Aviation & Flight Planning Calculation Guide

📚 Overview

Flying runs on numbers: how thin the air is, how much of the wind pushes across the runway, how far the fuel will go, and where the aircraft balances. The calculators here turn standard aviation formulas into quick answers for training and planning. They are learning and planning aids only. The aircraft flight manual, approved charts, and your instructor or operator always come first.

📐 Density Altitude from Pressure Altitude and Temperature

Pressure altitude is the altitude on the standard 1013.25 hPa (29.92 inHg) pressure setting. ISA temperature falls about 1.98 °C per 1,000 ft. Every °C above ISA adds roughly 118.8 ft to the density altitude, so hot days make the airport feel higher.

🔢 Worked Example

Scenario: A hot afternoon at an airfield 500 ft above sea level with QNH 1013 hPa and 32 °C.

• Field elevation: 500 ft
• QNH: 1013 hPa
• Outside air temperature: 32 °C

1. Pressure altitude is about 507 ft, since QNH is close to standard
2. ISA temperature = 15 − 1.98 × 0.507 = 14 °C
3. Temperature above ISA = 32 − 14 = 18 °C
4. Density altitude = 507 + 118.8 × 18 = about 2,645 ft

💡 Pro Tips

• Check density altitude before every takeoff on a hot day, at a high airfield, or with a heavy load.
• Use the crosswind component and your own limits, not only the aircraft demonstrated figure, before you decide to land.
• Plan fuel for the trip, the reserve, and a margin for weather and delays, and never rely on the reserve as extra range.
• Weigh the real aircraft and use the arms from its own weight and balance record, then check the CG envelope.

🧮 Aviation & Flight Calculators (11)

Put the formulas above into practice with these free tools:

❓ Frequently Asked Questions