Pressure & density altitude
Pressure altitude and density altitude from indicated altitude, altimeter setting and OAT.
Indicated 5,000 ft, 29.50 in.Hg, +5 °C → pressure altitude 5,392 ft, density altitude 5,473 ft.
The numbers, run for you.
A flight computer in your browser — density altitude, true airspeed, wind, fuel, and conversions. Instant, nothing to install, no sign-in.
Pressure & density altitude
Pressure altitude and density altitude from indicated altitude, altimeter setting and OAT.
Enter the values to compute.
Training aid only — not for operational flight planning. Always verify against your POH, your instructor, and official Transport Canada sources.
The free corner of the thing that gets you to your written.
Reckon does the math. Ready for Solo does the rest.
- RadioATC calls graded the moment you stop speaking.
- ExamsEvery Canadian written, drilled where you’re weak.
- MaeAn AI instructor for the hours between lessons.
Every calculator
The full set, with a worked example for each — no sign-in to use any of them.
Show all 21 calculators
Altitude & atmosphere
Standard atmosphere
Standard-atmosphere temperature and pressure at any altitude (US Standard Atmosphere 1976).
At 10,000 ft the standard atmosphere is about −4.8 °C and 20.58 in.Hg.
Convective cloud base
Estimated cumulus cloud base (AGL) from surface temperature and dew point.
20 °C surface, 10 °C dew point → about 4,090 ft AGL.
Airspeed
True airspeed
True airspeed and Mach from calibrated airspeed, pressure altitude and OAT (compressible).
CAS 130 kt, 10,000 ft, −5 °C → about 151 kt true (Mach 0.24).
Mach number
Mach number from true airspeed and outside air temperature.
TAS 480 kt at −50 °C → about Mach 0.81.
Wind
Wind triangle
Wind-correction angle, true heading and groundspeed from TAS, true course and wind.
TAS 120, course 090, wind 180/20 → crab +9.6°, heading 100°, groundspeed 118 kt.
Crosswind & headwind
Headwind and crosswind components for a runway from the reported wind.
Wind 120/20 on runway 09 → 17.3 kt headwind, 10 kt crosswind from the right.
Heading
True → compass heading
Compass heading from true heading, magnetic variation and compass deviation.
True 090, 16°E variation, +2° deviation → compass 072.
Navigation
Rhumb-line course & distance
Constant-heading course and distance between two latitude/longitude points.
Toronto → Ottawa ≈ course 060°, 196 NM.
Holding-pattern entry
Recommended hold entry (direct / parallel / teardrop) from your heading and the holding radial.
Radial 270, heading 180, right turns → direct entry.
Estimated time of arrival
ETA from a departure time and enroute time (minutes past midnight, wraps over 24 h).
Depart 23:45Z + 30 min → ETA 00:15Z (15).
Performance
Glide distance
Glide distance from a glide ratio and the altitude available to lose.
9:1 glide from 5,000 ft ≈ 7.4 NM.
Weight & fuel
Fuel volume → weight
Fuel weight from volume by fuel type.
40 US gal of avgas ≈ 240 lb.
Percent MAC
CG as a percentage of the mean aerodynamic chord.
CG 39, LEMAC 35, MAC 60 → 6.7 % MAC.
Conversions
Speed
Convert between knots, miles per hour and km/h.
100 kt ≈ 115 mph.
Distance
Convert between nautical miles, statute miles and kilometres.
100 NM ≈ 115 SM.
Altitude / length
Convert between feet and metres.
5,000 ft ≈ 1,524 m.
Fuel volume
Convert between US gallons and litres.
40 US gal ≈ 151 L.
Weight
Convert between pounds and kilograms.
1,000 lb ≈ 454 kg.
Temperature
Convert between Celsius and Fahrenheit.
15 °C = 59 °F.
Pressure
Convert between inches of mercury and hectopascals.
29.92 in.Hg ≈ 1013 hPa.