About FinToolbox
FinToolbox is a collection of free, fast, and privacy-friendly financial calculators built for UK individuals and businesses. We build simple tools that solve real problems — without logins, subscriptions, or intrusive tracking.
What We Offer
Our calculators span seven categories covering the financial questions that matter most:
- VAT calculators — standard VAT, reverse VAT, flat-rate scheme, import VAT, and more
- Tax calculators — income tax, capital gains, dividend tax, national insurance, and self-assessment
- Business calculators — profit margins, break-even, cash flow, payroll, startup valuation, and more
- Property calculators — stamp duty, mortgage repayments, buy-to-let yield, and remortgage savings
- Marketing calculators — ROI, ROAS, customer acquisition cost, conversion rate, and churn
- Savings calculators — emergency fund planning and debt payoff strategies
- Investment calculators — portfolio growth projections and risk/return analysis
All calculators run entirely in your browser — no data is sent to our servers.
Our Philosophy
We believe financial tools should be:
- Fast — instant results with no page reloads
- Accurate — figures based on current UK rates and rules
- Easy to use — clean inputs, clear outputs, no jargon
- Accessible — works on any device, including screen readers
- Free — no paywalls, no sign-ups
- Private — all calculations happen locally in your browser
Contact
Have a suggestion, spotted an error, or want to get in touch? Visit our Contact page.