🏎️ 马力计算器Horsepower Calculator
由扭矩和转速计算马力（hp = 扭矩(lb·ft) × rpm ÷ 5252），或用车重与 1/4 英里成绩（ET 或出口速度）估算发动机马力，同时换算千瓦和公制马力（PS）。Calculate horsepower from torque and RPM (hp = lb·ft × rpm ÷ 5252), or estimate it from vehicle weight and quarter-mile ET or trap speed, with kW and metric PS.
使用说明与常见问题How-to & FAQ
「马力计算器」是什么？What is the Horsepower Calculator tool?
由扭矩和转速计算马力（hp = 扭矩(lb·ft) × rpm ÷ 5252），或用车重与 1/4 英里成绩（ET 或出口速度）估算发动机马力，同时换算千瓦和公制马力（PS）。Calculate horsepower from torque and RPM (hp = lb·ft × rpm ÷ 5252), or estimate it from vehicle weight and quarter-mile ET or trap speed, with kW and metric PS.
如何使用「马力计算器」？How do I use the Horsepower Calculator tool?
在「马力计算器」中，填写「计算方式」、「扭矩」、「扭矩单位」、「转速 rpm」、「车重（磅，含驾驶员）」等参数，结果会随输入实时计算并显示在下方。In the Horsepower Calculator: Fill in "Method", "Torque", "Torque unit", "RPM", "Weight (lb, with driver)"; results are recalculated instantly as you type.
为什么是 5252？Why 5252?
1 马力 = 33,000 磅·英尺/分钟。功率 = 扭矩 × 角速度 = 扭矩 × 2π × rpm，因此 hp = 扭矩 × rpm × 2π ÷ 33,000 = 扭矩 × rpm ÷ 5252.11。所以任何发动机的扭矩曲线和马力曲线都在 5252 rpm 处相交。1 hp = 33,000 lb·ft per minute. Power = torque × angular speed = torque × 2π × rpm, so hp = torque × rpm × 2π ÷ 33,000 = torque × rpm ÷ 5252.11 — which is why torque and hp curves cross at 5252 rpm.
用 1/4 英里成绩怎么估算？How does the quarter-mile estimate work?
使用常见经验公式：按 ET（秒）hp ≈ 车重 × (5.825 ÷ ET)³；按出口速度（mph）hp ≈ 车重 × (速度 ÷ 234)³。车重以磅计并包含驾驶员。出口速度法受起步和牵引力影响更小，通常更可靠。Common empirical formulas: from ET (seconds) hp ≈ weight × (5.825 ÷ ET)³; from trap speed (mph) hp ≈ weight × (speed ÷ 234)³, with weight in pounds including the driver. Trap speed is less affected by launch and traction, so it is usually more reliable.
hp、kW 和 PS 怎么换算？How do hp, kW and PS relate?
1 hp（英制机械马力）= 745.7 W = 0.7457 kW；1 PS（公制马力）= 735.5 W；所以 1 hp ≈ 1.0139 PS。国内车型参数常用 kW 或“匹”（即 PS）。1 mechanical hp = 745.7 W = 0.7457 kW; 1 metric PS = 735.5 W, so 1 hp ≈ 1.0139 PS. Many European and Asian specs quote kW or PS.
计算结果可以作为最终依据吗？Can I rely on the result?
「马力计算器」按标准公式计算，结果仅供参考；实际金额以银行、券商或税务机关的规则和四舍五入方式为准。The Horsepower Calculator uses standard formulas and is for estimation only; actual figures depend on your bank, broker or tax authority's rules and rounding.
「马力计算器」免费吗？需要注册吗？Is the Horsepower Calculator free? Do I need an account?
「马力计算器」完全免费，无需注册或安装，打开网页即可使用，手机和电脑都能用；输入的内容只在你的浏览器本地处理。The Horsepower Calculator is completely free with no sign-up or install and works on phones and desktops; what you enter is processed only in your browser.