Free UK Business &
Finance Calculators
Instant, accurate calculators for UK businesses, freelancers, and homeowners. No signup. No ads. Always free.
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View all →Profit Margin Calculator
Calculate your gross profit margin, net margin, and markup instantly. Essential for UK businesses and freelancers pricing their products and services.
PopularVAT Calculator
Add or remove VAT from any price instantly. Supports all UK VAT rates — standard 20%, reduced 5%, and zero rate.
PopularUK Income Tax Calculator
Calculate your exact take-home pay, income tax, and National Insurance contributions for 2025/26. Includes student loan deductions.
PopularFreelancer Day Rate Calculator
Find out exactly what day rate and hourly rate to charge as a UK freelancer based on your desired annual income, tax, and expenses.
PopularStamp Duty Calculator
Calculate exactly how much stamp duty you will pay on any UK property purchase. Updated for 2025/26, including first-time buyer and second home rates.
PopularMortgage Affordability Calculator
Estimate how much you can borrow based on your income. See monthly repayments for different loan amounts and interest rates.
PopularEcommerce Profit Calculator
Calculate your actual profit per order after product costs, shipping, platform fees, and advertising spend. Works for Shopify, Amazon, eBay, and Etsy.
PopularBMI Calculator
Calculate your BMI and see which health category you fall into. Includes NHS guidelines and healthy weight ranges.
PopularSleep Calculator
Find the optimal times to wake up based on 90-minute sleep cycles so you wake feeling refreshed instead of groggy.
Popular💷 Finance Calculators
All finance →🏠 Property Calculators
All property →Latest Articles
All articles →What is Profit Margin? A Plain English Guide for UK Businesses
Profit margin is one of the most important metrics for any business. Here is everything you need to know in plain English.
How to Price Your Products: The Complete UK Guide
Pricing is one of the most impactful decisions you will make. Get it right and your business thrives. Get it wrong and you work hard for nothing.
UK Income Tax Bands 2025/26 — Complete Guide
Everything you need to know about UK income tax for 2025/26 — rates, thresholds, and how to calculate your tax bill.
Why Use CalcKit?
Built specifically for UK businesses and individuals. All calculators use current 2025/26 rates and are updated regularly.