Resources

Free tools for founders who want to know their numbers.

Practical tools and plain-English maps of your numbers - built for consumer brand founders who are serious about profitability.

Free · available now

The Money Map

See exactly where your Amazon money went last month - what you kept, and what Amazon took, in plain English. Runs inside the AI you already use, on your own report.

Open the Money Map →
Free · available now

The Amazon Payout Status Map

See the payout transfers Amazon recorded this period and how much is still marked Deferred - a clear status snapshot, not a guess about your bank. Runs inside the AI you already use, on your own report.

Open the Payout Status Map →
Free · available now

The Holiday Storage Check

See what your Amazon storage costs today and what the identical inventory costs at the higher October to December rates. One report, no questions asked - it never tells you how much stock to send.

Open the Storage Check →
Free · available now

The Inventory Map

See how many units you're holding in Amazon's warehouses and what it costs you every month to store them - including the aged inventory surcharge on stock that's sat too long. Runs inside the AI you already use, on your own report.

Open the Inventory Map →
Free · available now

Amazon FBA Unit Economics

See what it costs to sell one unit on Amazon - in a regular month and at holiday peak rates. Referral, FBA fulfillment, storage, placement, 3PL, ads and returns, from Amazon's own published 2026 rate cards.

Open the calculator →
Free · available now

The Inbound Placement Fee Check

Amazon charges a fee to send your shipment to one warehouse, and nothing to spread it across five or more. See which option actually costs less once your own freight is in, on Amazon's published 2026 rates.

Open the calculator →
Free · available now

Too Many or Too Few

Ordering too much ties up cash in stock you have to discount. Ordering too little gives up sales you could have made. Put one product in and see which mistake actually costs you more.

Open the calculator →
Free · available now

Shopify Fee Calculator

See what each Shopify plan really costs you in fees, and which one costs the least at your revenue. Plan cost, processing rate, and per-transaction fees, all in one number.

Open the calculator →
Free · available now

Can I Afford This Order?

An order can be profitable and still empty your account in week six. Put in your cash, the lowest balance you are willing to see, and when each payment falls due - then see your cash week by week, with the order and without it.

Open the cash check →

New tools ship regularly. They land here first.

Stay in the loop

Want to hear when new tools drop?

Get new tools and plain-English finance tips as they land. Unsubscribe any time.

We'll only use your email to send you new tools and the occasional note - unsubscribe any time. See the Privacy Policy.

Daily content

Follow along on Instagram.

Daily posts breaking down Amazon fees, ecommerce margin concepts, and financial strategy for founders - in plain English.

@marginsandme →