Fuel Density Calculation vs K4 Tools

Fuel Density Calculation is a cockpit utility for comparing receipt-based fuel uplift calculations against indicated fuel on board. Enter landing fuel, fuel density or specific gravity, fuel receipt quantities, and indicated FOB. The app calculates uplift, landing fuel plus uplift, and the resulting difference in both percent and pounds. Supports gallons and liters, automatic decimal formatting, and specific gravity conversion for receipts that provide SG instead of fuel density. This app is a calculation aid and does not replace approved aircraft, company, or maintenance procedures.

K4 Tools helps flight crews complete inflight fuel and time checks quickly and accurately — with calculators built around your current flight plan. Highlights: • Magic Scanner: Use the iPhone camera on support models to scan the FMS Position Report and auto-fill required fields. • Duty/Rest Calculator: See Max Duty End, Latest Legal Takeoff, and required rest based on crew size, sequence, and consent — with live remaining duty. • Crew Rest: Share break schedules and keep track visually on the crew break Timeline. • Fuel Checks: Verify pre‑flight fuel upload accuracy across multiple receipts. • Pre-flight weather verification via calculated ETA's at Departure, Destination, Alternate, and ETP Airports. • iPhone + iPad: Optimized for both portrait and landscape use on iPad — including mounted flight-deck configurations.. Limits and warnings appear when operational or contractual thresholds are approached or likely to be exceeded, so you can take corrective action early. Planned updates: - B777 flight plan support for both standard and ETOPS plans. - Crew Rest Alarms automatically set for selected break period. - Custom Crew Rest break lengths