Everyday calculators 82 tools
Date and time, construction and home, electricity, shopping and student calculators.
Date & time 17
- Date differenceYears, months and days between dates
- Days between datesCount days, weeks and weekdays
- Working daysBusiness days without weekends, holidays
- Add days to dateFind the date after or before N days
- Time durationHours between two times, even overnight
- Add or subtract timeAdd hours, minutes and seconds
- Hours calculatorTotal work hours from a timesheet
- Overtime calculatorOvertime hours and pay at 2× or 1.5×
- Days until a dateDays left until your exam or event
- Weeks between datesFull weeks and days between dates
- Birthday calculatorDays to your birthday and its weekday
- Leap year checkerCheck any year and see the next ones
- Day of the weekFind the weekday of any date
- Week numberISO week number of any date
- Time zone converterConvert IST to any time zone
- Unix timestampEpoch time to IST date and back
- Age calculatorExact age on any date
Construction & home 15
- Concrete calculatorCement bags, sand and aggregate
- Cement calculatorBags for any concrete or mortar volume
- Brick calculatorBricks, cement and sand for a wall
- Mortar calculatorCement and sand for any mortar mix
- Plaster calculatorCement and sand for 12, 15 or 20 mm
- Steel weight calculatorTMT bar weight in kg with D²/162
- Tile calculatorTiles and boxes for your room
- Paint calculatorLitres of paint for your room
- Flooring calculatorLaminate or vinyl boxes and cost
- Room area calculatorTotal area of several rooms
- Carpet area calculatorCarpet vs built-up vs super built-up
- Staircase calculatorRisers, treads, going and angle
- Water tank calculatorLitres in square or round tanks
- AC tonnage calculatorRight AC size for your room
- Roof pitch calculatorRoof angle, slope and rafter length
Electricity & energy 24
- Ohm's law calculatorFind V, I, R or P from any two
- Power calculatorWatts, kVA, HP and amps
- Electricity billBill from units, meter or appliances
- Appliance cost calculatorRunning cost of any appliance
- Battery backup calculatorHow long your inverter will run
- Battery capacity (Ah)Battery Ah for the backup you need
- Battery charging timeHours to recharge a battery
- Solar panel calculatorkW, panels and roof area from your bill
- Solar generationUnits and savings from your solar
- Inverter size calculatorRight inverter VA for your appliances
- Wire size calculatorCable size in sq mm for any load
- Voltage drop calculatorVoltage drop and loss in a cable
- Resistor colour codeRead 4, 5 and 6 band resistors
- LED resistor calculatorResistor value and wattage for LEDs
- Resistors series/parallelTotal resistance in series or parallel
- Capacitors series/parallelTotal capacitance in series or parallel
- Three-phase powerkW, kVA and amps for 415 V supply
- Power factor calculatorPower factor and capacitor kVAR
- Transformer calculatorTurns ratio and primary/secondary amps
- Frequency ↔ wavelengthWavelength from frequency and back
- Gear ratio calculatorGear ratio, output rpm and torque
- RPM calculatorPulley speed, belt length, cutting rpm
- Heat energy calculatorHeat energy and geyser heating time
- Hydraulic cylinder forcePush and pull force, speed
Daily life 18
- Tip calculatorTip, total and each person's share
- Split bill calculatorSplit a bill equally, with tip
- Unit price calculatorWhich pack size is the better buy
- Fuel cost calculatorPetrol, diesel or CNG cost of a trip
- Mileage calculatorYour real km/l from a full tank
- Trip cost calculatorRoad trip budget, split per person
- Water usage calculatorLitres your home uses each day
- Volumetric weightChargeable weight of a parcel
- Recipe scalingScale a recipe up or down
- Cups to grams converterCups and spoons to grams
- Speed distance timeFind speed, distance or time
- Work rate calculatorTime when A and B work together
- Pool volume calculatorLitres to fill a pool or tank
- Aquarium volumeLitres and weight of a fish tank
- 2-stroke fuel mix2T oil in ml for your petrol
- Dilution calculatorHow much stock and water to mix
- Concentration calculator% w/v, ppm and molarity of a solution
- Discount calculatorPrice after discount and your saving
Students 8
- Marks percentageTurn your marks into a percentage
- Grade calculatorMarks to CBSE or university grade
- GPA calculatorGPA from credits and letter grades
- SGPA calculatorSGPA from credits, CGPA from semesters
- Weighted averageAverage where some items count more
- Attendance calculatorClasses needed for 75% attendance
- Marks needed in finalMarks you need in the final exam
- CGPA to percentageCBSE or your own formula