--- title: "#calculator articles | Hashnode" description: "Explore 160 articles tagged #calculator on Hashnode. Tutorials, guides, and how-tos from the community." url: "https://hashnode.com/tag/calculator" --- Tag # #calculator 160 posts · 3 followers [Jazi Tech](https://hashnode.com/@jazitech) · [4d ago](https://hashnode.com/posts/how-long-will-your-solar-battery-last-calculate-it-in-seconds/6aefa996587381542df43e75) ### [How Long Will Your Solar Battery Last? Calculate It in Seconds](https://jazitech.hashnode.dev/how-long-will-your-solar-battery-last-calculate-it-in-seconds?utm_source=hashnode&utm_medium=feed) If you run a home solar setup, you have asked this question: how long will my battery actually last when the power goes out? The answer depends on three numbers — your battery capacity, your load, and 2 min read · [jazitech.hashnode.dev](https://jazitech.hashnode.dev/how-long-will-your-solar-battery-last-calculate-it-in-seconds?utm_source=hashnode&utm_medium=feed) [circuitrocks](https://hashnode.com/@circuitrocks) · [Oct 11](https://hashnode.com/posts/esp32-ai-calculator-v2-reads-your-handwritten-equations/6acb5347bcad41328df798d0) ### [ESP32 AI Calculator V2 Reads Your Handwritten Equations](https://circuitrocks.hashnode.dev/esp32-ai-calculator-v2-reads-your-handwritten-equations?utm_source=hashnode&utm_medium=feed) ESP32 AI Calculator V2: This open source ESP32 calculator has a camera and two displays, so it can read a handwritten equation and solve it with cloud or… 2 min read · [circuitrocks.hashnode.dev](https://circuitrocks.hashnode.dev/esp32-ai-calculator-v2-reads-your-handwritten-equations?utm_source=hashnode&utm_medium=feed) [circuitrocks](https://hashnode.com/@circuitrocks) · [Oct 5](https://hashnode.com/posts/diy-stm32-scientific-calculator-with-a-memory-lcd-and-cr2032-power/6ac3245b9e56afdcaeb15667) ### [DIY STM32 Scientific Calculator With a Memory LCD and CR2032 Power](https://circuitrocks.hashnode.dev/diy-stm32-scientific-calculator-with-a-memory-lcd-and-cr2032-power?utm_source=hashnode&utm_medium=feed) DIY STM32 Scientific Calculator: An STM32L431, a 400x240 Memory LCD and two CR2032 cells make a graphing RPN calculator. 2 min read · [circuitrocks.hashnode.dev](https://circuitrocks.hashnode.dev/diy-stm32-scientific-calculator-with-a-memory-lcd-and-cr2032-power?utm_source=hashnode&utm_medium=feed) [Aditya Sharma](https://hashnode.com/@phoenix1854) · [Sep 6](https://hashnode.com/posts/architecting-a-sub-50ms-web-calculator-across-41-locales-with-astro-5-tailwind-v4/6a9dc748f4e417238182ee16) ### [Architecting a Sub-50ms Web Calculator Across 41 Locales with Astro 5 & Tailwind v4](https://movierecommender.hashnode.dev/architecting-a-sub-50ms-web-calculator-across-41-locales-with-astro-5-tailwind-v4?utm_source=hashnode&utm_medium=feed) How we eliminated framework bloat, achieved 100/100 Core Web Vitals, and automated international SEO on Cloudflare Pages. 6 min read · [movierecommender.hashnode.dev](https://movierecommender.hashnode.dev/architecting-a-sub-50ms-web-calculator-across-41-locales-with-astro-5-tailwind-v4?utm_source=hashnode&utm_medium=feed) [Finance Researcher](https://hashnode.com/@financeresearcher) · [Aug 31](https://hashnode.com/posts/how-to-build-a-loan-payment-calculator-with-javascript/6a951a97e611dad63a7bdb65) ### [How to Build a Loan Payment Calculator With JavaScript](https://easyloanworld-labs.hashnode.dev/how-to-build-a-loan-payment-calculator-with-javascript?utm_source=hashnode&utm_medium=feed) Loan calculators are among the most common tools used across banking, lending, mortgage, auto-finance, and personal-finance websites. 23 min read · [easyloanworld-labs.hashnode.dev](https://easyloanworld-labs.hashnode.dev/how-to-build-a-loan-payment-calculator-with-javascript?utm_source=hashnode&utm_medium=feed) [tomojitjfu](https://hashnode.com/@calculator4u) · [Aug 14](https://hashnode.com/posts/how-i-built-170-free-calculators-solo-key-product-technical-lessons/6a7f2beeb302fe2fe9ff17d3) ### [How I Built 170+ Free Calculators Solo: Key Product & Technical Lessons](https://calculator4u.hashnode.dev/how-i-built-170-free-calculators-solo-key-product-technical-lessons?utm_source=hashnode&utm_medium=feed) When people think about utility software, they often assume it’s simple: input a number, run an equation, return an answer. Over the past few months, I built Calculator4U.app—a platform featuring over 3 min read · [calculator4u.hashnode.dev](https://calculator4u.hashnode.dev/how-i-built-170-free-calculators-solo-key-product-technical-lessons?utm_source=hashnode&utm_medium=feed) [TR-MATE Global](https://hashnode.com/@tr-mate-global) · [Aug 11](https://hashnode.com/posts/building-an-xauusd-profit-calculator-without-false-precision/6a7a9d01af425080ca2914ac) ### [Building an XAUUSD Profit Calculator Without False Precision](https://copi-blog.hashnode.dev/building-an-xauusd-profit-calculator-without-false-precision?utm_source=hashnode&utm_medium=feed) A trading calculator can produce several mathematically correct values from one scenario: price movement, pips, account-currency P/L, required margin, and return on margin. The engineering challenge i 2 min read · [copi-blog.hashnode.dev](https://copi-blog.hashnode.dev/building-an-xauusd-profit-calculator-without-false-precision?utm_source=hashnode&utm_medium=feed) [Waqas Solangi](https://hashnode.com/@globaltools) · [Aug 10](https://hashnode.com/posts/how-to-calculate-a-pregnancy-due-date-with-javascript/6a7a02c700f9d2829d07dd58) ### [How to Calculate a Pregnancy Due Date with JavaScript](https://globaltoolsbox.hashnode.dev/how-to-calculate-a-pregnancy-due-date-with-javascript?utm_source=hashnode&utm_medium=feed) Learn how to build a simple Pregnancy Due Date Calculator with JavaScript using date calculations, validation, and a mobile-friendly interface. 2 min read · [globaltoolsbox.hashnode.dev](https://globaltoolsbox.hashnode.dev/how-to-calculate-a-pregnancy-due-date-with-javascript?utm_source=hashnode&utm_medium=feed) [TR-MATE Global](https://hashnode.com/@tr-mate-global) · [Aug 7](https://hashnode.com/posts/a-variable-result-is-not-enough-designing-an-explainable-swap-calculator/6a759641f8c9d781ee8abe0e) ### [A Variable Result Is Not Enough: Designing an Explainable Swap Calculator](https://copi-blog.hashnode.dev/a-variable-result-is-not-enough-designing-an-explainable-swap-calculator?utm_source=hashnode&utm_medium=feed) How we keep the inputs, charged-night logic, and limits beside an XAUUSD overnight-cost estimate. 1 min read · [copi-blog.hashnode.dev](https://copi-blog.hashnode.dev/a-variable-result-is-not-enough-designing-an-explainable-swap-calculator?utm_source=hashnode&utm_medium=feed) [Viper-cdx](https://hashnode.com/@vipercdx) · [Aug 5](https://hashnode.com/posts/i-built-60-finance-calculators-with-astro-and-react-as-a-solo-dev-here-s-what-i-learned/6a73a1e24ac989c8bc51b0df) ### [I Built 60+ Finance Calculators with Astro and React as a Solo Dev. Here's What I Learned.](https://viper-dev.hashnode.dev/i-built-60-finance-calculators-with-astro-and-react-as-a-solo-dev-here-s-what-i-learned?utm_source=hashnode&utm_medium=feed) I've shipped two calculator platforms: Calcinova for personal finance and Calcademic for students and academics. 4 min read · [viper-dev.hashnode.dev](https://viper-dev.hashnode.dev/i-built-60-finance-calculators-with-astro-and-react-as-a-solo-dev-here-s-what-i-learned?utm_source=hashnode&utm_medium=feed) [1](https://hashnode.com/posts/i-built-60-finance-calculators-with-astro-and-react-as-a-solo-dev-here-s-what-i-learned/6a73a1e24ac989c8bc51b0df)