Wid9et Blog
Simple, useful guides that explain everyday calculations, files, online tools, gaming and more - without unnecessary jargon.
What Is Compound Interest and How Does It Work?
Learn what compound interest means, how it grows money over time, how compounding frequency matters and how to calculate it with a simple example.
How to Calculate Compound Interest
A step-by-step guide to calculating compound interest, including the formula, annual and monthly compounding examples and the effect of regular contributions.
Simple Interest vs Compound Interest: What's the Difference?
Understand the difference between simple and compound interest with clear examples, formulas and an explanation of when the difference matters most.
How to Calculate Loan Repayments
Learn what determines a loan repayment, how interest and loan term affect monthly payments and how to estimate the total cost of borrowing.
How Do Mortgage Repayments Work?
A simple guide to mortgage repayments, including capital, interest, repayment terms, rates and why monthly payments can change.
What Is Profit Margin and How Do You Calculate It?
Learn what profit margin means, how to calculate gross profit margin from selling price and cost, and why margin is different from markup.
What Is the Break-Even Point? A Simple Guide
Understand the break-even point, fixed and variable costs, contribution per sale and how to calculate how many units a business must sell to cover its costs.
How to Calculate VAT: Add or Remove VAT Easily
Learn how to add VAT to a net price, remove VAT from a VAT-inclusive price and avoid the common mistake of subtracting the VAT rate directly.
How to Calculate Fuel Cost for a Journey
Work out the estimated fuel cost of a trip from distance, fuel economy and fuel price, with examples for MPG and litres per 100 km.
Percentage Calculations Explained Simply
Learn how to find a percentage of a number, work out percentage increase or decrease and calculate what percentage one number is of another.
How to Calculate Your Exact Age
Learn how exact age is calculated in years, months and days, why simply dividing days by 365 is inaccurate and how birthdays and leap years affect the result.
How to Calculate the Difference Between Two Dates
Find out how date differences work, including elapsed days, inclusive counting, leap years and why calendar calculations can be surprisingly easy to get wrong.
How Unit Conversion Works: A Simple Guide
Understand unit conversion using conversion factors, with simple examples for length, weight, temperature and common metric and imperial units.