5 free mental health calculators and tools. Solve real-world mental health problems instantly with accurate, step-by-step results on ApexCalc.
| Constant | Symbol | Value |
|---|---|---|
| Speed of light | c | 2.99792458×10⁸ |
| Planck's constant | h | 6.62607015×10⁻³‴ |
| Boltzmann constant | kʙ | 1.380649×10⁻²³ |
| Avogadro's number | Nₐ | 6.02214076×10²³ |
| Gravitational constant | G | 6.6743×10⁻¹¹ |
| Gas constant | R | 8.31446 |
| Elementary charge | e | 1.602176634×10⁻¹⁹ |
| Electron mass | mₑ | 9.1093837015×10⁻³¹ |
| Proton mass | mₚ | 1.67262192369×10⁻²⁷ |
| Fine-structure constant | α | 7.2973525693×10⁻³ |
Screen for major depression severity using the validated 9-item Patient Health Questionnaire (PHQ-9). Widely used in primary care.
Screen for generalized anxiety disorder and severity using the validated 7-item GAD-7 scale.
Calculate AUDIT (Alcohol Use Disorders Identification Test) score to identify hazardous, harmful, and dependent drinking.
Screen for drug abuse and dependence using the validated 10-item DAST-10 questionnaire.
Estimate mental workload using the NASA Task Load Index (NASA-TLX). Assess mental demand, physical demand, temporal demand, performance, effort, and frustration.