Formula categories
30 subjects across 922 solvers. A formula can sit in more than one, so the counts add to more than the catalog. Looking for a theme rather than a subject? Formula sets group formulas by the question they answer, and the engineering hub arranges them by discipline.
Algebra 102 solvers
Midrange · Factorial · Present Value · Percent Error · Percent Change · all 102 →
Astronomy & Gravitation 12 solvers
Hubble's Law · Orbital Period · Escape Velocity · Orbital Velocity · Stellar Luminosity · all 12 →
Biomedical & Clinical 20 solvers
Serum Anion Gap · Mean Arterial Pressure (MAP) · Corrected Calcium for Albumin · IV Infusion Rate (mL per Hour) · Arterial Oxygen Content (CaO₂) · all 20 →
Chemistry 118 solvers
Density · Boyle's Law · Raoult's Law · Charles's Law · Ideal Gas Law · all 118 →
Civil & Surveying 68 solvers
Back Azimuth · Chezy Equation · Hydraulic Radius · Grade to Slope Angle · Shear Flow (q = VQ/I) · all 68 →
Computer Science 25 solvers
RSA Modulus · RSA Totient · Compression Ratio · File Transfer Time · Nyquist Sampling Rate · all 25 →
Electrical Trade 47 solvers
Skin Depth · Voltage Divider · Current Divider · Motor Efficiency · Decibel Power Gain · all 47 →
Electricity & Magnetism 77 solvers
Ohm's Law · Skin Depth · Coulomb's Law · Voltage Divider · Current Divider · all 77 →
Everyday & Health 19 solvers
Body Mass Index (BMI) · Fuel Consumption (L/100 km) · Miles per Gallon ↔ L/100 km · IV Infusion Rate (mL per Hour) · Dew Point (Magnus Approximation) · all 19 →
Fluid Mechanics 107 solvers
Mach Number · Prandtl Number · Nusselt Number · Chezy Equation · Reynolds Number · all 107 →
Geometry 108 solvers
Kite Area · Arc Length · Square Area · Cone Volume · Cube Volume · all 108 →
Heat Transfer 39 solvers
Biot Number · Fourier Number · Prandtl Number · Nusselt Number · Fin Heat Transfer Rate · all 39 →
HVAC & Hydronics 81 solvers
Total Dynamic Head · Fan Brake Horsepower · Pipe Internal Volume · EER to COP Conversion · Mixed Air Temperature · all 81 →
Industrial Engineering 20 solvers
Takt Time · Reorder Point · Machine Utilisation · Equivalent Annual Cost · Process Capability (Cp) · all 20 →
Mechanics 135 solvers
Torque · Gear Ratio · Hooke's Law · Orbital Period · Power (P = W/t) · all 135 →
Modern Physics 13 solvers
Time Dilation · Lorentz Factor · Length Contraction · Photoelectric Effect · De Broglie Wavelength · all 13 →
Money & Business 21 solvers
Break-Even Quantity · Simple Payback Period · Equivalent Annual Cost · Capital Recovery Factor · Inventory Turnover Ratio · all 21 →
Optics 14 solvers
Apparent Depth · Brewster's Angle · Thin Lens Equation · Lens Power in Diopters · Snell's Law of Refraction · all 14 →
Physics 233 solvers
Torque · Density · Ohm's Law · Gear Ratio · Hooke's Law · all 233 →
Probability 29 solvers
Factorial · Complement Rule · Permutations (nPr) · Combinations (nCr) · Poisson Probability · all 29 →
Soil Mechanics 35 solvers
Liquidity Index · Hydraulic Gradient · Saturated Unit Weight · Water (Moisture) Content · Bearing Capacity Factor Nq · all 35 →
Statistics 50 solvers
Midrange · Percent Error · Complement Rule · Percent Difference · Outlier Lower Fence · all 50 →
Strength of Materials 60 solvers
Poisson's Ratio · Liquidity Index · Factor of Safety · Basquin S-N Relation · Normal (Axial) Stress · all 60 →
Thermodynamics 103 solvers
Boyle's Law · Latent Heat · Biot Number · Charles's Law · Fourier Number · all 103 →
Trades & Construction 16 solvers
Board Feet of Lumber · Stair Stringer Length · Roof Pitch to Slope Angle · Stair Comfort Rule (2R + T) · Stair Riser Count from Total Rise · all 16 →
Trigonometry 23 solvers
Arc Length · Law of Sines · Back Azimuth · Law of Cosines · Circular Sector Area · all 23 →
Vectors & Matrices 24 solvers
Trace of a 2×2 Matrix · Cross Product Magnitude · Magnitude of a 2D Vector · Magnitude of a 3D Vector · Determinant of a 2×2 Matrix · all 24 →
Water & Wastewater 55 solvers
Chezy Equation · Hydraulic Radius · BOD Mass Loading · Surface Overflow Rate · Backwash Water Volume · all 55 →
Water Treatment 119 solvers
Density · Cylinder Volume · Glycol Dilution · Specific Gravity · Percent Blowdown · all 119 →