📅 Dates & time
When Does Daylight Saving Time End? Dates for 2026 to 2030
The dates daylight saving time ends and starts in the US and Europe from 2026 to 2030, how the rules work, who skips it, and what changes for scheduling.
When Is Thanksgiving? Dates for 2026 to 2032 (US and Canada)
US Thanksgiving is the fourth Thursday of November. See the dates for 2026 to 2032, plus Black Friday and Canadian Thanksgiving, and how to count the days left.
How Many Days Until Halloween? Date, Weekday and Countdown
Halloween is always October 31. See which weekday it falls on from 2026 to 2031, where the holiday comes from, and how to count the days left.
How to Calculate Age From a Date of Birth (Step by Step)
Learn how to calculate exact age in years, months and days from a date of birth, with worked examples, leap year tips and the mistakes to avoid.
Leap Years Explained: Rules, Examples and Leap Day Birthdays
Why we have leap years, the exact rule for which years count, how leap day birthdays work and how a leap year changes date calculations.
How Old Am I? Age Chart by Birth Year
Find your age from your birth year with a simple chart that updates each year, plus how to get your exact age in years, months and days.
Time Zones Explained: UTC, Offsets and Scheduling Mistakes
How time zones and UTC offsets work, why abbreviations like CST are ambiguous, how daylight saving changes offsets, and how to schedule across zones.
💵 Money & work
How to Calculate Percentage Increase and Decrease
Formulas and worked examples for percentage increase, decrease, percent of a number, reverse percentages, markup versus margin and common mistakes.
Hourly to Salary: How to Convert Hourly Pay to Yearly Pay
Convert hourly pay to an annual salary and back, with the 2,080-hour rule, unpaid leave, part-time hours, overtime and a quick reference table.
Full Retirement Age Explained (US Social Security)
What full retirement age is, how it depends on your birth year, what claiming at 62 or 70 does to your benefit, and how it differs from Medicare eligibility.
Percentage Table: 5%, 10%, 15%, 20% and 25% of Common Numbers
A quick reference table of 5%, 10%, 15%, 20% and 25% of common numbers from 10 to 1,000, plus the mental math shortcuts to work out any percentage fast.
How to Calculate a Raise and Compare It With Inflation
How to work out a pay raise in dollars and percent, and how to compare it with inflation to see whether your buying power really grew, with a table of examples.
How Much to Tip in the US: A Guide by Situation
Typical US tip amounts for restaurants, bars, delivery, taxis, hair salons and hotels, whether to tip before or after tax, and how to split a bill.
❤️ Health & sleep
What Is BMI? How It's Calculated and Where It Falls Short
How body mass index is calculated in metric and US units, what the adult categories mean, healthy weight ranges by height, and the limits of BMI.
Chronological Age vs Biological Age: What's the Difference?
Chronological age counts the years since birth, while biological age tries to estimate how your body is aging. Learn how each works and what to trust.
Sleep Cycles Explained and How Many You Need
How 90-minute sleep cycles work, what happens in each stage, how many hours of sleep people of different ages need, and how to time your bedtime.
🥣 Kitchen & baking
Cups to Grams: A Baker's Guide to Converting Ingredients
Why a cup is not a fixed weight, typical grams per cup for flour, sugar, butter and more, and how to convert any recipe from cups to grams.
Kitchen Measurement Conversions: Cups, Tablespoons, Ounces
A quick reference for kitchen conversions: cups, tablespoons, teaspoons, fluid ounces, milliliters, weights and oven temperatures in Fahrenheit and Celsius.
Butter Conversions: Sticks, Cups, Tablespoons and Grams
Convert butter between US sticks, tablespoons, cups, ounces and grams, with tables for common amounts and a chart for European butter measured in grams.
How Many Grams in a Cup of Flour? Table by Flour Type
A US cup of all-purpose flour is about 125 grams. See typical weights for bread, cake, whole wheat and self-raising flour, and how scooping changes the result.
Sugar Cups to Grams: Granulated, Brown, Powdered and More
How many grams are in a cup of sugar? Typical US cup weights for granulated, caster, brown and powdered sugar, honey and maple syrup, with tablespoon amounts.