About UK Calculator
Free financial calculators for UK residents, built from official government data
Our Mission
UK Calculator provides free online calculators for UK tax, salary, mortgage, pension and other financial topics. Every calculator uses rates and thresholds from official government sources such as HMRC, GOV.UK and the Bank of England. The site is not affiliated with HMRC, GOV.UK, DWP or any UK government body.
About the Operator
UK Calculator is independently operated by a single person. There is no editorial team, no board of advisers, and no professional accreditation behind the site.
Operator Details
Mustafa Bilgic
Sole Operator — UK Calculator
Mustafa Bilgic runs UK Calculator as a sole trader from Adiyaman, Turkey. He is not a qualified accountant, adviser or tax professional. The site offers free tools for UK residents. Formulas are built from official government data. Outputs are tested against HMRC worked examples where available. Last sitewide review: July 2026.
For questions, corrections, or feedback please email [email protected].
Operated by: Mustafa Bilgic (sole trader)
Location: Adiyaman, Turkey (operating remotely)
Email: [email protected]
Our Commitment to You
Always Free
Every calculator and guide will always be free to use. No hidden charges, no premium tiers, no subscription fees.
Always Current
Tools are reviewed each tax year. They are updated when rules change.
Always Private
Your financial data stays in your browser. We don't track, store, or sell any personal information.
How Calculators Are Built
Tax & Payroll
Tax tools use income tax rates, NI thresholds, and allowances from HMRC. Rates are checked against HMRC data each April.
Finance & Property
Mortgage, pension, and investment tools use the Bank of England base rate and ONS data. Default rates update when the base rate changes.
Health & Wellbeing
Health tools (BMI, BMR, calorie) use standard formulas from NHS guidance. They give general estimates. They do not replace medical advice.
Education
UCAS, grade, and student finance tools use official UCAS tariff tables and Student Loans Company data. Checked each September.
Verification Process
- Source Research: Each tool uses rates from official documents (HMRC, GOV.UK, DWP).
- Test Cases: Outputs are checked against HMRC/GOV.UK worked examples.
- Browser Testing: Tools are tested across devices to make sure they work.
- Annual Review: Every tool is checked each April (tax year) and September (academic year).
- Rate Updates: When HMRC announces rate changes, affected tools are updated.
- Error Reports: Users report issues by email. Confirmed errors are fixed and the page date is updated.
How UK Calculator Is Funded
UK Calculator is free to use. The site is funded by display ads through Google AdSense. Advertisers do not influence content, formulas, or results. No data from your inputs is shared with advertisers. All maths runs in your browser.
For details about advertising cookies, see the Privacy Policy. You can manage ad preferences via Google Ad Settings.
Get in Touch
Have questions, found an error, or want to suggest a calculator? Email [email protected] or use the contact form.
Important: UK Calculator is not affiliated with HMRC, GOV.UK, DWP or any UK government body. All calculator results are estimates for general guidance only and are not financial, tax or legal advice. Seek professional advice before making financial decisions.
Independence: UK Calculator is an independent site operated by Mustafa Bilgic as a sole trader. It is not affiliated with, endorsed by, or connected to HMRC, GOV.UK, DWP, the NHS or any government body. Rates are sourced from official publications and every result is an estimate for guidance only — not financial, tax, legal or medical advice.