Celsius, Fahrenheit and Kelvin: Formulas and Oven Marks
Temperature scales do not share a zero, so conversion needs a multiplication and an addition. Here are the exact formulas, a quick estimate, and an oven chart.
Articles, page 2
Plain-English guides to the numbers in everyday life: how a calculation works, where people go wrong, and which tool to reach for.
Clothing Size Conversion: Measure Your Body, Not the Label
A US 8, UK 12 and EU 40 are often listed as equals, yet brands label garments differently. Compare your measurements with a size chart instead, converting inches to centimeters.
Common Probability Mistakes and How to Avoid Them
Probability is full of results that feel wrong. Here are five classic mistakes, each with a short calculation showing the correct answer.
Compare Unit Prices: Which Size or Brand Is Really Cheaper?
The bigger pack is not always the better value. Divide price by quantity, use the same unit for both, and the cheaper choice becomes obvious.
The Compound Interest Formula, Step by Step
Compound interest is interest that earns interest. Here is the formula, a full worked example, and how to rearrange it to find the interest, the time or the rate.
Does Compounding Frequency Matter? Daily vs Monthly vs Yearly
Moving from yearly to monthly compounding adds a visible amount; moving from daily to continuous adds under a dollar. The numbers show where the gains run out.
Converting Between Fractions, Decimals and Percentages
Fractions, decimals and percentages are three ways of writing the same quantity. Learn the six conversions, repeating decimals and the equivalents worth memorising.
How to Convert Between Time Zones Using UTC Offsets
Skip the guesswork: convert the local time to UTC, then to the target zone. Includes half-hour offsets, date changes and a worked meeting-overlap example.
12-Hour to 24-Hour Time: Conversion Rules and Common Slips
Two rules cover every conversion between AM/PM and the 24-hour clock. Here they are, with a reference table, midnight and noon explained, and the usual mistakes.
Correlation Coefficient: How to Calculate and Interpret r
Pearson's r measures how closely two variables follow a straight line. Here is the hand calculation, how to read the result, and where the number can fool you.
Cost-Plus Pricing Step by Step: From Unit Cost to Shelf Price
Cost-plus pricing starts with what a product costs you and works up to a price. Follow the steps, including how fees and sales volume change the result.
Cost Ratios: COGS, Labor and Overhead as a Percent of Sales
A cost ratio divides one expense by your sales. It makes months of different sizes comparable and shows which costs are quietly growing.