Health6 min
The WHR (Waist-to-Hip) Ratio — How to Calculate It and What It Means
The WHR ratio is the ratio of waist to hip circumference. We explain the formula, norms for women and men and a calculation example. Body shape and risk.
Blog — page 11
Sport6 min
Calories Burned While Running — How Much You Really Burn
How many calories does running burn? A formula based on body weight and distance, the effect of pace and a 10 km example. Check the real values.
Health7 min
BMR — Basal Metabolic Rate, How to Calculate It
What is BMR and how to calculate it? The Mifflin-St Jeor formula, factors affecting basal metabolism and a step-by-step calculation example.
Science6 min
Ohm's Law — How to Calculate Voltage, Current and Resistance
Ohm's law in practice: the formula U = I × R, how to find voltage, current and resistance. Worked numerical example in SI units plus power formulas.
Science6 min
Density — How to Calculate It from the Formula, with Examples
How to calculate the density of a substance: the formula ρ = m / V, SI units, converting kg/m³ to g/cm³, and a step-by-step numerical example.
Science6 min
Molar Concentration — How to Calculate It Step by Step
How to calculate the molar concentration of a solution: the formula c = n / V, finding moles from mass, the unit mol/dm³, and a worked example with salt.
Science6 min
pH of a Solution — How to Calculate It and What It Means
How to calculate the pH of a solution from the hydrogen ion concentration: the formula pH = -log[H⁺], the pH scale, acids and bases, and a worked example.
Science6 min
Kinetic Energy — Formula and Worked Examples
The kinetic energy of a body: the formula Ek = ½mv², the unit joule, the effect of mass and speed, and a step-by-step numerical example in SI units.
Science6 min
Force and Acceleration — Newton's Second Law of Motion
Newton's second law of motion: the formula F = m × a, the unit newton, how to calculate force, mass and acceleration, and a worked example in SI units.
Science6 min
Pressure — How to Calculate It from the Formula p = F / S
How to calculate pressure: the formula p = F / S, the unit pascal, the effect of force and area on pressure, and a step-by-step numerical example in SI.
Science6 min
Average Speed — How to Calculate It from the Formula v = s / t
How to calculate average speed: the formula v = s / t, the units m/s and km/h, unit conversion, and a numerical example with distance and time.
Science6 min
Area and Perimeter of Geometric Figures — Formulas and Examples
Formulas for the area and perimeter of a square, rectangle, triangle and circle. Units, the difference between area and perimeter, and step-by-step examples.