马力计算器
计算引擎马力 由托盘和RPM计算 或估计四分之一英里的捕捉速度
输入结果时更新 。
关于此计算器
Horsepower measures the rate of doing work, and this horsepower calculator finds it two ways. In the first mode, engine power follows directly from torque and rotational speed: HP = torque (lb-ft) × RPM ÷ 5252. The magic number 5,252 comes from the definition of horsepower (33,000 ft-lb per minute) and the 2π radians in a revolution, and it is also the RPM at which the horsepower and torque curves always intersect on a dyno chart. The tool reports the metric equivalent too, using 1 hp = 0.7457 kW.
As a worked example, an engine making 300 lb-ft of torque at 5,000 RPM produces 300 × 5000 ÷ 5252 ≈ 286 hp, which is about 213 kW. Because power is torque times speed, the same 300 lb-ft makes far more horsepower at high RPM than at low — which is why high-revving engines chase big peak-power figures even with modest torque.
Switch to the quarter-mile mode to estimate drag-strip performance from power and vehicle weight using Roger Huntington’s classic empirical formulas: trap speed ≈ 234 × (hp / weight)^⅓ mph and elapsed time ≈ 5.825 × (weight / hp)^⅓ seconds. A 300 hp car weighing 3,500 lb comes out around 103 mph and a 13.2-second quarter mile. These are rough guides that ignore traction, aerodynamics and driver skill, but they are a quick sanity check for a build or a way to back out power from a known trap speed.
经常问到的问题
为什么5252在马力配方?
马力定义为每分钟33 000立方英尺, 一次革命将2°+弧度扫荡。 组合常数会给 HP = 托克 × RPM = 52.52, 这也是马力和托克曲线总是在 52.52 RPM 的 音响图上交叉的原因。
如何估计马力 以四分之一英里?
罗杰·亨廷顿的公式将捕捉速度和重量与力量连接:捕捉速度 = 234 × (hp/ weight) =1⁄3 mph。计算器将它倒转,以估计捕捉速度和从你的能量和重量中流出的时间,这是一条粗略的指南,忽略了牵引和空气动力学。
有多少瓦是一匹马的力量?
One mechanical horsepower is about 745.7 watts, so 300 hp is roughly 224 kW. The calculator shows the kilowatt equivalent alongside horsepower.
为什么同样的手法在不同的RPM 赋予不同的马力?
Because power is torque times rotational speed. HP = torque × RPM ÷ 5252, so 300 lb-ft makes about 286 hp at 5,000 RPM but only 143 hp at 2,500 RPM — the reason engines are revved to reach peak power.
快速四分之一英里的电力对重量比率是多少?
Trap speed scales with the cube root of horsepower per pound, so weight matters as much as power. Around 0.1 hp per pound (a 350 hp, 3,500 lb car) puts you near 110 mph traps; shedding weight helps just as much as adding power.
我能用我的陷阱速度估计马力吗?
四分之一英里的计算模式运行亨廷顿的公式,从功率和重量到陷阱速度和ET。 要换个方向,调整马力输入,直到预测的陷阱速度与你测得的速度一致 — — 马力是粗略的估计。
四分之一英里的估计数准确吗?
它们是球场数字。 Huntington的公式忽略了牵引力、空气动力学、齿轮、发射技术和驱动器损失,因此,真正的汽车可以乘以十分之一的秒。 把它们当作向导,而不是时间运行的替代物。
API - 使用代码中的计算器
将此计算器称为自由 JSON 端点 。 不需要按键 。 将字段值发送到下面作为查询参数或 JSON 。 任何您省略的, 都会使用相同的默认值, 此页面预填的默认值是预填的; 未知参数是 400, 而不是静音零 。 读取 API 全部文件 →
终点
GET https://calculator.free/api/v1/horsepower/curl
curl "https://calculator.free/api/v1/horsepower/?torque=300&rpm=5000&hp=300&weight=3500&_mode=power"JavaScript fetch()
const r = await fetch(
"https://calculator.free/api/v1/horsepower/?" + new URLSearchParams({
"torque": "300",
"rpm": "5000",
"hp": "300",
"weight": "3500",
"_mode": "power"
}));
const data = await r.json();
console.log(data.results);成果仅是一般指导的估计数,而不是财务、医疗或税务咨询。