# Adding Machine Calculator

> Add a signed list of amounts and show a running total like a tape calculator.

Page: https://askcalculators.com/calculator/adding-machine-calculator/
Definition: https://askcalculators.com/calculator/adding-machine-calculator/definition.json
JSON Schema: https://askcalculators.com/calculator/adding-machine-calculator/schema.json
Version: 1.0.0
Maintained by: AskCalculators (software project; not a credentialed reviewer)
Qualified review: pending. Automated checks do not establish professional approval.
Page status: Live
Review status: Pending

## Use
Open the calculator page and enter values. Query-string parameters can restore and bookmark a calculation.
Example: https://askcalculators.com/calculator/adding-machine-calculator/?entries=125.50%2C+-20%2C+35.25%2C+-4.75

## Inputs
- entries: Signed numbers (comma or space separated); type=text; required; default=125.50, -20, 35.25, -4.75

## Outputs
- total: Total; format=number; primary
- entryCount: Number of entries; format=integer
- positiveTotal: Positive entries; format=number
- negativeTotal: Negative entries; format=number

## Formula
running total = Σ signed entries

## Rules
- Empty optional inputs are undefined, not zero.
- Hidden conditional inputs are ignored.
- Do not invent missing required inputs.