Date, Time & Everyday Calculators

Handy tools for daily life: calculate your exact age, count days between dates, add hours and minutes, total a weekly time card, work out your GPA and the grade you need on a final, compare unit prices, estimate fuel and electricity costs, convert time zones and generate strong passwords.

Age CalculatorEnter a date of birth to get an exact age in years, months and days, plus your age in weeks,…Date CalculatorAdd or subtract years, months, weeks and days from a date — or count only business days — to…GPA CalculatorPick a letter grade and credit hours for each course to get your semester GPA on the 4.0…Day of the Week CalculatorFind which day of the week any date falls on — past or future — with the day of the year,…Days Between Dates CalculatorFind how many days, weeks and months lie between two dates — and how many of them are…Dice RollerRoll one or many virtual dice of any size, add a modifier, and see each die, the total, and…Electricity Cost CalculatorEnter an appliance’s wattage, how long you use it and your electricity rate to see its…Final Grade CalculatorEnter your current grade, the grade you want and how much the final exam is worth to see…Fuel Cost CalculatorEstimate how much fuel a trip will use and what it will cost — in kilometres and litres, US…Gas Mileage CalculatorMeasure your car’s real fuel economy from a fill-up, or convert any figure between US mpg,…Grade CalculatorEnter your score and weight for each category — homework, quizzes, projects, exams — to see…Hours CalculatorEnter start times, end times and unpaid breaks for each day to total your hours for the…Password GeneratorCreate strong random passwords instantly — choose the length and characters, and see how…Time CalculatorAdd or subtract two durations in days, hours, minutes and seconds and see the answer as…Time Zone ConverterConvert a date and time from one time zone to another, with daylight saving handled…Unit Price CalculatorCompare two or three products by price per kilogram, litre, ounce or item to see instantly…Week Number CalculatorFind the ISO week number of any date, the Monday-to-Sunday dates of that week, the US-style…Word CounterPaste or type your text to count words, characters, sentences and paragraphs instantly, with…

Frequently asked questions

Are the date, time & everyday calculators free?

Yes. All 18 date, time & everyday calculators on Calcivia are free to use with no sign-up, and they run privately in your browser.

How accurate are the results?

Each calculator uses standard, published formulas that are explained on its page, with a worked example. Results are estimates for planning — confirm important decisions with a qualified professional.

Can I save or share a calculation?

Yes. Every calculator updates its link as you type, so you can bookmark or share the exact inputs. You can also star favorites, copy results, download tables as CSV and print.

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