Dyno Correction Calculator
SAE-corrected HP from dyno conditions.
Inputs
%
Results
SAE corrected HP
294
SAE corrected torque
313.6
SAE correction factor0.98
DIN corrected HP304.8
DIN corrected torque325.1
DIN correction factor1.02
Dry air pressure (inHg)29.82
Density altitude (ft)1,796
How to Use This Calculator
- Enter Measured HP, Measured torque (lb-ft), and Barometric pressure (inHg).
- Set Intake air temp (°F) and Relative humidity (%).
- Review SAE corrected HP and SAE corrected torque.
- Use SAE correction factor and DIN corrected HP to inform your decision.
How the result changes with Measured HP
| Measured HP | SAE corrected HP | SAE corrected torque |
|---|---|---|
| 501 | 491 | 313.6 |
| 1,751 | 1,716 | 313.6 |
| 3,250 | 3,185 | 313.6 |
| 4,500 | 4,410 | 313.6 |
What each input means
- Measured HP
- Uncorrected horsepower as shown on the dyno.
- Measured torque (lb-ft)
- Uncorrected torque as shown on the dyno.
- Barometric pressure (inHg)
- Local barometric pressure. Sea level ≈ 29.92, Denver ≈ 24.6.
- Intake air temp (°F)
- Air temperature at the dyno intake.
- Relative humidity (%)
- Ambient relative humidity during the dyno pull.
What each result means
- SAE corrected HP
- Horsepower corrected to SAE J1349 standard conditions (77°F, 29.235 inHg, 0% RH).
- SAE corrected torque
- Torque corrected to SAE J1349 standard conditions.
- SAE correction factor
- Multiply raw dyno numbers by this factor for SAE-corrected values.
- DIN corrected HP
- Horsepower corrected to DIN 70020 standard (20°C, 1013.25 mbar).
- DIN corrected torque
- Torque corrected to DIN 70020 standard.
- DIN correction factor
- Multiply raw dyno numbers by this factor for DIN-corrected values.
- Dry air pressure (inHg)
- Barometric pressure minus water vapor pressure.
- Density altitude (ft)
- Effective altitude based on temperature and pressure — higher = less power.
How this is calculated
Worked example, using the default values
- Identify Input Parameters4 parametersMeasured HP = 300, Measured torque (lb-ft) = 320, Barometric pressure (inHg) = 29.92, Intake air temp (°F) = 85 = 5 input(s) provided
- Calculate SAE corrected HPSAE corrected HP = measuredHp * saeCf294 = 294
- Calculate SAE corrected torqueSAE corrected torque = measuredTorque * saeCf313.6 = 313.6
- Calculate SAE correction factorSAE correction factor = (29.235 / dryAirPressureInHg) * pow((intakeTempF + 460) / 545.4, 0.5)0.98 = 0.98
- Calculate DIN corrected HPDIN corrected HP = measuredHp * dinCf304.8 = 304.8
Engine last updated . Checked against 1 independently-derived test — how we verify calculators.
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