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Calcimator

Horsepower Calculator

Calculate engine horsepower from torque and RPM or estimate HP from quarter mile time and vehicle weight. Convert between HP, kW, and metric horsepower.

Inputs

lb-ft
RPM

Results

Horsepower (SAE)

366.5 HP

Kilowatts273.3 kW
Metric Horsepower371.6 PS
BTU per Hour932,602
Torque Estimate350 lb-ft
Formula UsedHP = (Torque × RPM) / 5252

Horsepower (SAE)

366.5 HP

How to Use This Calculator
  1. Start by filling in the input fields below. Results update instantly as you type, so you can experiment with different values to see how they affect the outcome.
  2. Calculation Method — Type of calculation to perform. Choose from: From Torque & RPM, From Quarter Mile. default: 1.
  3. Torque — Engine torque in pound-feet Accepts values from 0 lb-ft to 5,000 lb-ft (default: 350 lb-ft).
  4. Engine RPM — Engine speed at peak torque Accepts values from 0 RPM to 20,000 RPM (default: 5,500 RPM).
  5. Vehicle Weight — Total weight including driver Accepts values from 500 lbs to 10,000 lbs (default: 3,500 lbs).
  6. Quarter Mile Time — Elapsed time for 1/4 mile Accepts values from 5 seconds to 30 seconds (default: 12.5 seconds).
  7. Once all inputs are set, review your results in the Results panel. Here's what each output means:
  8. Horsepower (SAE) — shown as a numeric value. This is the primary result of this calculator.
  9. Kilowatts — shown as a numeric value.
  10. Metric Horsepower — shown as a numeric value.
  11. BTU per Hour — shown as a numeric value.
  12. Torque Estimate — shown as a numeric value.
  13. Formula Used — your calculated result.
  14. View the Power Comparison below for a visual breakdown of how the numbers relate to each other.
  15. Explore the related calculators below if you need deeper analysis or want to approach this topic from a different angle.
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