ToolBullet Guides
Practical, straightforward guides on the topics behind our tools — writing, health, security, finance and more. No fluff, no sign up required.
How to Count Words
Word count targets for essays, blog posts, social media, speeches and more. Why word count matters and how to hit your target.
READ GUIDE →How to Calculate BMI
What BMI is, how to calculate it, what the categories mean, and its limitations as a health measure.
READ GUIDE →How to Create a Strong Password
What makes a password strong, how long it should be, common mistakes to avoid, and how to manage passwords safely.
READ GUIDE →How to Calculate a Tip
How much to tip at restaurants, for taxis, food delivery and services — including tipping customs in the US, UK, Australia, UAE, Singapore and more.
READ GUIDE →What is Reading Time?
How reading time is calculated, what affects reading speed, and how content creators use reading time to improve engagement.
READ GUIDE →What is VAT and How is it Calculated?
How VAT works, how to add and remove VAT, VAT rates by country including UK, Australia, India, Singapore, UAE and EU.
READ GUIDE →Passphrase vs Password — Which is More Secure?
Why the NCSC and NIST recommend passphrases, how they work and when to use a passphrase vs a password.
READ GUIDE →How Does Compound Interest Work?
The compound interest formula, the Rule of 72, real-world examples and how to make compound interest work for your savings globally.
READ GUIDE →