Dates and time
Days between dates, ages, working days, deadlines and hours worked. Instant results, no sign-up.
Date calculations
8 tools- Days between two dates calculator Enter two dates and we tell you how many days lie between them, broken down into weeks, spare days and hours.
- Difference between two dates in years, months and days Rather than counting loose days, this gives you the difference the way you would say it out loud: "2 years, 3 months and 5 days".
- Working days between two dates Count only the real working days between two dates: weekends come out, and public holidays too if you want them to.
- Add or subtract days from a date Give me a date and how many days to add or subtract. Count every day, or working days only.
- Exact age calculator Enter a date of birth and we work out the exact age in years, months and days, plus how long is left until the next birthday.
- Work hours calculator With your start time, finish time and break, we work out the effective day and what it adds up to over a week, a month and a year.
- Week number of the year Which week of the year a date falls in, under ISO 8601, which is the standard businesses use and does not always match what you would guess.
- What day of the week a date falls on What day you were born on, what day your birthday falls on, when a deadline lands. With the week number and the days between it and today.
Other categories
- Money Compound interest, loans, mortgages and savings goals, with a breakdown of where every figure comes from and a chart of how it evolves.
- Home and energy What your appliances cost to run, what standby really adds up to, and how much material a room actually needs.
- Cars and travel Real fuel economy, what a trip costs, cost per mile and splitting the bill between everyone in the car.
- Sport Running paces, race-time equivalents, splits and training zones. For running with your head as well as your legs.
- Health and body Body mass index, healthy weight, body fat and daily calories, with the formula in plain sight and what each number leaves out.
- Percentages and maths Discounts, increases, proportions, VAT, averages and grades. Everyday maths, properly explained.
- Business and pricing Margin, markup, commission, asset depreciation and what a campaign costs. The sums you do before setting a price.
- Developers Format JSON, encode and decode, convert bases and colours. The things you look up mid-afternoon with the editor open.