IC Engine Performance Calculator

IC Engine Performance Formula

Worked Example

A diesel engine giving 200 N·m at 2000 rpm on 9 kg/h of 42 MJ/kg fuel:

1. BP = 2πNT/60,000 = 2π × 2000 × 200 ÷ 60,000 = 41.88790205 kW
2. η_bth = BP / (ṁ_f × CV) = 41.88790205 ÷ 105 kW

In g/kWh: 214.8591732 g/kWh · Brake thermal efficiency: 39.89324005 % · Mechanical efficiency BP/IP: 83.7758041 % · Friction power IP − BP: 8.112097952 kW · In horsepower: 56.1726019 hp

GATE tip

For diesel fuel given in litres, convert with a density of about 0.835 kg/L before computing BSFC.

More Farm Machinery and Power Calculators

• Drawbar Power Calculator

  DBP = Draft × Speed

  Draft = specific draft × width × depth; kW = kN × m/s

  Example: A plough cutting 90 cm × 15 cm in soil of 7 N/cm² specific draft at 4.5 km/h: Drawbar power = 11.8125 kW.

  Open the drawbar power calculator →

• Field Capacity Calculator

  TFC = W S / 10, EFC = TFC × field efficiency

  W in m, S in km/h, capacities in ha/h

  Example: A 2.5 m implement at 5 km/h with 80 % field efficiency: Effective field capacity = 1 ha/h.

  Open the field capacity calculator →

• Wheel Slip Calculator

  Slip = (1 − V_a/V_t) × 100

  tractive efficiency = drawbar power / axle power

  Example: A tractor with a no-slip speed of 6 km/h moving at 5.1 km/h: Wheel slip = 15 %.

  Open the wheel slip calculator →

• Farm Machinery Cost Calculator

  Cost/h = (D + I + HIT)/H + fuel + lube + repair + labour

  D = (P − S)/L, I = (P + S)/2 × i

  Example: A tractor costing 8 lakh used 1000 h a year for 10 years: Total operating cost = 901.8 per hour.

  Open the farm machinery cost calculator →

Frequently asked questions

Sources

• The International System of Units (SI), 9th edition (SI Brochure), Bureau International des Poids et Mesures .

Last reviewed: 2026-10-15. Factors are stored exactly and computed with 50-digit decimal arithmetic. See how we verify conversion factors.