name GeneratorGenerate fantasy character names for games, stories and D&D.
Business Name GeneratorBrainstorm catchy business and brand name ideas in one click.
Secret Santa GeneratorPair a group for Secret Santa — everyone gives a gift, nobody draws themselves.
Bingo Card GeneratorGenerate a random 75-ball bingo card with a free centre square.
Tambola Ticket GeneratorGenerate a valid Tambola / Housie ticket — 3×9 grid, 15 numbers, 1–90.
Tournament Bracket GeneratorSeed a single-elimination tournament bracket from a list of teams.
2048 GamePlay 2048 free in your browser — slide and merge numbered tiles to reach the 2048 tile.
Snake GamePlay the classic Snake game free in your browser.

Text, web & network utilities

Editors, encoders, passwords, subnets and bandwidth.

Online Notepad & Text EditorFree online notepad and text editor — write notes, count words & characters, Markdown formatting, multiple…
Markdown to MediumWrite or paste Markdown, preview it live, then copy it as rich text and paste straight into Medium with…
Password GeneratorGenerate strong, random passwords in your browser.
URL Decode & EncodeFree online URL encoder and decoder.
Base64 Decode & EncodeFree online Base64 encoder and decoder with full Unicode (emoji, accents) support.
Subnet Calculator (IP / CIDR)Enter an IPv4 address and CIDR prefix to get the network address, broadcast, subnet mask, usable host…
Bandwidth CalculatorCalculate file download and upload time from file size and connection speed.
Hindi Font Converter (KrutiDev ⇄ Unicode)Convert KrutiDev 010 text to Unicode Hindi and back instantly.

India-specific tools

PAN validation, Aadhaar masking and UPI QR codes.

PAN Card Validator & FormatterCheck the format of an Indian PAN, decode the holder type from its fourth letter and clean up spacing —…
Aadhaar Masking ToolMask an Aadhaar number to the UIDAI-recommended XXXX XXXX 1234 format and check it with the Verhoeff…
UPI QR Code GeneratorGenerate a scannable UPI payment QR from any UPI ID, with optional fixed amount and note.

Sources & references

These tools follow our methodology and provide educational estimates only — verify important figures with a qualified professional.