# Vault share price: converting between shares and assets

A vault share price expresses how many underlying asset units a share represents under the vault’s accounting. The share count can remain fixed while that conversion changes. For ERC-4626 vaults, conversion estimates, operation-specific previews and maximum-action limits answer different questions; none alone guarantees a future withdrawal amount or a positive investment return.

Evidence: [Tokenized Vaults](https://eips.ethereum.org/EIPS/eip-4626); [ERC-4626](https://docs.openzeppelin.com/contracts/5.x/erc4626)

Canonical: https://degreesofsatoshi.com/encyclopedia/vault-share-price/
Published: 2026-10-02
Substantively modified: 2026-10-02
Independently verified by an automated reviewer: 2026-10-02T18:19:48.887Z
Data current through: 2026-10-02

AI-assisted research and drafting with a separate automated source-verification pass; no external expert or named human review is implied.

## Key facts

- **Units:** ERC-4626 distinguishes underlying assets from vault shares. ([Tokenized Vaults](https://eips.ethereum.org/EIPS/eip-4626))
- **Conversion:** convertToAssets and convertToShares exclude fees and round down under the standard. ([Tokenized Vaults](https://eips.ethereum.org/EIPS/eip-4626))
- **Limits:** Preview methods do not account for deposit or withdrawal limits; max methods address limits separately. ([Tokenized Vaults](https://eips.ethereum.org/EIPS/eip-4626))

## Measure value in the underlying asset first

In a simplified proportional vault with 120 assets and 100 shares, each share corresponds to 1.2 assets. A holder’s ten shares represent 12 assets before any fees or rounding.

This ratio is an illustration, not a universal implementation formula. Virtual balances, accounting choices and the standard’s permitted conversion estimates can change the exact contract calculation.

Evidence: [Tokenized Vaults](https://eips.ethereum.org/EIPS/eip-4626)

## Use the function that matches the intended action

Redeeming a fixed number of shares and withdrawing a fixed number of assets are different requests. The relevant preview includes the operation’s fee treatment and specified rounding direction.

A preview describes conditions at the time of the call. State can change before execution, and the caller must separately check maximum permitted amounts and any enforced execution bounds.

Evidence: [Tokenized Vaults](https://eips.ethereum.org/EIPS/eip-4626); [ERC-4626](https://docs.openzeppelin.com/contracts/5.x/erc4626)

## A higher conversion does not prove earned profit

Donations can alter assets per share without representing strategy income. Fees, losses and valuation of the underlying asset also affect the holder’s economic result.

Do not use a manipulable preview as an unquestioned oracle. ERC-4626 explicitly discusses the distinction between display estimates, close previews and conversion implementations designed for more robust price use.

Evidence: [ERC-4626](https://docs.openzeppelin.com/contracts/5.x/erc4626); [Tokenized Vaults](https://eips.ethereum.org/EIPS/eip-4626)

## Questions

### If the share price rises, must my dollar value rise too?

No. The conversion is measured in underlying asset units. That asset’s dollar price can fall, and fees or other constraints can affect what the holder ultimately receives.

Evidence: [Tokenized Vaults](https://eips.ethereum.org/EIPS/eip-4626); [ERC-4626](https://docs.openzeppelin.com/contracts/5.x/erc4626)

## Claims and scope

### vault-share-price-quick-answer

A vault share price expresses how many underlying asset units a share represents under the vault’s accounting. The share count can remain fixed while that conversion changes. For ERC-4626 vaults, conversion estimates, operation-specific previews and maximum-action limits answer different questions; none alone guarantees a future withdrawal amount or a positive investment return.

Scope: {"collection":"defi","dataAsOf":"2026-10-02","blockHeight":null}

### vault-share-price-fact-units

Units: ERC-4626 distinguishes underlying assets from vault shares.

Scope: {"collection":"defi","dataAsOf":"2026-10-02","blockHeight":null}

### vault-share-price-fact-conversion

Conversion: convertToAssets and convertToShares exclude fees and round down under the standard.

Scope: {"collection":"defi","dataAsOf":"2026-10-02","blockHeight":null}

### vault-share-price-fact-limits

Limits: Preview methods do not account for deposit or withdrawal limits; max methods address limits separately.

Scope: {"collection":"defi","dataAsOf":"2026-10-02","blockHeight":null}

## Sources

- [Tokenized Vaults](https://eips.ethereum.org/EIPS/eip-4626) — Ethereum Improvement Proposals. Assets, shares, deposits, withdrawals, limits and preview rounding. Locator: Specification; Security Considerations. Retrieved: 2026-10-02T17:03:42.366Z.
- [ERC-4626](https://docs.openzeppelin.com/contracts/5.x/erc4626) — OpenZeppelin. Vault share conversion, rounding, donations and inflation-attack defenses. Locator: Security concern: Inflation attack; Defending with a virtual offset. Retrieved: 2026-10-02T17:03:43.088Z.

## Revision history

- 2026-10-02: First publication after primary-source research and independent automated verification.

## Cite this entry

Degrees of Satoshi editorial project. “Vault share price: converting between shares and assets.” Published 2026-10-02; updated 2026-10-02. https://degreesofsatoshi.com/encyclopedia/vault-share-price/