What it does: Calculates percentages, percentage changes, sale discounts and the original price before a discount.
Monetisation: Display advertising and shopping-related affiliate links.
SEO opportunity: “Percentage calculator”, “20% off calculator” and “percentage increase calculator”.
Why include it: It is easy to implement, serves a broad audience and makes a useful entry-level tool for your website.
These recommendations reflect calculator categories already featured on UK calculator sites and financial guidance platforms. Salary, mortgage, VAT, savings and percentage tools are established categories, while energy costs and specialist calculators give you additional angles to explore.