Reynolds Number Flow Regime Calculator
Calculates the Reynolds number for pipe or external flow from fluid density, velocity, characteristic length, and dynami...
Calculates the Reynolds number for pipe or external flow from fluid density, velocity, characteristic length, and dynami...
Calculates the magnetic field inside a solenoid from number of turns, length, and current, using μ₀ = 4π×10⁻⁷ T·m/A.
Uses a simplified Framingham risk scoring system based on age, total cholesterol, HDL cholesterol, systolic BP (treated/...
Estimates hockey puck speed from shot power, stick flex efficiency, and player strength, using simplified energy transfe...
Calculates hydraulic cylinder push (extend) force from bore diameter and supply pressure, and pull (retract) force consi...
Estimates BAC using Widmark: BAC = (alcohol_g) / (weight_kg × r) − 0.015 × hours. r ≈ 0.68 males, 0.55 females. Time to...
Calculates voltage drop along a two-conductor cable run from current, cable resistance per km, and cable length.
Estimate VO₂ max from resting and maximum heart rate — a 30-second screening estimate, not a clinical measurement.
Estimate body fat percentage using the US Navy circumference method, which uses neck, waist, and (for women) hip measure...
Compute the per-interval maintenance dose required to keep a drug at a target steady-state concentration, given clearanc...
Compute the maximum allowable blood loss (MABL) before transfusion is needed in surgery: MABL = EBV · (Hb_initial − Hb_t...
Estimate body density from the Jackson-Pollock 3-site skinfold equation (chest + abdomen + thigh for men; triceps + supr...
Estimated daily calories are a loose target, not a contract. A quick guide to using the number without letting it use you.
BMI is a one-number screen, not a diagnosis. Here is how to read it honestly — and what to look at alongside it.