Tools
Free calculators for UK founders
Quick, private calculators for the money questions founders ask most. They run in your browser, nothing you type is sent anywhere, and every rate and limit is checked against GOV.UK and linked on the page.
Dilution calculator
Enter your shareholders, the round and the option pool to see the cap table before and after, the price per share and what the pool really costs founders.
Open the calculatorSEIS and EIS relief calculator
Show an angel what their investment costs after 50% or 30% income tax relief, what they could lose if it fails, and how reinvested gains are treated.
Open the calculatorStart Up Loan calculator
Monthly repayment, total interest and the full schedule for a government-backed Start Up Loan of up to £25,000 over one to five years.
Open the calculator
New to the jargon?
The glossary explains SEIS, EIS, cap tables, term sheets, visas and more in plain English, with the official source for every figure.
Read the startup glossaryNot sure where to begin?
Five steps from idea to first customers, with the best Bizztor guides for each one.
Start hereThe calculators give estimates for general information and are not financial, tax or legal advice. Check the official sources linked on each page and speak to a qualified adviser before you decide.