Hästkraftskalkylator

Calculate horsepower from torque and RPM, find torque from HP, or convert between HP, kW, and watts. Free, fast, and easy to use.

Kalkylera

Choose a calculation type, enter your values, and click Calculate Now to get instant results with step-by-step solutions.

Komplett användarhandbok

Vad är hästkrafter?

Horsepower (HP) is a unit of power that measures the rate at which work is done. It was defined by James Watt to compare steam engines with draft horses. One mechanical horsepower equals 745.7 watts or 0.7457 kilowatts. Horsepower is the standard power rating for car engines, electric motors, and industrial machinery worldwide.

All Formulas at a Glance

HP from Torque: HP = (Torque × RPM) / 5252

Torque from HP: Torque = (HP × 5252) / RPM

RPM from HP: RPM = (HP × 5252) / Torque

Konverteringar: 1 HP = 745.7 W = 0.7457 kW

4 Calculation Types

HP från Torque & RPM

Den vanligaste motoreffektberäkningen. Ange vridmoment (ft-lb eller N·m) och RPM.

Vridmoment från HP & RPM

Ta reda på hur mycket vridmoment en motor producerar vid ett givet hk och varvtal.

RPM från HP & Torque

Hitta det varvtal vid vilket en motor producerar toppeffekt för ett givet vridmoment.

Konvertera kraftenheter

Convert between horsepower (HP), kilowatts (kW), and watts (W).

Hur man använder den här kalkylatorn

  1. Pick a calculation type — HP from torque, torque from HP, RPM from HP, or power conversion.
  2. Enter torque in foot-pounds (ft-lb) or Newton-meters (N·m) as needed.
  3. Ange RPM eller hästkrafter beroende på läge.
  4. Click Calculate Now and see instant results with step-by-step breakdown and chart.

Varför 5252?

The constant 5252 comes from unit conversions. One horsepower is 550 ft-lb per second. To go from RPM to radians per minute: (550 × 60) / (2π) ≈ 5252. This means horsepower and torque curves always cross at 5252 RPM when plotted on the same graph.

Key Conversion Factors

• 1 HP = 745,7 Watt = 0,7457 kW

• 1 kW = 1 341 hk = 1 000 watt

• 1 ft-lb = 1,3558 N·m

• 1 N·m = 0,7376 ft-lb

Quick Examples

• 300 ft-lb vid 5252 RPM → (300 × 5252) / 5252 = 300 HP

• 200 HP vid 6000 RPM → (200 × 5252) / 6000 = 175,07 ft-lb

• 150 hk = 111,86 kW = 111 855 W

Viktiga anmärkningar

  • Alla vridmoment och effektvärden måste vara större än noll.
  • HP = (Torque × RPM) / 5252 applies only to rotational power in imperial units.
  • Newton-meter inputs are automatically converted to ft-lb for the formula.
  • Dessa är värden för mekaniska (broms) hästkrafter. Andra HP-definitioner finns (metrisk HP, elektrisk HP).

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