Field Kit
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Small calculators for planning a hike, reading a heat or smoke day, and catching rain and food scraps at home. Each one shows its formula and where the numbers come from.
Rain Barrel CalculatorHow many gallons one storm sends off your roof, and how many barrels that fills.
Compost CalculatorCubic yards, cubic feet and bags of compost for a bed or a lawn.
Heat Index CalculatorWhat temperature and humidity feel like together, with the Weather Service warning levels.
AQI Calculator (PM2.5)Turn a fine-particle reading into an Air Quality Index value and what it means for your day.
Hiking Time CalculatorNaismith's rule for time on the trail, with the water to carry and a check against daylight.Gear links may earn us a commission. As an Amazon Associate I earn from qualifying purchases.
Pack list
- Nalgene 32 oz wide-mouth bottle about 6 ozClose to indestructible, easy to fill from a filter pouch, marked in ounces and milliliters.$16.05 Amazon price, as of Oct 22, 2026, 4:26 PM UTCSee on Amazon
- Lepro rechargeable headlamp about 2.7 ozCharges by USB and has a red mode that keeps your night vision.$18.99 Amazon price, as of Oct 22, 2026, 4:26 PM UTCSee on Amazon
- Adventure Medical Kits Ultralight/Watertight .5 about 3.5 ozTrail first aid for one or two people in a waterproof pouch.$31.95 Amazon price, as of Oct 22, 2026, 4:27 PM UTCSee on Amazon
Product prices and availability are accurate as of the date/time indicated and are subject to change.