UK Standardized Calculators
CalZone - Calculator Hub For UK
CalZone is a free collection of UK calculators for tax, salary, mortgages, home projects, health and everyday maths. Every calculator uses published UK figures, such as HMRC tax rates and thresholds, GOV.UK statutory rates and NHS guidance, and shows its formula so you can check the result. Rates are reviewed each tax year, and each page shows when it was last updated. CalZone is run by The Calzone from the United Kingdom. Questions or corrections: info@thecalzone.co.uk.
Popular UK Calculators
Explore our most frequently used UK financial, tax, property, construction, and health calculators.
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Mortgage CalculatorMonthly repayments & LTV๐ฐ
Income Tax Calculator2026/27 UK tax & NI bands๐ช
BMI Calculator UKNHS adult BMI & waist guide๐
VAT CalculatorAdd or remove 20% or 5% VAT๐ท
Salary CalculatorTake-home pay, pension & student loan๐ก
Stamp Duty CalculatorHMRC SDLT bands & first-time relief๏ผ
Percentage CalculatorPercentages, changes & discounts๐ณ
Loan CalculatorAPR, monthly payment & interest๐
Road Tax CalculatorDVLA VED rates & luxury supplement๐๏ธ
Concrete CalculatorCubic metres, tonnes & 25kg bags๐
Redundancy CalculatorStatutory redundancy pay (SRP)๐
Mileage CalculatorHMRC 45p/25p MAP allowance๐ฅ
Calorie Deficit UKMifflin-St Jeor TDEE & weight loss๐
Compound InterestLong-term savings & ISA growthBrowse by Category
Find the right UK calculator for your project, finances, or healthVerified UK Formulas
Finance & Tax
Automotive
Home & Property
Construction & DIY
Maths & Percentages
Stock Market & ISA
Fitness & Diet
General Health
Finance & TaxHealth & FitnessMaths & PercentagesHome & PropertyConstruction & DIYAutomotiveUK Investments & ISATime & HoursSleep & RecoveryUniversity & GradesFlooring & AreaVolume & ConcreteTimber & RaftersMaterials & WeightElectrical & CableEnergy & InsulationGardening & TopsoilEmployment & Leave
What's New2026/27
Recently updated UK calculators reviewed for the 2026/27 tax year and current building regulations
UK Salary & Take-Home Pay Calculator (2026/27 Tax Year)
Updated April 2026 ยท HMRC PAYE & NI
Stamp Duty Land Tax (SDLT) Calculator UK
Updated April 2026 ยท First-Time & Additional Thresholds
NHS Adult BMI & Waist-to-Height Calculator UK
Updated April 2026 ยท NICE NG246 Guidance
Statutory Redundancy Pay (SRP) Calculator UK
Updated April 2026 ยท GOV.UK Weekly Cap
Universal Credit Monthly Entitlement & Taper Calculator
Updated April 2026 ยท DWP Standard Allowances
UK Capital Gains Tax (CGT) Calculator for Shares & Assets
Updated April 2026 ยท ยฃ3,000 Annual Exempt Amount
Child Benefit & High Income Charge (HICBC) Calculator
Updated April 2026 ยท ยฃ60kโยฃ80k Taper Band
Statutory Maternity Pay (SMP) 39-Week Calculator UK
Updated April 2026 ยท DWP Statutory Rates
Inheritance Tax (IHT) & Residence Nil-Rate Band Calculator
Updated April 2026 ยท ยฃ325k NRB & ยฃ175k RNRB
BS 7671 18th Edition Cable Size & Voltage Drop Calculator
Updated April 2026 ยท IET Wiring Regulations
Building Regulations Part L U-Value Calculator UK
Updated April 2026 ยท Thermal Elements Guide
DVLA Car Tax (VED) & Refund Calculator UK
Updated April 2026 ยท DVLA VED Bands
Frequently Asked Questions
What is CalZone and who runs it?
CalZone is an independent UK calculator platform operated by The Calzone from the United Kingdom. We build free calculators for UK tax, salary, mortgages, construction projects, health, and everyday maths. You can contact our editorial team at info@thecalzone.co.uk.
Where does CalZone source its tax rates and formulas?
Every calculator uses published UK public-sector and regulatory sources, including HM Revenue & Customs (HMRC) tax bands and National Insurance thresholds, Department for Work and Pensions (DWP) statutory benefit rates, NHS and NICE clinical guidelines, Ofgem energy price caps, and British Standards (BS 7671 / Building Regulations).
Can I check the formula behind a calculation?
Yes. Every calculator page explains how the result is calculated in plain English, provides a worked example with real UK numbers, lists important exceptions and limits, and links directly to the underlying GOV.UK, HMRC, or NHS source.
How often are tax bands and statutory rates updated?
Our editorial team reviews all tax, National Insurance, statutory pay, benefit, and Stamp Duty calculators at the start of each UK tax year (6 April) and following any Autumn Budget or Spring Statement changes. Each page displays its last updated date.
Is CalZone financial, legal, or medical advice?
No. Every calculator on CalZone provides an estimate for general information only. It is not financial, legal, or medical advice. Because outcomes depend on your individual circumstances and legislation that can change, you should always consult a qualified financial adviser, solicitor, accountant, or healthcare professional before making major decisions.
Can I export or save my calculation results?
Yes. Our calculators run directly in your browser without requiring an account, and most tools include a one-click PDF export so you can keep a record of your figures.