Free AI-Powered
Calculators & Tools
Instant results + smart UK insights. Every tool uses live government data and explains your results in plain English.
All Tools
Free, instant, AI-explained — no sign-up required
Solar Panel Savings
See your payback period, annual savings, and 25-year returns from UK solar — postcode specific.
Stamp Duty Calculator
SDLT, LBTT, and LTT for all buyer types. First-time buyer relief, additional-rate surcharge included.
MTD Income Checker
Find out if you must register for Making Tax Digital for Income Tax in 2026/27, 2027/28, or 2028/29.
Heat Pump / BUS Calculator
Model your heat pump ROI including the £7,500 BUS grant and the new £2,500 air-to-air grant.
Take-Home Pay Calculator
Full 2026/27 PAYE, NI, Scottish rates, student loans, and salary sacrifice — every line explained.
Pension & Salary Sacrifice
See exactly what pension contributions cost you — and the 60% tax trap if you earn over £100k.
Not just a number — an explanation
Every CalcAI tool appends a plain-English AI explanation to your result — what drives your figures, an honest caveat, and what you'd need to know next. Grounded in your specific inputs, never generic.