The latest articles on DEV Community by luckyuan wang (@luckyuan_wang_310c630db0b). https://dev.to/luckyuan_wang_310c630db0b https://media2.dev.to/dynamic/image/width=90,height=90,fit=cover,gravity=auto,format=auto/https:%2F%2Fdev-to-uploads.s3.amazonaws.com%2Fuploads%2Fuser%2Fprofile_image%2F3980400%2F3d5a278b-d36c-4db7-803b-ce1169296dd6.jpg https://dev.to/luckyuan_wang_310c630db0b en luckyuan wang Fri, 12 Jun 2026 02:59:01 +0000 https://dev.to/luckyuan_wang_310c630db0b/how-i-built-a-free-gemini-api-cost-calculator-and-why-you-need-one-2ch7 https://dev.to/luckyuan_wang_310c630db0b/how-i-built-a-free-gemini-api-cost-calculator-and-why-you-need-one-2ch7 <p>If you're building with Google's Gemini API, you've probably asked yourself:</p> <blockquote> <p>"How much is this actually going to cost me per month?"</p> </blockquote> <p>The official pricing page gives you per-token rates, but calculating real-world costs — with different models, batch vs standard pricing, and monthly volume — is a headache. So I built a free tool to solve it.</p> <h2> What It Does </h2> <p>🔗 <strong><a href="https://gemini-cost-calculator.vercel.app/" rel="noopener noreferrer">Gemini API Cost Calculator</a></strong></p> <ul> <li> <strong>All Gemini models</strong> — 2.5 Flash, 3.5 Flash, 2.5 Pro, Flash-Lite, and legacy models</li> <li> <strong>3 pricing tiers</strong> — Standard, Batch (50% cheaper), and Priority</li> <li> <strong>Cross-provider comparison</strong> — Stack Gemini against GPT-4o, Claude, and more</li> <li> <strong>Monthly cost projection</strong> — Enter your expected volume, get a dollar amount instantly</li> <li> <strong>Free tier info</strong> — See which models offer free daily quotas</li> </ul> <h2> Quick Example </h2> <p>Running 100K requests/month with 1K input + 500 output tokens per request:</p> <div class="table-wrapper-paragraph"><table> <thead> <tr> <th>Model</th> <th>Monthly Cost</th> </tr> </thead> <tbody> <tr> <td>Gemini 2.5 Flash-Lite</td> <td>~$4.50</td> </tr> <tr> <td>Gemini 2.5 Flash</td> <td>~$28</td> </tr> <tr> <td>GPT-4o Mini</td> <td>~$22</td> </tr> <tr> <td>GPT-4o</td> <td>~$225</td> </tr> </tbody> </table></div> <p>The cheapest Gemini model costs less than a coffee per month at moderate scale.</p> <h2> Why I Built It </h2> <p>I've been building AI tools and the first question every time is "what's the bill going to look like?" No calculator I found supported all Gemini models with batch pricing. So I built one.</p> <p>It's 100% free, no signup, no tracking. Just a tool I wanted to exist.</p> <p>Feedback welcome! What features would you add?</p> ai api gemini showdev