Guided Calculators & Diagnostics

Model share schemes, tax relief and fundraising in minutes, with clear numbers you can trust.

New tools

EMI schemes New

Scheme Compliance Cost Calculator

See what happens to your team's equity and shareholder value if HMRC disqualifies your EMI or CSOP scheme at exit.

4 min Use calculator

Equity management New

Equity Management Gap Diagnostic

A quick diagnostic that scores how your equity operations stack up, and where the biggest gaps are hiding.

6 min Check my score

Equity management New

The Scaleup Diagnostic

Score your readiness across seven areas of the business, from finance to governance, and see where to focus next.

10 min Check my score

EMI schemes New

Equity Scheme Modeller

Model the after-tax difference between EMI, CSOP, unapproved options, growth shares and ordinary shares, for you and your whole company.

5 min Use calculator

Most popular

Equity management Featured

Equity Sharing Calculator

Work out how many shares to give co-founders, key hires and employees, and what that stake could be worth at exit.

5 min Use calculator

Equity management Featured

Shared Ownership Calculator

Work out exactly how many shares or options someone needs to end up with a target percentage of the company.

3 min Use calculator

Fundraising & SEIS/EIS Featured

Investment Round Calculator

Model how your equity changes across one or more investment rounds, including dilution and amount raised.

4 min Use calculator

Equity management

Equity management

Equity Sharing Calculator

Work out how many shares to give co-founders, key hires and employees, and what that stake could be worth at exit.

5 min Use calculator

Equity management

Shared Ownership Calculator

Work out exactly how many shares or options someone needs to end up with a target percentage of the company.

3 min Use calculator

Equity management

Equity Management Gap Diagnostic

A quick diagnostic that scores how your equity operations stack up, and where the biggest gaps are hiding.

6 min Check my score

Equity management

The Scaleup Diagnostic

Score your readiness across seven areas of the business, from finance to governance, and see where to focus next.

10 min Check my score

EMI schemes

EMI schemes

Scheme Compliance Cost Calculator

See what happens to your team's equity and shareholder value if HMRC disqualifies your EMI or CSOP scheme at exit.

4 min Use calculator

EMI schemes

Equity Scheme Modeller

Model the after-tax difference between EMI, CSOP, unapproved options, growth shares and ordinary shares, for you and your whole company.

5 min Use calculator

Fundraising & SEIS/EIS

Fundraising & SEIS/EIS

Investment Round Calculator

Model how your equity changes across one or more investment rounds, including dilution and amount raised.

4 min Use calculator

Fundraising & SEIS/EIS

SEIS/EIS Tax Relief Calculator

See the day-one tax position and gross return an investor gets from SEIS or EIS relief on their investment.

3 min Use calculator

Fundraising & SEIS/EIS

SEIS/EIS Eligibility Quiz

Answer six quick questions to find out if your business is likely to qualify for SEIS or EIS.

2 min Check my score

Growth shares & unapproved options

Growth shares & unapproved options

Growth Shares Calculator

See how growth shares work compared with Ordinary Shares.

3 min Use calculator

Cap table & valuations

Cap table & valuations

Black Scholes Valuation Calculator

The Black Scholes equation is a well known formula for calculating the theoretical value of an option based on a few parameters.

3 min Use calculator

The platform itself allows you to manage all aspects of share and option management concisely in one place. The automations and integrations save you time. But while the platform is great, it is the team that makes Vestd stand out.

Jenny James · Chief Operating Officer, Findr

Great platform. The team always provide brilliant support. I would definitely recommend using Vestd to anyone who needs to set up and administer an EMI scheme.

Sarah T. · Director

Amazing shift from Excel to Vestd. The support team were amazing and did a great job of completing our setup and we have been very pleased at being able to better manage our governance over time.

Dan W. · Co-Founder & CEO

See it in action

Manage your equity the easy way, with Vestd.

Why use an equity calculator before you talk to a lawyer or accountant?

Equity decisions are some of the highest-stakes calls a founder makes, and they're usually made under time pressure: a new hire wants an answer this week, an investor wants terms by Friday. Vestd's calculators exist so you can walk into those conversations with real numbers, not guesses.

Whether you're working out how many shares to grant a co-founder, modelling how a new funding round dilutes your existing cap table, or checking if your business still qualifies for SEIS or EIS relief, small percentage differences compound into very different outcomes at exit. Running the maths yourself first means you ask sharper questions, spot problems earlier, and spend your advisor's time (and your budget) on judgment calls rather than arithmetic.

Every tool here is free and runs entirely in your browser. That's deliberate: we'd rather earn a conversation with you once you can see the shape of your own numbers. As our catalog grows, this hub will keep organising tools by the decision you're trying to make, whether that's setting up a share scheme, pricing an option pool, or getting ready for a funding round.

These calculators give you a strong starting estimate, not formal tax or legal advice. For anything you're about to sign, talk to one of our specialists to sanity-check the details against your specific company and share scheme.

Frequently asked questions

Are these tools really free to use?

Yes. Every calculator and diagnostic on this page is free to use. Some results screens offer an optional way to save or download your numbers, or to talk to a specialist, but that's never a requirement.

How accurate are the results?

Each tool uses the same maths that underpins share scheme and cap table modelling on the Vestd platform. They're a strong, reliable estimate based on what you enter, but they don't replace formal tax, legal or accounting advice for your specific situation.

Is my data stored anywhere?

No. Everything you type into these calculators stays in your browser for that session. Nothing is sent to Vestd's servers unless you explicitly choose to download a CSV or book a call with our team.

Can I get help interpreting my results?

Yes. Most results screens include an option to book a free call with a Vestd equity specialist, who can walk through your numbers and what they mean for your next share scheme, funding round or valuation.

Talk to a specialist

Want a second opinion

We'd love to learn about your business and goals, and demonstrate how our platform will transform the way you share, manage and track ownership.

Meet with Vestd

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THE SHARETECH PLATFORM

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