Free online calculators for UK businesses, freelancers, and homeowners. Income tax, VAT, mortgage, profit margin, stamp duty, IR35, BMI and more. No signup.
CalcKit is a free collection of 22 UK-specific calculators for
businesses, freelancers, contractors, and homeowners.
No signup. No paywalls. Results in seconds.
š§® Finance ā Income tax, VAT, dividend tax, freelancer day rate,
IR35, salary-to-hourly, profit margin, markup, break-even, ROI
š Property ā Stamp duty (April 2025 rates), mortgage
affordability, rental yield, rent affordability
š¼ Business ā Ecommerce profit, contractor vs employee,
IR35 inside vs outside
ā¤ļø Health ā NHS BMI, calorie/TDEE, sleep cycles, water intake
All calculators use current 2025/26 HMRC rates and UK legislation.
Built for UK users who are tired of US-centric tools that get the
tax maths wrong.
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