FinancePlots Now Works Inside Claude: Real Formulas and Data for Your AI Assistant
September 2026 · 6 min read
Ask an AI assistant what a company is worth and you’ll get a confident, well-written answer. What it won’t always tell you is where the multiples came from, what discount rate it used, or whether it remembered the debt. For finance work that’s a problem: a plausible number is not the same as a number you can defend.
That’s why FinancePlots now has a connector for Claude. Once it’s connected, Claude stops estimating: it calls the same calculators and data sources this site uses, and tells you which tool it used.
What a connector is
Connectors are built on MCP, an open standard that lets an AI assistant use outside tools. You ask in plain language; Claude decides which tool it needs, passes it your numbers and explains the result. There’s nothing to learn.
What you can ask it
| Loans and mortgages | Monthly payment, total interest and a year-by-year schedule. |
| Compound interest | How savings grow with a monthly contribution. |
| Break-even | Units and revenue needed to cover your costs. |
| Business valuation | DCF and industry multiples, as enterprise value and as equity value. |
| Startup valuation | Damodaran’s DCF for young companies, a revenue multiple, the last round’s price and cash runway. |
| Damodaran data | Multiples, margins, sales-to-capital and cost of capital for 25 industries (January 2026). |
| US economy | GDP, inflation, unemployment and interest rates from the Federal Reserve (FRED). |
| Markets today | Indices, currencies, gold, oil and Bitcoin. |
| Stock screener | S&P 500, Nasdaq-100 and IBEX 35 filtered on your criteria, listed alphabetically. |
The calculators run the exact same code as the tools on this site, so Claude and the website can’t give you different figures for the same inputs.
An example: what is a startup worth?
This is the case that convinced me it was worth building. Picture a healthcare-software company with £5m of revenue growing 40% a year, but still losing 60p for every pound it bills. It has £3m in the bank, burns about £4.5m a year, and its last round closed at 9p a share with 490 million shares in issue.
A textbook valuation doesn’t work here: with no profits, P/E and EBITDA multiples mean nothing. So I asked Claude to value it three ways with FinancePlots:
| Method | Equity value | Basis |
|---|---|---|
| Last funding round | £44.1m | 9p × 490m shares |
| Revenue multiple (5.3×) | £29.5m | Healthcare IT average, plus cash |
| Damodaran DCF | £13.6m | 2.8p per share |
The DCF follows the method Aswath Damodaran sets out for young companies. It doesn’t abandon discounted cash flow — it adapts it.
- →Revenue grows at 40% for five years, then slows to 2.5% by year 10.
- →The margin moves from today’s −60% to the industry’s typical 14.7% (Damodaran data, January 2026).
- →Growth has to be paid for: every £1.25 of new revenue needs £1 of investment.
- →Past losses (£17m) shelter profits from tax until year 9.
- →The cost of capital falls from 12% to 8.2% as the business matures.
- →And most important: a 30% chance it never gets there.
The lesson isn’t in any of the three numbers but in the gap between them. A round price is not a valuation: it’s what an investor paid for preferred shares that get paid first if things go wrong. The DCF asks what the business itself is worth — and says almost all of that value depends on a future that starts seven years from now. That conversation — what has to go right to justify 9p? — is far more useful than any single figure.
And because every assumption is on the table, you can change one — what if the target margin were 20%? — and see the effect straight away.
How to connect it in two minutes
- →In Claude, go to Settings → Connectors → Add custom connector.
- →Name it FinancePlots and paste this URL:
https://www.financeplots.com/api/mcp - →In a new chat, switch FinancePlots on in the tools menu and ask away.
It’s free, needs no account and doesn’t store what you send. There are instructions for Claude Code and other apps on the connector page.
What it won’t do
It doesn’t recommend investments. The stock screener applies the criteria you set and lists companies alphabetically, with no scores or rankings. And a model is only as good as its assumptions: the tool gets the arithmetic right, but the growth, the margin and the odds of failure are your call.
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This article is for informational purposes only and does not constitute financial advice. The company in the example is fictional.