Guides & Articles
Practical explanations to help you understand the numbers behind our calculators — from how mortgage repayments work to what your BMI actually means.
How to Calculate Stamp Duty in the UK (2025 Guide)
A complete guide to UK stamp duty land tax (SDLT) — current rates, how it is calculated, first-time buyer relief, and examples to help you work it out.
Take-Home Pay in the UK Explained (2025/26 Tax Year)
Understand exactly how much of your salary you actually keep after income tax, National Insurance, and other deductions. Includes current 2025/26 rates and worked examples.
Compound Interest Explained — How Your Money Grows Over Time
What compound interest is, how it is calculated, why it is so powerful for savings and investments, and how to use it against debt.
How to Calculate Your Monthly Mortgage Repayments
Learn exactly how mortgage repayments are calculated, what affects your monthly payment, and how to use a mortgage calculator effectively. Includes UK examples.
BMI: What It Is, How It's Calculated, and What Your Number Means
Body Mass Index explained — the formula, what healthy BMI ranges mean, the limitations of BMI as a health measure, and when to use other measurements instead.
What Is VAT and How Is It Calculated in the UK?
A plain-English guide to UK VAT — the current rates, how to add and remove VAT, when businesses must register, and how to use a VAT calculator.