# Sizewise Money Stack

> How tall is a million dollars? Banknotes as a stack, by weight and on pallets. Turns an amount of money into banknotes: how many notes, how high the stack, what it weighs, the area laid flat and how many EUR-pallets it fills, compared with real objects. US dollar and euro note sizes from the issuers, or your own notes.

Part of usefulweb.app (https://usefulweb.app/). Part of [Sizewise](https://sizewise.usefulweb.app/) (ownerApp: sizewise). Results are deterministic calculations from the inputs and the listed assumptions; the API returns exactly what the web page shows.

## Use it
- Human interface: https://sizewisemoneystack.usefulweb.app/ (interactive tool at https://sizewisemoneystack.usefulweb.app/tool)
- JSON API: POST https://sizewisemoneystack.usefulweb.app/api/v1/calculate with a JSON object of inputs (schema: https://sizewisemoneystack.usefulweb.app/api/v1/tool)
- OpenAPI: https://sizewisemoneystack.usefulweb.app/openapi.json
- MCP (Streamable HTTP): https://sizewisemoneystack.usefulweb.app/mcp - tool `sizewise_money_stack`

## Inputs
- amount (text): Amount - For example 10000, 1 million, 2.5 billion or 1e12.
- currency (select): Notes
- denomination (number): Value of one note
- thicknessMm (number): Thickness of one note (euro and own notes)
- massG (number): Mass of one note (own notes, optional)
- noteLengthMm (number): Note length (own notes)
- noteWidthMm (number): Note width (own notes)
- loadHeightM (number): Load height on a pallet

## Method
- Notes = amount ÷ note value, rounded up. Stack height = notes × thickness; mass = notes × mass per note; flat area = notes × length × width.
- US notes: 6.14 × 2.61 in, 0.0043 in thick, about 1 g each. Check: a stack one mile high holds 14.7 million notes, matching the U.S. Currency Education Program’s “more than 14.5 million”.
- Pallets: the EUR-pallet’s 1.2 × 0.8 m deck (Wikidata Q1281598) is filled with notes in the best row arrangement, stacked to the chosen load height.

## Limits
- Banknotes in circulation are worn and slightly thicker; real bundles add bands and air. The ECB publishes no thickness or mass for euro notes: those values are your assumption.