About Calcu
Calcu is an independent UK calculator site that turns confusing benefits, bills and everyday money questions into clear, instant answers — built around the official figures published by GOV.UK, the DWP and other UK authorities.
Who runs Calcu
Calcu is an independent website operated by Mustafa Bilgic. It is not a government service, a benefits agency, a financial adviser or a claims-management company, and it is not connected to GOV.UK, the Department for Work and Pensions (DWP), HMRC, the NHS or any other official body. We are a small, privately run publisher that builds free online calculators for people across the UK.
The site exists for one reason: the everyday numbers that affect real life — what you might be entitled to in benefits, what a bill should cost, how much holiday you've earned, your exact age — are governed by official rules that are scattered, jargon-heavy and updated every year. Most people just want a quick, honest answer. Calcu gives that answer in seconds, with no sign-up and no cost.
What Calcu does
Calcu brings together more than eighty free calculators in one beautifully simple place. They cover the questions that come up at home:
- Benefits & entitlement — Universal Credit, Pension Credit, Housing Benefit, Carer's Allowance, PIP, Attendance Allowance and the benefit cap, using the latest DWP rates.
- Bills & money — council tax, energy and water bills, budgets, savings interest, loans and UK inflation.
- Health & body — BMI, calories, BMR, due dates and more, using recognised NHS-aligned methods.
- Dates & conversions — your exact age, days between dates, and clear metric/imperial converters.
Every tool runs entirely in your browser. You never sign in, and the details you type are never sent to us or stored on a server — the calculation happens on your own device, which keeps it completely anonymous.
Our commitment to accuracy
A calculator is only worth using if the figures behind it are right. That is why every Calcu tool is mapped to primary UK sources rather than copied from elsewhere:
- Benefit rates — such as the £400.14 monthly Universal Credit standard allowance for a single person 25 or over, the 55% earnings taper and the £6,000/£16,000 capital limits — come straight from the DWP and GOV.UK 2025/26 figures.
- Bill calculators use published Ofgem price-cap unit rates and standing charges.
- Health tools use established, peer-reviewed formulas such as Mifflin-St Jeor for calories.
- Conversions use exact internationally agreed factors (for example 2.54 cm per inch).
We re-check the figures whenever the government uprates benefits or a regulator changes a cap, and we link you straight to the official source on each page so you can verify the rules yourself.
Calcu provides general estimates for information only. Benefit figures are a guide, not a benefit award, and nothing here is personalised financial advice. Your real entitlement depends on a full assessment of your circumstances — always confirm with an official check on GOV.UK or a free adviser at Turn2us or Citizens Advice.
Why you can trust Calcu
We believe trust is earned through transparency, so we try to be open about how the site works:
- We show our sources. Pages link directly to GOV.UK, the DWP and other official guidance.
- We don't gate anything. Every tool is free, with no account, paywall or email capture.
- We respect your privacy. Calculations run in your browser; we don't collect the income, savings or health details you enter. See our privacy policy for how cookies and advertising work.
- We are independent. The site is funded by advertising, which keeps it free — but adverts never change the figures a calculator produces.
If you ever spot a figure that looks out of date or wrong, please tell us. Accuracy is the entire point of the site, and reader corrections help us keep it that way — get in touch through our contact page.