199 Free UK Calculators

Finance, health, construction and more: instant results, no sign-up required.

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199+ calculators

9 categories

957+ unit tests

Updated for 2026/27

Most Popular

The calculators UK visitors use every day.

Stamp Duty Calculator

Finance

Calculate stamp duty land tax (SDLT) or land and buildings transaction tax (LBTT) on your property purchase.

Instant results

Income Tax Calculator

Finance

Calculate your UK income tax for the 2026-27 tax year with England/Wales or Scotland tax bands.

Instant results

BMI Calculator

Health & Fitness

Calculate your Body Mass Index and weight category

Instant results

Mortgage Calculator

Finance

Calculate your monthly mortgage repayments based on property price, deposit, interest rate, and term.

Instant results

TDEE Calculator

Health & Fitness

Calculate your Total Daily Energy Expenditure

Instant results

Tip Calculator

Utility

Calculate tip and split the bill between people

Instant results

Browse by Category

199 calculators across 9 specialist categories.

Finance

50 calculators

Stamp duty, income tax, salary, mortgage, VAT, and student loan calculators for UK finances.

Stamp DutyIncome TaxSalary

Health & Fitness

43 calculators

BMI, TDEE, macro, and calorie deficit calculators for your health and fitness goals.

BMITDEEMacro

Construction

43 calculators

Concrete, paint, and flooring calculators for your building and renovation projects.

ConcretePaintFlooring

Utility

17 calculators

Percentage, tip, and age calculators for everyday calculations.

PercentageAgeTip

Automotive

29 calculators

Fuel cost, mileage, and vehicle tax calculators for UK motorists.

Fuel CostEV Charging TimeCar Finance

Education

5 calculators

UCAS points, student budget, grade, reading time, and study planner calculators for UK students.

UCAS PointsStudent BudgetGrade

Garden

4 calculators

Lawn care, planting, compost, and landscaping calculators for UK gardens.

Lawn SeedTopsoilPatio Paving

Energy

4 calculators

Electricity cost, solar savings, and energy efficiency calculators for UK homes.

Solar Panel ROIHeat Pump SizingEnergy Bill

Pet

4 calculators

Food portions, vet costs, and care budgeting calculators for UK pet owners.

Dog FoodCat FoodPet Insurance Cost

How We Build Calculators

Every calculator is built for accuracy, transparency, and trust.

Formula Verified

Every formula is tested against official sources: HMRC worked examples, NHS guidelines, Ofgem rates.

957+ Unit Tests

Automated tests verify every calculation. When rates change, tests catch it before you see wrong numbers.

Open Methodology

We show our sources, explain our formulas, and disclose our AI-assisted workflow. Read our editorial policy.