Ether Denomination Relationships
ETH, Gwei and Wei are fixed denominations of ether. One ETH equals 1,000,000,000 Gwei and 1,000,000,000,000,000,000 Wei. One Gwei equals 1,000,000,000 Wei. These ratios do not change with the market price of ETH or with demand for Ethereum block space.
Wei is the smallest whole denomination handled by this converter. Every accepted amount is first expressed as an integer number of Wei, then formatted as ETH, Gwei and Wei from that same integer. Changing a selector changes the notation, not the underlying amount. For network roles beyond denomination conversion, use the Ethereum reference page.
The three units suit different scales. Wallet balances and transfers are commonly shown in ETH. Gas prices are commonly quoted in Gwei because a value such as 2 Gwei is easier to read than 0.000000002 ETH. Protocol-level values are frequently represented in Wei so software can work with integers. The unit beside a number is therefore part of the value and should be checked before copying it into another interface.
| Unit | Value in Wei | Example |
|---|---|---|
| ETH | 1,000,000,000,000,000,000 | 0.000000001 ETH = 1 Gwei |
| Gwei | 1,000,000,000 | 2.5 Gwei = 2,500,000,000 Wei |
| Wei | 1 | 123,456,789 Wei = 0.123456789 Gwei |
Wei and Gwei describe denomination scales, not the network or native asset by themselves. This converter uses ETH as the whole-unit label. Another EVM-compatible network may use the same decimal scale while charging fees in its own native asset, so confirm both the network and the asset label before reusing a converted value.
Why a Fraction of Wei Fails
An amount of 0.000000000000000001 ETH equals exactly 1 Wei. Add one more decimal place and 0.0000000000000000001 ETH equals 0.1 Wei. The second value is valid decimal notation, but it cannot be represented as a whole number of Wei, so the converter rejects it instead of rounding it to zero or one.
The same boundary applies in Gwei. Nine decimal places in Gwei reach one Wei, so 0.000000001 Gwei is accepted and 0.0000000001 Gwei is rejected. Wei input itself must be an integer. Trailing zeros do not create a fractional value: 1.000000000 Gwei still equals exactly 1 Gwei because the extra written digits are zero.
Format checks are separate from precision checks. Correct grouping such as 1,000,000 is accepted, while malformed grouping such as 10,00 remains visible for correction. Negative values and exponent notation such as 1e-9 are rejected because this tool expects a non-negative decimal amount written in full. No error path silently changes the submitted value.
How Exact Ethereum Unit Conversion Works
The converter does not use ordinary floating-point arithmetic for the denomination step. It reads the entered decimal as text, validates its grouping and precision, and builds one integer Wei value. ETH and Gwei outputs are then formatted from that integer, avoiding the small binary approximations that can appear when decimal values are handled as floating-point numbers.
Read the decimal text
The amount remains text while the converter checks commas, decimal points, length and the precision allowed by the selected unit. This keeps the exact submitted digits available through validation.
Build one integer Wei amount
ETH uses a scale of 10^18 Wei, Gwei uses 10^9 Wei and Wei uses 1. The normalized digits are applied to that integer scale only when the amount resolves without a remainder.
Format every equivalent together
All three displays come from the same whole-Wei value. Insignificant trailing zeros are removed and grouping commas are added for reading, while Copy result returns ungrouped numeric text.
Check a reverse conversion
Swap carries the exact destination value back to the source side. Repeated swaps preserve the integer Wei amount rather than passing through an approximate intermediate value.
- Read and validate the decimal text
- Resolve one whole-Wei integer
- Format ETH, Gwei and Wei equivalents
- Copy or reverse-check the exact result
Worked ETH, Gwei and Wei Conversions
Each example below resolves through a whole number of Wei. The calculation shows the fixed scale used by the selected source unit; the displayed equivalents are not based on ETH price or current network conditions.
| From | Calculation | Result | What to notice |
|---|---|---|---|
| 1 ETH | 1 × 10^18 | 1,000,000,000 Gwei | One ETH also equals 10^18 Wei. |
| 1 Gwei | 1 × 10^9 | 1,000,000,000 Wei | Gwei has nine decimal places to Wei. |
| 2.5 Gwei | 2.5 × 10^9 | 2,500,000,000 Wei | The same amount is 0.0000000025 ETH. |
| 123,456,789 Wei | 123,456,789 ÷ 10^9 | 0.123456789 Gwei | Every Wei remains visible. |
| 1 Wei | 1 ÷ 10^18 | 0.000000000000000001 ETH | This is the smallest accepted whole amount. |
| 0.0000000001 Gwei | × 10^9 | 0.1 Wei — rejected | No whole-Wei result exists. |
Match the destination unit to the field receiving the result. If an interface asks for a gas price in Gwei, copying a Wei value without its label can create a billion-fold mistake. The All equivalents row provides a quick cross-check before the value leaves this page.
This converter validates representation, not whether a value is sensible for a particular transaction. A large integer may be mathematically convertible while still being inappropriate for a wallet, contract call or gas setting. Verify the purpose and unit in the destination interface.
Gwei, Gas Price and Total Gas Fees
Gwei is an ether denomination. Ethereum interfaces commonly use it to display a price per unit of gas, but a Gwei amount by itself is not a complete transaction fee. A total fee depends on the gas used and the effective price paid per gas. Converting 20 Gwei to ETH only changes the denomination of that number; it does not determine how much gas a transaction will consume.
For example, a displayed gas price of 2 Gwei means 2,000,000,000 Wei per gas unit. The final fee still requires the transaction’s gas usage. Base fee, priority fee, fee caps and execution behavior belong to gas estimation, not fixed denomination conversion. This page intentionally does not fetch live fee conditions or predict a transaction cost.
Use this converter when the task is moving an exact value among ETH, Gwei and Wei. Use a dedicated gas tool when the task includes gas used, base fee, priority fee or a total fee estimate. Other fixed-unit utilities are listed in the Converters directory; Bitcoin denominations remain separate in the Satoshi Converter.
ETH, Gwei and Wei Converter FAQ
How many Gwei are in one ETH?
One ETH equals exactly 1,000,000,000 Gwei. The ratio is fixed and does not depend on Ethereum network demand or ETH price.
How many Wei are in one ETH?
One ETH equals exactly 1,000,000,000,000,000,000 Wei, or 10^18 Wei.
How do I convert Gwei to ETH?
Select Gwei as the From unit and ETH as the To unit. The converter divides the whole-Wei value by 10^18; for example, 2.5 Gwei becomes 0.0000000025 ETH.
Why is fractional Wei rejected?
Wei is the smallest whole denomination supported by this converter. A value that resolves to part of a Wei cannot be represented exactly and is rejected without rounding.
Does this converter calculate Ethereum gas fees?
No. It converts fixed denominations only. A total gas fee also needs gas usage and the effective price paid per gas.
Does the converter use the live ETH price?
No. ETH, Gwei and Wei ratios are fixed. Market price is not needed for denomination conversion.
Does copying a result include commas?
No. Results are grouped on screen for readability, but Copy result uses ungrouped numeric text for safer entry into another field.
Methodology and Sources
The converter applies fixed Ether denomination ratios and resolves every accepted amount through one integer Wei value. Browser calculations and the server fallback use matching decimal-string rules. No live market, wallet or gas data is requested.
- Input is validated as decimal text before arithmetic.
- Every accepted amount must resolve to a whole Wei.
- ETH, Gwei and Wei outputs come from the same integer value.
- Fractional-Wei values are rejected without silent rounding.
Primary references
- Ethereum.org — Ether denomination units Documents Wei as the smallest ether denomination and the fixed relationships among Wei, Gwei and ETH.
- Ethereum.org — Gas and fees Explains gas price units and the separate inputs required to determine a total Ethereum transaction fee.
Reviewed by the BitcoinToolkit Editorial Team Conversion logic last tested