Market Capitalization Calculator
Market capitalization is the product of a company's shares outstanding and its current share price. It provides a snapshot of company size used widely in investing, index construction, and regulatory reporting.
This calculator computes market capitalization from the values you provide and includes an optional free-float adjustment to reflect the portion of shares readily tradable in the market. Use the reporting currency field to document the currency of the share price; currency conversion is not performed automatically.
Governance
Record 6634f321934d • Reviewed by Fidamen Standards Committee
Inputs
Results
Market Capitalization
$10,000,000.00
Market Capitalization (billions)
1
| Output | Value | Unit |
|---|---|---|
| Market Capitalization | $10,000,000.00 | — |
| Market Capitalization (billions) | 1 | — |
Visualization
Methodology
Primary calculation: multiply shares outstanding by share price, then apply free-float percent if you want a tradable-market estimate rather than total-issued shares.
Precision and numeric behavior follow common engineering and data-quality practices; be aware of floating-point rounding and presentational rounding. For deterministic financial systems implementers should follow IEEE 754 guidance for binary floating-point or a fixed-point/decimal arithmetic standard appropriate to regulatory reporting.
For quality assurance, logging, and auditability follow organizational controls and data-quality standards (for example ISO data-quality best practices). For secure handling, follow NIST recommendations on software and data integrity. For workplace and procedural safety consult applicable occupational rules.
Worked examples
Example 1: 50,000,000 shares × $12.00/share with free-float 100% → Market Cap = 600,000,000 (600 million).
Example 2: 200,000,000 shares × €4.50/share with free-float 85% → Market Cap (free-float) = 200,000,000 × 4.50 × 0.85 = €765,000,000.
F.A.Q.
Does this tool convert currencies?
No. Enter the share price in the reporting currency you intend to use. If you need conversion, convert the share price to the target currency before using this calculator.
What is the difference between total market cap and free-float market cap?
Total market cap uses all issued shares. Free-float market cap multiplies by the percentage of shares that are publicly tradable, excluding locked-in holdings such as large insiders or government stakes.
How accurate are results for very large numbers?
This calculator uses basic numeric arithmetic. For production or regulatory reporting systems, use decimal-based arithmetic or validated libraries and follow IEEE 754 guidance to avoid rounding anomalies. Validate results against authoritative data sources before publication.
Does the tool account for convertible securities, options, or diluted shares?
No. If you need fully diluted market capitalization include conversions and outstanding dilutive instruments in the shares outstanding input or perform a separate diluted calculation.
Are there compliance or audit considerations?
Yes. Maintain an auditable trail of inputs, timestamps, currency, and calculation method. For controls and data integrity follow applicable internal policies and standards referenced in the methodology section.
Sources & citations
- NIST — https://www.nist.gov
- ISO (data quality standards) — https://www.iso.org
- IEEE Standard 754 (floating-point arithmetic) — https://standards.ieee.org/standard/754-2019.html
- OSHA (procedures and workplace safety resources) — https://www.osha.gov
- SEC — Investor.gov Educational Resources — https://www.investor.gov/
- CFA Institute — Global Investment Performance Standards (GIPS) — https://rpc.cfainstitute.org/gips-standards
- FINRA — Investment Products — https://www.finra.org/investors/investing/investment-products
Further resources
Versioning & Change Control
Audit record (versions, QA runs, reviewer sign-off, and evidence).
Record ID: 6634f321934dWhat changed (latest)
v1.0.0 • 2025-11-18 • MINOR
Initial publication and governance baseline.
Why: Published with reviewed formulas, unit definitions, and UX controls.
Public QA status
PASS — golden 25 + edge 120
Last run: 2026-01-23 • Run: golden-edge-2026-01-23
Versioning & Change Control
Audit record (versions, QA runs, reviewer sign-off, and evidence).
What changed (latest)
v1.0.0 • 2025-11-18 • MINOR
Initial publication and governance baseline.
Why: Published with reviewed formulas, unit definitions, and UX controls.
Public QA status
PASS — golden 25 + edge 120
Last run: 2026-01-23 • Run: golden-edge-2026-01-23
Engine
v1.0.0
Data
Baseline (no external datasets)
Content
v1.0.0
UI
v1.0.0
Governance
Last updated: Nov 18, 2025
Reviewed by: Fidamen Standards Committee (Review board)
Credentials: Internal QA
Risk level: low
Reviewer profile (entity)
Fidamen Standards Committee
Review board
Internal QA
Entity ID: https://fidamen.com/reviewers/fidamen-standards-committee#person
Semantic versioning
- MAJOR: Calculation outputs can change for the same inputs (formula, rounding policy, assumptions).
- MINOR: New features or fields that do not change existing outputs for the same inputs.
- PATCH: Bug fixes, copy edits, or accessibility changes that do not change intended outputs except for previously incorrect cases.
Review protocol
- Verify formulas and unit definitions against primary standards or datasets.
- Run golden-case regression suite and edge-case suite.
- Record reviewer sign-off with credentials and scope.
- Document assumptions, limitations, and jurisdiction applicability.
Assumptions & limitations
- Uses exact unit definitions from the Fidamen conversion library.
- Internal calculations use double precision; display rounding follows the unit's configured decimal places.
- Not a substitute for calibrated instruments in regulated contexts.
- Jurisdiction-specific rules may require official guidance.
Change log
v1.0.0 • 2025-11-18 • MINOR
Initial publication and governance baseline.
Why: Published with reviewed formulas, unit definitions, and UX controls.
Areas: engine, content, ui • Reviewer: Fidamen Standards Committee • Entry ID: 0df895bcfa04