JoinCalc is a free collection of financial calculators for US and UK users — no sign-up, no ads interruption, all calculations happen in your browser. Includes: 🏛️ Stamp Duty Calculator (UK 2026) 📊 Capital Gains Tax (US & UK) 🏦 Inheritance Tax (UK IHT & US Estate Tax) 🔥 FIRE Calculator 🔑 Mortgage Affordability 🧓 401k & UK Pension Calculator 💼 Salary Take-Home (US, UK, CA, AU) 📋 Loan Calculator 💰 Dividend Income 📈 Compound Interest All rates updated for 2026.