UltraCalculators
Updated for 2026/27 tax year

384 free calculators
built for the UK

Finance, health, construction and more. Instant results, formula-verified, no sign-up required.

or browse all 9 categories

384 calculators
9 categories
1843+ unit tests
Updated 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.
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Income Tax Calculator
Finance
Calculate your UK income tax for the 2026-27 tax year with England/Wales or Scotland tax bands.
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BMI Calculator
Health & Fitness
Calculate your Body Mass Index and weight category
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Mortgage Calculator
Finance
Calculate your monthly mortgage repayments based on property price, deposit, interest rate, and term.
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TDEE Calculator
Health & Fitness
Calculate your Total Daily Energy Expenditure
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Tip Calculator
Utility
Calculate tip and split the bill between people
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Browse by Category

384 calculators across 9 specialist categories.

Finance

94 calculators

Stamp duty, income tax, salary, mortgage, VAT, and student loan calculators.
Stamp DutyIncome TaxSalary
Health & Fitness

63 calculators

BMI, TDEE, macro, calorie deficit, and pregnancy calculators.
BMITDEEMacro
Construction

53 calculators

Concrete, roofing, drainage, electrical, and structural calculators.
ConcretePaintFlooring
Utility

78 calculators

Percentage, compound interest, postage, and everyday tools.
PercentageAgeTip
Automotive

31 calculators

Fuel cost, mileage, insurance, road tax, and vehicle finance.
Fuel CostEV Charging TimeCar Finance
Education

35 calculators

UCAS points, GCSE grades, student finance, and maths tools.
UCAS PointsStudent BudgetGrade
Garden

10 calculators

Lawn care, planting, compost, and landscaping calculators.
Lawn SeedTopsoilPatio Paving
Energy

9 calculators

Solar panel ROI, heat pump sizing, and energy bill calculators.
Solar Panel ROIHeat Pump SizingEnergy Bill
Pet

11 calculators

Food portions, insurance costs, and care budgeting tools.
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.
1843+ 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 publish our verification process. Read our editorial policy.