Outdoor Calculators
Free, verified outdoor calculators with step-by-step guides and reference data.
Bike Size Calculator — Road, Mountain & Hybrid Frame Fit
Find your bike frame size by height for road, mountain, and hybrid bikes. Cross-checks with the inseam formula and standover clearance.
Plant Spacing Calculator — Garden Bed Plant Count
Calculate how many plants fit your garden bed from length, width, and spacing. Compare square grid vs hexagonal spacing, which fits ~15% more plants.
Arrow Speed Calculator — IBO Speed Adjustment & KE
Estimate your actual arrow speed from your bow's IBO rating, draw length, draw weight, and arrow weight. Includes kinetic energy for bowhunting.
Arrow FOC Calculator — Front of Center for Archery
Calculate arrow Front of Center (FOC%) from length and balance point, or from individual components. Ratings for target, hunting, and extreme FOC applications.
Tarp Size Calculator: What Size Tarp Do I Need?
Calculate what size tarp you need for hay bales, flatbed trucks, pools, and ground cover. Recommends the nearest standard tarp size automatically.