Outdoors calculators

Enter the gear, food, water, and consumables you expect at the start of your heaviest leg. The calculator shows that departure weight, the full-trip food total, and how many food days fit your own comparison target.

Enter your trip length, daily hot-water need, measured stove fuel use, and any usable fuel already on hand. The calculator estimates the fuel to plan for, how many new canisters to add, and how much fuel should be left after the trip.

Enter your actual propane weight, appliance BTU ratings, daily burner time, and reserve. The calculator estimates daily propane use, runtime, trip fuel margin, and how much propane to start with.

Enter the distance to the trunk, the top and base readings, and the clinometer scale. The calculator corrects slope distance, estimates a conservative height range, and can compute live crown ratio from a crown-base reading.

Enter variable-radius plot tallies by DBH class to estimate stand basal area, trees per acre, quadratic mean diameter, and spacing. The borderline tree section applies the selected BAF, slope, and distance reference to return an in-or-out call.

Enter your one-way trail distance, outbound climbing and descending, walking speed, breaks, and deadline. The calculator estimates the latest safe turnaround point and whether the planned destination still fits.

Use a completed hike to calibrate a Naismith–Langmuir estimate for a planned route. The result separates moving time, expected stops, and an optional planning buffer.

Use the map scale, measured map distance, contour interval, and interval count to estimate grade and slope angle between two points. The calculator also works backward from a target grade to show how much map spacing that climb would need.

Enter the score-sheet measurements for a whitetail rack to estimate the gross typical frame, deductions, and selected typical or non-typical score.

Enter the forecast temperature, sustained wind, gust, and planned time outside. The calculator applies the NWS wind chill method to both winds and compares the colder result with exposed-skin frostbite chart bands.