Skip to content

19 calculators

Aviation & marine calculators

Density altitude, true airspeed, crosswind, weight and balance, great-circle routes and sailing arithmetic.

A–Z index of all calculators

A
C
D
F
G
H
M
R
S
T
W

A

Anchor scope Rode to let out for a given scope, allowing for tide, freeboard and swing radius.

C

Cloud base Convective cloud base from temperature and dew point, with the freezing level.
Crosswind component Crosswind and headwind components from runway heading and reported wind.

D

Dead reckoning Distance run and the change in latitude and departure from a course and time.
Density altitude Pressure altitude and density altitude from field elevation, altimeter setting and temperature.
Descent planning Where to start a descent, and the rate needed for a given gradient or angle.
Dew point and humidity Dew point from temperature and relative humidity, with the wet bulb and heat index.

F

Fuel planning Fuel required including reserves, contingency and alternate, with endurance and range.

G

H

Hull speed Displacement hull speed from waterline length, with the speed-length ratio.

M

Mach number Mach number from true airspeed and temperature, with the speed of sound at altitude.

R

Runway length Landing distance corrected for altitude, weight, wind and surface.

S

Sailing VMG Velocity made good to windward, and the tacking angle that maximises it.

T

W

Other subjects