Applications · Finance & tax
UKCalc
253 free UK calculators across 19 categories, from income tax and stamp duty to pensions, ISAs and everyday conversions.
- Status
- Live Live, free to use
- Access
- Open to try
- Type
- Own product
- Role
- Product owner and developer: calculation engine, rules package, registry and web application.
- Built with
- Next.js
- TypeScript
- Vercel
- Link checked
- Loads; lists 253 calculators (10 October 2026)
The problem
UK financial rules change every tax year and are hard to apply by hand. Many calculator sites hide their assumptions.
Who it is for
UK individuals, sole traders, homebuyers and analysts.
What was built
A registry-driven calculator platform: a shared calculation engine returns inputs, outputs, warnings and assumptions in a stable format, and UK rules are versioned by tax year.
Key features
- 253 calculators in 19 searchable categories
- Tax-year-versioned UK rules (2026/27 shown on relevant tools)
- Shared calculation engine with stated assumptions
- Benchmark fixtures to check results
Results so far
Live and publicly available; the calculator count is taken from the live site.
Limitations and context
- General information only, not financial or tax advice.
- The repository's earlier foundation notes describe a smaller first wave; the live site reflects the current build.