FatFIRE Math
A membership site template. Free calculators bring people in, and a paid membership where members plan together.
Make this your business
Your first customer
Here's what a visitor sees when they become a member.
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Find the site
Free calculators, no account needed.
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Run the numbers
See how long their target took from every year since 1928.
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Test a bad year
Replay a retirement that starts in a crash.
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Join a group
$399 a year for a private group of 10 people planning Fat FIRE.
Ask Spark for changes
Your template comes with the Spark agent. Ask for changes, and Spark will update your project.
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Make the calculators for doctors and the group a doctors-only community.
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Add a calculator for paying off the mortgage early.
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Make the groups 6 people instead of 10.
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Offer the membership for $29 a month as well as yearly.
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Most visitors leave after one calculator. Want me to let them email themselves the result?
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Should I write a monthly summary of what each group talked about?
What you don't have to pay for
These are usually separate subscriptions that someone has to connect. Spark includes them in one plan.
What you'd pay for separately
- Website builder and hosting
Separately: $39/mo - Online calculators
Separately: $22/mo - A paid community with group chats
Separately: $129/mo - Admin tools and a database One seat
Separately: $24/mo - A freelance developer to connect it all 10 hours a month at $30 an hour
Separately: $300/mo
Total Separately: $514/mo
With Spark Start for free
Each price is a typical small-business plan, billed monthly. Card fees apply either way.
Common questions
What does it cost?
Nothing to start, and you can publish on Spark's free plan at a spark.site address. Taking payments and using your own domain need a paid plan, from $25 a month. See pricing.
Do I get the original's customers or domain?
No, those stay with the original business, and you choose your own address.
Do I need to know how to code?
No. Ask for changes in plain words.
Who can I ask before starting?
Email support@spark.site and we'll answer.
Start with FatFIRE Math
Here's what happens when you start.
- It opens in your account FatFIRE Math appears as a new project in Spark. New to Spark? You make an account first.
- Make it yours Ask Spark for your name, your look and your prices.
- Connect Stripe and publish Publish and your site goes live at its own address. Taking payments needs a paid plan.