🧮Calculators
Calculators cover finance, health, math, physics, engineering and everyday life: interest and loans, net salary, BMI, rule of three, conversions and more. Results are informational and educational — for important decisions, confirm with a professional and official sources.
2904 tools
Great Wall Build Years Calculator
Computes total Great Wall of China construction time from length in km and average meters of wall raised per year by workers.
Great Wall Workers Calculator
Estimates how many workers were needed to build the Great Wall of China from total structure volume and average rate per worker year.
Colosseum Rome Build Time Calculator
Computes total Colosseum of Rome construction time from cubic meter volume and daily average stone placed by workers.
Roman Mile Passus Calculator
Converts ancient Roman distances in mille passus, Roman feet, current km, equivalent to approximately 1480 meters per thousand paces.
Greek Trireme Speed Calculator
Computes typical ancient Greek trireme speed in knots, km h and mph from rowing regimes (cruise, combat) and rower count.
Cruise True Airspeed Calculator
Computes true airspeed (TAS) of an aircraft in cruise from indicated airspeed and altitude using typical 2 percent correction per thousand feet.
Aero Pressure Density Altitude Calculator
Computes pressure altitude from local QNH and density altitude from pressure altitude and ISA temperature deviation in feet for aviators.
Takeoff Runway Distance Calculator
Estimates single engine aircraft takeoff distance from weight, pressure altitude and temperature using typical aircraft manual corrections.
Landing Runway Distance Calculator
Estimates single engine aircraft landing distance from weight, pressure altitude and temperature using typical operating manual corrections.
Aviation Wind Gust Component Calculator
Computes headwind and crosswind component on the runway from meteorological wind direction, wind speed in knots and runway heading.
Flight Time Speed Distance Calculator
Computes planned flight time in hours and minutes from average true airspeed in knots and planned route distance in nautical miles.
Jet Fuel Burn Knots Liters Calculator
Computes total jet fuel burn in liters from average flow in kg per hour, ground speed in knots and route distance in nautical miles.
Load Factor Bank Angle Calculator
Computes load factor (g) in level turn from bank angle in degrees as the aircraft maintains altitude during typical maneuver or training.
STOL Stall Speed MPH Calculator
Estimates short takeoff and landing minimum speed of a light aircraft in mph from weight and wing maximum lift coefficient configuration.
Mach Number Speed Altitude Calculator
Computes aircraft Mach number from true airspeed in knots and altitude in feet using the speed of sound in the ISA standard atmosphere.
Mayday Helicopter Response Time Calculator
Computes average rescue helicopter response time to victim from distance in nautical miles, average speed in knots and dispatch prep time in minutes.
Jet Airway Route Time Calculator
Computes total jet airway route time from summed segments in nautical miles and average TAS at the selected cruise flight level on the way.
Helicopter Rotor Tip Speed RPM Calculator
Computes tip speed in meters per second of a helicopter rotor blade from rotor rpm and blade radius in meters of the main rotor.
Ship Speed Knots MPH Converter
Converts ship speed in knots to km h, miles per hour and meters per second showing equivalents in common nautical and metric units.
Nautical Mile Meridian Distance Calculator
Computes distance between two latitudes at same longitude in nautical miles using one nautical mile per minute of arc along Earth meridian.
Ocean Crossing Time Knots Calculator
Computes ocean crossing time in days and hours from average speed in knots and total oceanic route distance in nautical miles for sailing.
Tide Oscillation Height Time Calculator
Computes average time between high tide and low tide from typical semidiurnal cycle and oscillation amplitude in meters between tide heights.
Wave Height Wind Force Calculator
Estimates significant sea wave height in meters from average wind speed in knots and wind fetch using a simple empirical relation for sailors.
Horizon Distance Eye Height Calculator
Computes visual distance to sea horizon in nautical miles and km from observer eye height in meters including standard atmospheric refraction.
Anchor Bottom Time Feet Calculator
Computes time for anchor to reach sea bottom from depth in feet and average chain descent rate of the boat winch during the operation.
Naval Rope Length Fathoms Calculator
Converts naval rope length in fathoms to meters, feet and yards using one fathom equal to approximately 1.8288 meters traditional value.
Submarine Surfacing Time Calculator
Computes submarine surfacing time from given depth in meters at the average upward velocity in meters per second of the rising hull body.
Sailing Apparent Wind Knots Calculator
Computes apparent wind speed in knots from true wind speed and boat speed under sail using direct vector sum in a head wind sailing course.
Lighthouse Visible Range Calculator
Computes lighthouse light visible range in nautical miles from light height and observer eye height on the vessel sailing at sea level.
Tide Collector Liters Time Calculator
Computes time for tide collector to fill given liters volume from average tide inflow in liters per second received on the vessel.
Sea Column Pressure Depth Calculator
Computes hydrostatic column pressure in salt water from given depth in meters summing atmospheric pressure and typical sea water density.
Ballistic Bore Projectile Speed Calculator
Computes average projectile speed inside firearm bore from barrel length in millimeters and propellant burn time in milliseconds inside the cartridge.
Wind Drift Projectile Shot Calculator
Computes lateral drift in meters of a rifle projectile from time of flight in seconds and crosswind in mph summing linear lateral deflection.
Ballistic Projectile Flight Time Calculator
Computes total ballistic projectile flight time from muzzle to target given distance in meters and average projectile velocity in meters per second.
High Trajectory Projectile Height Calculator
Computes maximum projectile trajectory height from initial velocity and elevation angle using basic ballistic vacuum equations of motion.
Low Trajectory Rifle Shot Calculator
Computes rifle bullet drop in cm at 100 meters from BC (ballistic coefficient), muzzle velocity in fps and sight zero distance in yards range.
Gun Recoil Momentum Calculator
Computes firearm recoil in joules and recoil velocity in meters per second from projectile mass, muzzle velocity and total firearm mass.
Gun Chamber Pressure Pascal Calculator
Computes peak gun chamber pressure in pascal from total force exerted by propellant gases and projectile cross sectional area in square mm.
Projectile Spin Rifling RPM Calculator
Computes spin rate in rpm given to a bullet by barrel rifling from muzzle velocity in fps and rifling twist rate in inches per turn.
Wind Deflection Shot MPH Calculator
Computes horizontal bullet deflection in inches at 600 yards from crosswind speed in mph and standard ballistic coefficient of the projectile.
Projectile Impact Altitude Vacuum Calculator
Computes projectile impact altitude when fired at an angle in vacuum from initial velocity, elevation angle and horizontal distance to the shot.
Explosive Fuse Detonation Time Calculator
Computes safety fuse burning time of explosive from fuse length in cm and standard burn rate in seconds per cm of the safety cord.
Blast Shock Wave Pressure Calculator
Computes peak shock wave overpressure in kPa at a distance in meters from a TNT charge in kg using Hopkinson scaling empirical relation.
Heron Triangle Area Calculator
Computes triangle area from three sides using Heron formula with semi-perimeter and square root.
Polygon Area Shoelace Calculator
Computes area of a simple polygon from a list of vertices using the Gauss shoelace formula and absolute value.
Circle and Ellipse Area Calculator
Computes circle area from radius and ellipse area from semi-axes a and b using the standard pi formulas.
Trapezoid Area Formula Calculator
Computes trapezoid area from larger base B, smaller base b and height h using the classic average bases formula.
Ellipse Perimeter Ramanujan II Calculator
Computes ellipse perimeter from semi-axes a and b using Ramanujan second approximation formula with high accuracy.
Pyramid Base Height Volume Calculator
Computes pyramid volume from base area and height using the classic one third times base area times height formula.
Torus Revolution Volume Calculator
Computes torus revolution volume from major radius R and tube radius r using the 2 pi squared times R r squared formula.
Platonic Solid Volume Calculator
Computes volume of the five Platonic regular polyhedra from edge length using the classic constant factor for each solid type.
Torus Revolution Surface Calculator
Computes torus revolution surface area from major radius R and tube radius r using the 4 pi squared times R r formula.
Point Line Distance 2D Calculator
Computes distance from a point to a line in the plane given line coefficients a x plus b y plus c equals zero and point coordinates.
Parallel Lines Distance 2D Calculator
Computes distance between two parallel lines in the plane from coefficients a x plus b y plus c1 and a x plus b y plus c2.
Vector Projection Calculator
Computes scalar and vector projection of vector u onto vector v in three dimensions using dot product and unit vector.
Arithmetic Geometric Harmonic Mean Calculator
Computes arithmetic, geometric and harmonic means simultaneously for a list of positive numbers separated by comma.
Median Quartiles IQR Calculator
Computes median, first quartile Q1, third quartile Q3 and interquartile range IQR of a list of numerical values.
Sample and Population Standard Deviation Calculator
Computes both sample standard deviation with n minus one and population standard deviation with n divisor from a list of numbers.
Pearson Spearman Correlation Calculator
Computes simultaneously Pearson product moment correlation and Spearman rank correlation coefficients between two variables.
Linear Regression OLS Calculator
Computes simple linear regression coefficients by ordinary least squares method from a list of x y data pairs.