TPS, or Transactions Per Second, is a very important metric for the blockchain sector, which is useful in determining how many transactions a blockchain network can process and confirm per second.
TPS is one of the leading on-chain metrics in order to check the blockchain’s speed, scalability, and overall performance. It is often compared to traditional payment networks like Visa, which can handle tens of thousands of transactions per second.
What Is TPS?
TPS measures how much data a blockchain can handle per second. However, not all TPS figures are the same. There are two different ways to measure it, and they give different data.
- Real-time TPS – This metric shows the actual activity happening on the live blockchain network at any given time.
- Theoretical (or maximum) TPS – This is the TPS that gives the picture of the highest possible speed the blockchain network could reach under perfect conditions.
Both types of TPS are important to understand because many blockchains promote themselves based on theoretical numbers, while real-world Transactions Per Second is all that matters in the blockchain sector, which can decide the network’s adoption.
How Is TPS Calculated?
There are two different ways to calculate TPS.
1. Real-time TPS
TPS = T/t
(T: Total number of completed transactions; t: Total time taken in seconds)
Real-time TPS takes the feed of on-chain data from recent blocks within a specific interval of time, such as the last hour. Also, it only considers those transactions that were successfully processed and received approvals from validators. This kind of Transactions Per Second metric can fluctuate based on the blockchain network’s demand, congestion, and the complexity of the transactions.
2. Maximum Theoretical TPS
Max theoretical TPS = (max block size) ÷ (min transaction size * block time)
This equation is tricky as it already assumes that the blockchain is in perfect condition, such as every transaction is the smallest possible size, the network runs at full capacity with no failures or extra overhead, and blocks are produced as fast as possible.
Let’s try to understand this through an example based on the Ethereum blockchain.
Ethereum’s maximum block gas limit is currently 60,000,000 gas, raised from 30 million during the Fusaka upgrade in late 2025. The normal transaction of a token uses approximately 21,000 gas. With an average block time of around 12 seconds, the equation works out like this:
60,000,000 ÷ 21,000 ÷ 12 ≈ 238 TPS
In reality, Ethereum’s real-time TPS currently runs around 36 TPS, with a max recorded TPS of roughly 75 during peak activity. This is because every transaction has a different complexity linked to it. For example, smart contract interactions can consume more gas than simple transfers.
Real-Time TPS vs. Theoretical TPS vs. Max Recorded TPS
| TPS Type | What It Measures | Best Used For |
|---|---|---|
| Real-time TPS | Current live network throughput | Gauging current adoption/activity |
| Max theoretical TPS | Hypothetical ceiling under perfect conditions | Comparing architectural potential |
| Max recorded TPS | Highest throughput actually observed under peak load | Assessing real-world scalability |
Real-time TPS shows how the network is actually working on a daily basis with real conditions, different types of transactions, and a fluctuating volume of transactions.
On the other hand, theoretical TPS is important to help measure the network’s design. For example, Solana is capable of processing transactions in parallel to reach extremely high limits.
Max recorded TPS captures the highest throughput a network has actually hit under peak load. Ethereum’s max recorded TPS sits at roughly 75 — well above its everyday real-time average — showing how much headroom the network has during traffic spikes.
Why the Same Chain Shows Different TPS Numbers on Different Sites
TPS numbers can vary across different explorers, dashboards, and news articles because they use different methods to calculate them. While some trackers are considering successfully executed and user-initiated transactions, others are using internal contract calls, system transactions, and sometimes, it includes failed attempts.
Apart from this, the input of data also matters, as some measure short windows during high activity on the blockchain network, while other platforms use daily averages.
There are some reputed analytics platforms like Chainspect that keep their method transparent by clearly explaining their methodology. Most of these platforms only count valid transactions along with a clear timeframe. This allows users to avoid inflated or inaccurate figures for TPS.
TPS and the Blockchain Trilemma
TPS is the main metric of the popular blockchain trilemma, which is about creating the right balance between fast transactions, strong security, and decentralization. There are popular blockchain networks like Bitcoin and Ethereum that put factors like security and decentralization as their priority. However, this often results in lower TPS.
On the flip side, high-TPS blockchain networks can achieve speed through different kinds of consensus mechanisms, larger block sizes, or parallel processing methods. However, sometimes it costs decentralization by introducing trade-offs in how finality and security work.
Blockchains like Ethereum are getting support from Layer-2 solutions and modular architectures, which are helping older chains to improve their TPS without giving up their core properties like decentralization.
Conclusion
Transactions Per Second is a very useful on-chain metric, though it is also tricky, as it is used to measure the speed of the blockchain. While blockchain networks use theoretical numbers as a marketing strategy, real-time and recorded TPS reveal how a network performs in real conditions. Understanding TPS is an important step toward evaluating blockchain performance. To continue learning such terminology, browse our complete glossary section, which explains essential crypto concepts in simple language.
