Everyday calculators
Age, dates, tips, discounts and units. The small sums you do weekly.
Age CalculatorExact age in years, months and days on any date.
Date DifferenceDays, weeks and working days between two dates.
Tip CalculatorTip amount, total bill and per-person split.
Discount CalculatorSale price, savings and effective discount after tax.
Length ConverterConvert between 9 units with exact factors.
Weight ConverterConvert between 7 units with exact factors.
Area ConverterConvert between 8 units with exact factors.
Volume ConverterConvert between 10 units with exact factors.
Speed ConverterConvert between 5 units with exact factors.
Time ConverterConvert between 7 units with exact factors.
Data Storage ConverterConvert between 6 units with exact factors.
Pressure ConverterConvert between 6 units with exact factors.
Energy ConverterConvert between 7 units with exact factors.
Power ConverterConvert between 5 units with exact factors.
Angle ConverterConvert between 5 units with exact factors.
Fuel Economy ConverterConvert between 3 units with exact factors.
Date Add / SubtractAdd days, weeks or months to a date.
Days UntilDays remaining until a date.
Unit PriceWhich pack is actually cheaper per unit.
Fuel CostTrip fuel and cost from distance and mileage.
Electricity CostMonthly bill from appliance wattage and hours.
GPA CalculatorWeighted GPA from up to four courses.
Grade NeededScore required on the final to hit a target grade.
Test ScorePercentage, grade letter and marks lost.
CountdownWeeks, days and hours to an event.
CM to InchesConvert cm to inches.
Inches to CMConvert inches to cm.
Meters to FeetConvert m to ft.
Feet to MetersConvert ft to m.
KM to MilesConvert km to mi.
Miles to KMConvert mi to km.
MM to InchesConvert mm to in.
Inches to MMConvert in to mm.
Yards to MetersConvert yd to m.
KG to LBSConvert kg to lb.
LBS to KGConvert lb to kg.
Grams to OuncesConvert g to oz.
Ounces to GramsConvert oz to g.
Stone to KGConvert st to kg.
Liters to GallonsConvert L to gal.
Gallons to LitersConvert gal to L.
ML to OZConvert mL to fl oz.
OZ to MLConvert fl oz to mL.
KM/H to MPHConvert km/h to mph.
MPH to KM/HConvert mph to km/h.
MB to GBConvert MB to GB.
GB to MBConvert GB to MB.
PSI to BarConvert psi to bar.
Bar to PSIConvert bar to psi.
Kcal to KJConvert kcal to kJ.
KW to HPConvert kW to hp.
Feet to InchesConvert ft to in.
Inches to FeetConvert in to ft.
Acres to Sq FtConvert ac to sqft.
Sq Ft to Sq MConvert sqft to sqm.
Sq M to Sq FtConvert sqm to sqft.
Knots to KM/HConvert kn to km/h.
HP to KWConvert hp to kW.
Joules to CaloriesConvert J to cal.
Days to HoursConvert d to h.
Hours to MinutesConvert h to min.
Weeks to DaysConvert wk to d.
Years to DaysConvert yr to d.
Hours WorkedHours and pay from clock times.
Time DurationHours and minutes between two times.
Bedtime CalculatorWhen to sleep for a wake time (90-min cycles).
Cooking ConversionCups to ml, tbsp and oz.
Oven TemperatureCelsius, Fahrenheit and gas mark.
Week NumberISO week number for a date.
Business DaysWorking days between two dates.
Zodiac SignStar sign from a birth date.
Days Between DatesSimple day count between two dates.
Password StrengthEntropy estimate for a password length.