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免费在线工具汇集了 154 个快速、专注的计算器、转换器和实用工具。从燃油费用、油漆估算和欧姆定律，到游戏助手、URL 编码、公网 IP 查询等等。

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Built in Brisbane by Ethan & Tony

Free Online Tools is a father-and-son project from Queensland, Australia. We build calculators we actually use, fuel and towing maths, electrical helpers, converters, and everyday utilities, then add clear how-to notes so the page is useful even before you hit calculate.

Every public tool is maintained by us. Thin stubs, unfinished experiments, and policy-risky pages are kept offline. Prefer to know who runs the site? Read About, our Articles, or get in touch.

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每个类别内按 A, Z 排序，共 154 免费在线工具 个工具。

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今日工具

Solar Panel & Battery Calculator

Estimate solar panel size and battery capacity from daily energy usage, peak sun hours, system voltage and losses for off‑grid and RV setups. Results update in the browser. Guide only — confirm panel, controller and battery manufacturer data.

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