Audiology & Hearing Assessment
Every audiology & hearing assessment calculator on CalcEngines — unit converters, derived indices and interpretive tools, each with its formula, a worked example and the reference intervals it is judged against.
8 calculators in this section
- Air-Bone Gap and Conductive Component CalculatorThe air-bone gap at one frequency, with the published criteria for a significant gap, the bone vibrator's output ceiling, the Carhart notch and why a negative gap is an artefact. A gap localises a loss; it does not grade one.
- Hearing Handicap Percentage CalculatorBinaural hearing impairment as a percentage by the AAO-HNS and AMA method — a 25 dB fence, 1.5% per decibel, and the better ear weighted five to one. An arithmetic percentage under one named scheme, not a disability rating.
- Noise Exposure Dose and Daily Exposure Level CalculatorDaily noise dose, permitted duration and the equivalent eight-hour level, with the exchange rate as an input — because a 3 dB and a 5 dB rate give permitted times that differ several-fold for the same measured level.
- OSHA Standard Threshold Shift CalculatorThe 2000, 3000 and 4000 Hz average shift from baseline that 29 CFR 1910.95(g)(10)(i) defines as a standard threshold shift, with the optional age correction shown separately and the 25 dB element of 29 CFR 1904.10 beside it.
- Ototoxicity Monitoring Threshold Shift InterpreterApply ASHA's three published limbs for a significant change in hearing during cochleotoxic drug therapy — 20 dB at one frequency, 10 dB at two adjacent frequencies, or loss of response at three consecutive frequencies — with the confirmation ASHA requires.
- Pure Tone Average CalculatorFive published pure tone averages from one audiogram — the classic three-frequency average, WHO's four-frequency average, the AAO-HNS set, the Fletcher index and the occupational 2–4 kHz average — with the spread between them, because they are not interchangeable.
- Rinne and Weber Tuning Fork Test InterpreterThe twelve possible Rinne and Weber combinations and the pattern each one points to, including the four that are internally inconsistent and the false negative Rinne that produces them.
- WHO Grades of Hearing Impairment InterpreterPlace a better-ear four-frequency pure tone average in WHO's 2021 grades of hearing loss or in the earlier WHO grades, and see where the two disagree — because both are still in use and the same audiogram can fall in differently-named grades.