Free UK Calculators Built for Real People
CalcKit is a free collection of business, finance, property, and health calculators built specifically for the UK. No jargon, no signups, no nonsense — just accurate answers instantly.
Why We Built CalcKit
Running a business in the UK means constantly dealing with numbers — VAT, income tax, profit margins, stamp duty, break-even points. The calculations aren't difficult, but having to work them out manually or hunt for a reliable tool every time is a genuine friction.
CalcKit started as a simple solution to that problem. We wanted a single place to find accurate, up-to-date UK calculators — covering finance, property, business, and health — that just worked. No registration, no premium tiers, no limitations.
Every calculator on CalcKit is built around the current UK tax year rates and official guidelines. We review them after every Budget announcement and update them at the start of each new tax year, so you can trust the results.
What We Stand For
Built for the UK
Every calculator uses current UK rates, thresholds, and rules. We update for each new tax year so you always get accurate results.
Instant results
No forms to fill in, no email required, no account to create. Enter your numbers and get your answer immediately.
Your data stays private
All calculations happen in your browser. We never send your numbers to a server, store them, or share them with anyone.
Free, forever
CalcKit is and will always be free to use. We keep the lights on through unobtrusive advertising, not paywalls or subscriptions.
Works everywhere
Fully responsive on desktop, tablet, and mobile. Use it at your desk or quickly check a figure on your phone.
Regularly updated
We review all calculators after every UK Budget and update rates, thresholds, and rules to match the current tax year.
What CalcKit Covers
Finance
- Profit Margin Calculator
- UK VAT Calculator — Add or Remove VAT
- Income Tax Calculator UK 2025/26 — Take Home Pay
- Freelancer Day Rate Calculator
- Break-Even Calculator
- Markup Calculator
- ROI Calculator
- UK Savings Goal Calculator — ISA & Compound Interest
- Salary to Hourly Calculator UK — Convert Any Salary Instantly
- Dividend Tax Calculator
- Discount Calculator
- Salary Sacrifice Calculator
- Pro Rata Salary Calculator UK — Part-Time & Holiday Pay
- Salary Sacrifice Car Calculator UK 2025/26
Property
A Note on Accuracy
CalcKit calculators are designed for general guidance and quick estimates. They use current UK rates and standard calculation methods. However, everyone's financial situation is different. For significant financial decisions — particularly tax planning, property purchases, or business finance — we strongly recommend consulting a qualified UK accountant, financial adviser, or solicitor.
Who Builds CalcKit
Muhammad Murtaza
Founder, CalcKit
CalcKit was built by Muhammad Murtaza, a UK-based developer and entrepreneur with a background in finance and software engineering. After spending years hunting for reliable, up-to-date UK calculators and coming up short, he built CalcKit to solve that problem — for himself first, and for the thousands of UK business owners, freelancers, and homeowners who face the same friction every day.
Get in Touch
Found a bug? Think a rate is out of date? Want to suggest a new calculator? We genuinely appreciate feedback — it helps us make CalcKit better for everyone.
You can reach us at hello@calckit.co.uk. We aim to respond within 2 working days.