Map distance, declination, wind chill, heat index, lightning, elevation, and UV calculators.
Convert map measurements to real-world distances using map scale. Works with any scale ratio or representative fraction.
Estimate magnetic declination (compass adjustment) based on your location. Calculates the difference between true north and magnetic north.
Calculate the feels-like temperature from wind chill using the NWS formula. Critical for cold-weather camping safety.
Calculate the apparent temperature from heat and humidity using the NWS heat index formula. Know your heat stroke risk before hot-weather hiking.
Calculate how far away a lightning strike is from the flash-to-bang time delay. Sound travels about 1 mile every 5 seconds.
Calculate total elevation gain, loss, and average grade from waypoint data. Enter start, high, low, and end elevations for a trail segment.
Calculate safe sun exposure time based on UV index, skin type, elevation, and whether sunscreen is applied. Prevent sunburn on exposed ridgelines.