Education

Determine genotype (AA vs Aa) by test cross with aa. Any recessive offspring proves heterozygous; zero recessive suggests homozygous with P = 0.5^n. Derived from Mendel 1866, Griffiths, Hartl & Clark 2007, StatPearls. Educational use only.

Media

Turn a single vocal into a wide stereo harmony stack of 3, 5, or 7 transposed voices panned across the field.

Media

Generate transposed harmony layers at musical intervals (3rd, 5th, octave above or below) over a vocal or melody.

Health

Compute CI = CO / BSA with BSA from the Mosteller formula √(height × weight / 3600). Normal 2.5–4.0 L/min/m². Derived from Mosteller NEJM 1987, Du Bois 1916, StatPearls, LITFL. Not medical advice.

Health

Convert blood glucose between mg/dL and mmol/L. Factor 0.05551 (molar mass 180.156 g/mol). Derived from ADA 2024, WHO 2006, Young 1987, StatPearls, ADAG 2008. Not medical advice.

Health

Compute SVR = 80 × (MAP − CVP) / CO (dyn·s/cm⁵). Normal 800–1440; high in cardiogenic shock and hypertension; low in distributive shock and vasodilators. Derived from Grossman 1991, StatPearls, LITFL, Vincent NEJM 2013, Braunwald. Not medical advice.

Health

Calculate PAO₂ = FiO₂ × (P_atm − 47) − PaCO₂ / RQ. Defaults: P_atm 760 mmHg (sea level), RQ 0.8. Gives a directional hint vs expected ~100 mmHg. For full A-a gradient interpretation use a-a-gradient-calculator. Derived from StatPearls, LITFL, Cornell PICU, and West. Not medical advice.

Health

Calculate VA = (VT − VD) × RR in L/min. VD may be supplied or estimated as ~2 mL/kg body weight. Normal resting ~4–6 L/min; low → hypercapnia, high → hypocapnia. Derived from West, LITFL, StatPearls, and Radford 1955. Not medical advice.

Education

Convert a dog or cat's age into human-equivalent years using the modern AVMA method (with breed-size grouping for dogs) or the UCSD epigenetic formula, and see the pet's life-stage milestone plus a printable vet-visit summary card.

Health

Calculate Qs/Qt = (CcO₂ − CaO₂)/(CcO₂ − CvO₂). PAO₂ from alveolar gas equation. Normal <5%; >20% severe shunt refractory to O₂. Defaults SvO₂=0.75, PvO₂=40 when mixed-venous values unavailable. Derived from Berggren 1942, StatPearls, LITFL, West. Not medical advice.

Design

Upload one image and preview how it appears on Instagram Feed/Story/Reels, TikTok, YouTube, X, and LinkedIn — with platform safe-zone overlays showing exactly which pixels get cropped or covered by UI before you publish.

Media

Enter a melodic contour as scale degrees (1-7 or do-re-mi) plus a target key, and get candidate diatonic chord progressions ranked by voice-leading smoothness, with roman-numeral analysis and an audio demo.