Engines and Motion
Calculate Horsepower from Torque and RPM
Horsepower
hp
- Power
- kW
- Result
- Torque (metric)
- N·m
- Result
Free calculators, filed by subject
Every calculator on its own card
Find the card, change the numbers, and keep the answer with the formula and a worked example beside it.
- Cards on file
- 84
- Drawers
- 10
- Formula shown
- every card
The ten drawers
Open the cabinet →Exact pairs: mph to ft/s, feet and inches to metres, mil to mm.
- Convert Millimeters to Centimeters and Feet100.00 cm
- Convert mph to fps (Feet per Second)58.667 ft/s
12 cards Open →
Hours, minutes and seconds, work weeks and day counts.
2 cards Open →
Horsepower, torque, rpm, power to weight and kinetic energy.
- Eighth Mile to Quarter Mile Calculator and Formula10.99 s
- Feet per Second to Foot-Pounds Calculator1.55 ft·lbf
7 cards Open →
Capacitors, parallel resistance, kVA and kW, frequency.
- Calculate Video Bandwidth Usage: Formula and Examples2.25 GB
- Capacitor Size Formula: Calculate Capacitance0.000200 F
8 cards Open →
Pressure with elevation, heating energy, mixing and evaporation.
- Atmospheric Pressure by Address Calculator101.33 kPa
- Atmospheric Pressure by Elevation: Formula and Calculator89.87 kPa
15 cards Open →
Powers, e, logarithms, fractions, floating point, standard error.
- Angle Calculator: Elevation, Distance and Height
- Angle of Depression Calculator and Formula26.57 degrees
8 cards Open →
Moles, atomic mass units, reaction rates, diversity indices.
- Number of Moles Calculator (from Mass)0.171116 mol
- Species Evenness Calculator (Shannon and Pielou)1.2799
3 cards Open →
Uptime, adherence, CPM, growth, roll length, feed rates.
- Average Sales Price Calculator Formula and Examples100.00 $/unit
- Conveyor Belt Feet per Minute Calculator and Formula100.00 ft/min
8 cards Open →
Bike climbing power, lifting maxes, field goals, lightning.
- Bicycle Hill Climb Distance Calculator and Formula5.01 km
- Bike Distance Calculator: Measure a Cycling Route10.00 km
13 cards Open →
Millilitres to grams by ingredient, food per guest.
- 50 Grams to mL Calculator: Convert by Ingredient50.0 ml
- Catering Food Quantity Calculator: Portions Per Guest8.25 kg
8 cards Open →
Cards to start with
See all 84 →- 01Convert mph to fps (Feet per Second)Unit Conversions58.667 ft/s
- 02Feet and Inches to Meters CalculatorUnit Conversions1.7018 m
- 03Hour, Minute and Second CalculatorDays and Time9,930 s
- 04Calculate Horsepower from Torque and RPMEngines and Motion285.6 hp
- 05Calculate the Voltage Across a Capacitor (RC Charging)Electricity and Signals7.585 V
- 06Atmospheric Pressure from Elevation and TemperatureWater, Air and Heat84.82 kPa
- 07Calculate a Power of 2Numbers and Powers1,024
- 08Number of Moles Calculator (from Mass)Lab Science0.171116 mol
- 09Uptime and Availability CalculatorWork and Ops Metrics8.76 h
- 10Lightning Distance from Thunder CalculatorCycling and Outdoors2.06 km
How every card is kept
Read the method →- 01Textbook formulaEach card uses the standard equation and prints it, with every variable, unit and constant.
- 02Realistic defaultsThe card opens with a worked case. Change any number and the answer updates as you type.
- 03Stated roundingEach result says how many decimals it keeps, so you know what to copy.
- 04Checked exampleThe worked example repeats the sum step by step with the default numbers.