Free Tools for UK Small Businesses
Practical calculators and generators built for UK contractors, freelancers, tradespeople, and every small business owner. From tax to tiling — we've got you covered.
100% free — no account required for any tool below.
Tax & VAT
VAT Calculator
Add or remove VAT at 20% or 5%. Instant net, VAT, and gross breakdown.
Self Assessment Calculator
Estimate your UK self-assessment tax bill including income tax and National Insurance.
CIS Deduction Calculator
Calculate CIS deductions at 20% or 30% on labour amounts.
Dividend Tax Calculator
Calculate dividend tax for Ltd company directors with optimal salary/dividend split.
Corporation Tax Calculator
Calculate UK corporation tax with marginal relief for profits between £50k–£250k.
Employer NI Calculator
Calculate employer National Insurance contributions and Employment Allowance savings.
Sole Trader vs Limited Company
Compare take-home pay as a sole trader versus a limited company director.
Pricing & Rates
Day Rate Calculator
Convert annual salary to daily, hourly, and weekly contracting rates.
Profit Margin Calculator
Calculate profit margin and markup from cost and selling prices.
Markup Calculator
Calculate selling price from cost and markup percentage.
Salary to Hourly Calculator
Convert between annual salary, monthly, weekly, daily, and hourly rates.
Discount Calculator
Calculate discount amounts, final prices, and stacked discounts.
Freelance Rate Calculator
Calculate your ideal freelance rate based on desired take-home pay and expenses.
Billable Hours Calculator
Track time entries and calculate total billable hours and amounts.
Consulting Fee Calculator
Calculate consulting fees for hourly, daily, project, and retainer engagements.
Design Pricing Calculator
Price logo design, brand identity, and graphic design projects.
Photography Pricing Calculator
Calculate photography session fees including editing and travel costs.
Developer Day Rate Calculator
Find recommended developer day rates by role, seniority, and region.
Tutor Rate Calculator
Calculate tutoring rates by subject, level, and delivery method.
Business
Late Payment Calculator
Calculate statutory interest and compensation on overdue UK invoices.
Break-Even Calculator
Find your break-even point in units and revenue.
ROI Calculator
Calculate return on investment percentage and annualised ROI.
Cash Flow Calculator
Forecast 6 months of cash flow with income and expense tracking.
Contractor Take-Home Calculator
Compare take-home pay across Ltd, umbrella, and sole trader structures.
IR35 Checker
Assess your IR35 status with an interactive questionnaire.
Mileage Calculator
Calculate HMRC mileage allowance claims and tax savings.
Fees
PayPal Fee Calculator
Calculate PayPal fees and find out how much to request to receive your target amount.
eBay Fee Calculator
Calculate eBay selling fees, final value fees, and net profit.
Amazon FBA Calculator
Calculate Amazon FBA fees, referral fees, and profit per unit.
Etsy Fee Calculator
Calculate Etsy listing, transaction, and payment processing fees.
Documents & Generators
Quote Generator
Build a professional quote with line items and totals.
Invoice Number Generator
Generate sequential or date-based invoice numbers with a custom prefix.
Payment Terms Generator
Create professional payment terms text for invoices and quotes.
Invoice Builder
Create a professional PDF invoice — completely free, no sign-up.
Email Signature Generator
Create a professional HTML email signature for Gmail and Outlook.
QR Code Generator
Generate free QR codes for URLs, text, WiFi, vCards, and more.
Trade Calculators
Van Running Cost Calculator
Calculate annual van running costs including fuel, insurance, and servicing.
Electrical Load Calculator
Calculate total electrical load, cable sizes, and MCB ratings.
BTU Calculator
Calculate radiator BTU requirements and heat loss for any room.
Brick Calculator
Calculate bricks, mortar, and materials needed for a wall.
Paint Calculator
Calculate paint coverage, litres needed, and tins to buy.
Tiling Calculator
Calculate tiles, adhesive, and grout needed for any area.
Plastering Calculator
Calculate bags of plaster and PVA needed for walls and ceilings.
Scaffolding Calculator
Estimate scaffolding hire costs for any building or facade.
Concrete Calculator
Calculate concrete volume and bags needed for slabs, footings, and columns.
Radiator BTU Calculator
Calculate the correct radiator BTU output for any room size.
Plumbing Pipe Size Calculator
Work out the correct pipe diameter for any flow rate and pressure requirement.
Roofing Materials Calculator
Calculate roofing tiles, felt, battens, and ridge tiles for any roof.
Flooring Calculator
Calculate flooring area, boards or tiles needed, and estimated cost.
Fencing Calculator
Calculate fence panels, posts, gravel boards, and materials needed.
Decking Calculator
Calculate decking boards, joists, fixings, and estimated cost for any deck.
Insulation Calculator
Calculate insulation rolls or boards needed for walls, floors, and lofts.
Drainage Fall Calculator
Calculate the correct fall gradient for drainage pipes and gutters.
Timber Calculator
Calculate linear metres, volume, weight and cost for structural and joinery timber.
Rendering Cost Calculator
Estimate materials, bags needed, and labour cost for sand cement, monocouche, and silicone render.
Want automatic invoicing, reminders and payments?
InvoiceAdept brings all these tools together with automated payment reminders, Stripe payments, and cashflow forecasting — so you spend less time chasing money.
Start free trial — no credit card needed