# Use Pilot Calc

Pilot Calc is a set of aviation calculators and conversions in an FMS-style interface.

<figure><img src="/files/C377eCkrZ7xWbuyd0eQg" alt=""><figcaption></figcaption></figure>

## <mark style="color:$warning;">Open a calculator</mark>

1. Open **PILOT CALC** from the Home screen.
2. Choose the calculator screen from the menu.
3. Tap a value field to enter or change a number.
4. Use the bottom navigation keys to move between calculator screens.

## Available screens

| Screen              | Use                                                                            |
| ------------------- | ------------------------------------------------------------------------------ |
| Altitude / Airspeed | CAS, TAS, Mach, OAT, ISA, and density altitude relationships.                  |
| Speed               | Convert between common speed units.                                            |
| Distance / Altitude | Convert distance and altitude units and calculate gradient or rate of descent. |
| Wind                | Solve wind triangle and runway wind components.                                |
| Length              | Convert length units.                                                          |
| Weight              | Convert kilograms and pounds.                                                  |
| Temperature         | Convert Celsius and Fahrenheit.                                                |
| Volume              | Convert fuel volume and weight using density.                                  |
| Timezone            | Convert UTC and local time where configured.                                   |
| Rest                | Build an in-flight rest schedule and countdown alarm.                          |
| FDP                 | Estimate FDP margin using the configured rule set.                             |
| Basic Calc          | Arithmetic with memory functions.                                              |

## <mark style="color:$warning;">OFP auto-fill</mark>

Some screens can use the currently loaded OFP as a starting point. For example, FDP and rest screens may pre-fill times from the OFP where available. Review every pre-filled value before relying on the result.


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