{"id":15581,"date":"2025-05-27T11:00:00","date_gmt":"2025-05-27T11:00:00","guid":{"rendered":"https:\/\/hederav2stg.wpenginepowered.com\/blog\/estimate-gas-dynamically\/"},"modified":"2025-12-08T18:06:41","modified_gmt":"2025-12-08T18:06:41","slug":"estimate-gas-dynamically","status":"publish","type":"post","link":"https:\/\/hedera.com\/blog\/estimate-gas-dynamically\/","title":{"rendered":"Estimate Gas Dynamically: Best Practices for Smart Contract Development"},"content":{"rendered":"<div class=\"body-text BodyCopy mb-40 style-1\">\n<p dir=\"ltr\">Gas is the fuel of smart contract computations, and underestimating it can bring your dApp to a halt. Locking in a hardcoded gas limit might get you across the finish line once (or a few times), but as your contracts grow or conditions shift, that same fixed value can cause unexpected failures in the future.<\/p>\n<p dir=\"ltr\">This article covers why hardcoded gas limits are fragile, how to use dynamic estimation with common EVM tools, practical tips like adding buffers and retry logic, and specific guidance for developers using both JSON-RPC and HAPI (Hedera API).<\/p>\n<h4 class=\"color-ultraviolet\" dir=\"ltr\"><strong>Why Hardcoded Gas Limits Break<\/strong><\/h4>\n<p dir=\"ltr\">Hardcoding a gas limit is like flying blind. You are guessing how much fuel you\u2019ll need without checking the conditions. If your guess is too low, the transaction hits the gas ceiling and fails, resulting in wasted gas fees without achieving the intended outcome. Even if the hardcoded values worked once, changes in network state or contract logic can turn a \u201csafe\u201d limit into a silent failure point. To make things more specific, some protocol upgrades (e.g., <a href=\"https:\/\/eips.ethereum.org\/EIPS\/eip-1884\">Ethereum\u2019s EIP-1884<\/a>) can reprice operations, breaking code that assumed a fixed gas amount.<\/p>\n<p dir=\"ltr\">Rather than hoping a constant value remains valid, it\u2019s best to <strong>estimate gas needs at runtime<\/strong>.<\/p>\n<h4 class=\"color-ultraviolet\" dir=\"ltr\"><strong>Use Dynamic Gas Estimation Tools<\/strong><\/h4>\n<p dir=\"ltr\">By &#8220;asking&#8221; the network first, you avoid flying blind and get a reliable baseline for each transaction. EVM tooling makes dynamic gas estimation simple. For instance:<\/p>\n<ul>\n<li dir=\"ltr\">\n<p dir=\"ltr\"><strong>Hardhat &amp; Ethers.js<\/strong>: Default to<strong> <em>gas: &#8220;auto&#8221;<\/em>,<\/strong> which calls <strong><em>estimateGas()<\/em><\/strong> and applies an optional multiplier (<strong><em>gasMultiplier<\/em><\/strong>).<\/p>\n<\/li>\n<li dir=\"ltr\">\n<p dir=\"ltr\"><strong>Web3.js<\/strong>: Use <strong><em>web3.eth.estimateGas(txParams)<\/em><\/strong> to simulate and return the expected gas usage.<\/p>\n<\/li>\n<li dir=\"ltr\">\n<p dir=\"ltr\"><strong>Remix IDE<\/strong>: Estimates gas for you in the UI when you run transactions. Just click the gas field and let it fill in.<\/p>\n<\/li>\n<\/ul>\n<h4 class=\"color-ultraviolet\" dir=\"ltr\"><strong>Practical Tips: Buffers &amp; Retry Logic<\/strong><\/h4>\n<p dir=\"ltr\">Consider the following steps for resilient deployments:<\/p>\n<ol>\n<li dir=\"ltr\">\n<p dir=\"ltr\"><strong>Estimate First<\/strong>: Always call <strong><em>estimateGas()<\/em><\/strong> (or let your framework do it for you).<\/p>\n<\/li>\n<li dir=\"ltr\">\n<p dir=\"ltr\"><strong>Add a Safety Buffer<\/strong>: Add ~20\u201325% extra to cover state changes or estimation variance (e.g, <strong><em>gasMultiplier: 1.2<\/em><\/strong> with Hardhat and Ethers.js). On Hedera, up to 20% of unused gas is refunded, so you pay for at least 80% of the gas limit you specify. This incentivizes accurate gas estimates.<\/p>\n<\/li>\n<li dir=\"ltr\">\n<p dir=\"ltr\"><strong>Implement Retry Logic<\/strong>: Catch out-of-gas errors, log them, and retry with a higher limit (e.g., increase by another 20%). A couple of retries usually result in a successful transaction.<\/p>\n<\/li>\n<li dir=\"ltr\">\n<p dir=\"ltr\"><strong>Monitor and adjust<\/strong>: Track the actual gas used in production, then tweak your buffer or estimation strategy as your contracts evolve.<\/p>\n<\/li>\n<\/ol>\n<p dir=\"ltr\">Estimates may not always be perfect, but this approach helps avoid surprises in your application with out-of-gas failures.<\/p>\n<h4 class=\"color-ultraviolet\" dir=\"ltr\"><strong>Working with JSON-RPC &amp; HAPI on Hedera<\/strong><\/h4>\n<p dir=\"ltr\">Hedera is <strong>EVM-compatible<\/strong> and <strong>open source<\/strong>, so you can use standard EVM tools that you&#8217;re already familiar with.<\/p>\n<ul>\n<li dir=\"ltr\">\n<p dir=\"ltr\"><strong>JSON-RPC<\/strong>: Call <strong><em>eth_estimateGas<\/em><\/strong> against the appropriate JSON-RPC endpoint\u00a0to get accurate numbers. Then apply your buffer and send the transaction via Ethers.js, Hardhat, Web3.js, etc. See an example here:\u00a0<a href=\"https:\/\/github.com\/ed-marquez\/hedera-example-eth-call-estimategas-hip584\" target=\"_blank\">https:\/\/github.com\/ed-marquez\/hedera-example-eth-call-estimategas-hip584<\/a><\/p>\n<\/li>\n<\/ul>\n<p dir=\"ltr\">Hedera offers capabilities beyond the EVM, so it provides SDKs in JavaScript, Java, Go, Rust, and other languages for developers who want to incorporate web3 components in their applications without having to learn or code smart contracts.<\/p>\n<ul>\n<li dir=\"ltr\">\n<p dir=\"ltr\">When using the Hedera SDK, it includes <strong>MirrorNodeContractEstimateQuery<\/strong>, which leverages the Mirror Node\u2019s \/contracts\/call endpoint to estimate gas. See the example here:<br \/><a href=\"https:\/\/github.com\/hiero-ledger\/hiero-sdk-js\/blob\/main\/examples\/mirror-node-contract-queries-example.js#L55\"> https:\/\/github.com\/hiero-ledger\/hiero-sdk-js\/blob\/main\/examples\/mirror-node-contract-queries-example.js#L55<\/a><\/p>\n<\/li>\n<li dir=\"ltr\">\n<p dir=\"ltr\">You can also call the <a href=\"https:\/\/docs.hedera.com\/hedera\/sdks-and-apis\/rest-api\/smart-contracts#post-api-v1-contracts-call\">Mirror Node REST API directly<\/a>: POST \/api\/v1\/contracts\/call to simulate and return gas usage.<\/p>\n<\/li>\n<\/ul>\n<p>Keep in mind that you can observe the Gas Limit, Gas Used, and Gas Consumed in the <a href=\"https:\/\/hashscan.io\/mainnet\/transaction\/1748184892.988730000\">Contract Results section of a transaction on HashScan<\/a>. Alternatively, you can use contractCallResult.gasUsed in the SDK.<\/p>\n<\/div>\n<figure class=\"blog-image mb-40\"><img decoding=\"async\" src=\"https:\/\/hedera.com\/wp-content\/uploads\/2025\/12\/Gas-HashScan-scaled.png\" alt=\"\"\/><\/figure>\n<div class=\"body-text BodyCopy mb-40 style-1\">\n<h4 class=\"color-ultraviolet\" dir=\"ltr\"><strong>In Summary&#8230;<\/strong><\/h4>\n<p dir=\"ltr\">Hardcoding gas limits sets you up for brittle, failure-prone deployments. The optimal approach, which applies to all EVM networks, is to estimate dynamically, apply a buffer, and build in a safety net. Use tools like Hardhat, Remix, or Web3.js to call eth_estimateGas and add a 20\u201325% buffer to stay ahead of shifting network conditions. When using HAPI on Hedera, you can accurately estimate gas using the MirrorNodeContractEstimateQuery via the SDK or by directly calling the \/contracts\/call endpoint of the <a href=\"https:\/\/docs.hedera.com\/hedera\/sdks-and-apis\/rest-api\">Mirror Node REST API<\/a>.<\/p>\n<p dir=\"ltr\">These best practices not only prevent costly failures but also future-proof your dApps as they evolve and scale. Whether you&#8217;re building with smart contracts on Hedera or another EVM chain, dynamic gas estimation leads to more reliable contract execution. <\/p>\n<h4 class=\"color-ultraviolet\" dir=\"ltr\"><strong>Ready to put it into practice?<\/strong><\/h4>\n<p dir=\"ltr\">Try deploying your contract on Hedera in seconds with the<a href=\"https:\/\/portal.hedera.com\/contract-builder\"> Hedera Contract Builder<\/a>. Be sure to join the <a href=\"http:\/\/hedera.com\/discord\">Hedera Discord server<\/a> to stay in touch with experts and the community!<\/p>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Learn why hardcoded gas limits are fragile, how to use dynamic estimation with common EVM tools, practical tips like adding buffers and retry logic, and specific guidance for developers using both JSON-RPC and HAPI.<\/p>\n","protected":false},"author":10,"featured_media":16668,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"content-type":"","footnotes":""},"categories":[1],"tags":[45],"ppma_author":[43],"class_list":["post-15581","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-uncategorized","tag-technical"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.9 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Estimate Gas 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