Free turf calculators
Quick numbers for the jobs that come up every week. These free turf calculators run in your browser — no sign-up, no email — and each one shows its formula and where every number comes from.
Fertilizer calculator
How much product to spread for a nitrogen rate, and how many bags.
Seed calculator
Pounds of seed and bags for an area, from a bulk or pure-live-seed rate.
Topdressing calculator
Cubic yards and tons of sand for a topdressing depth and area.
Sprayer calibration calculator
Gallons per acre from nozzle flow, speed and spacing, and product per tank.
Turf unit converter
lb per 1,000 ft² to kg/ha, fl oz to L/ha, gallons per acre, ppm and more.
Turf light checker
Season light on a green from its hours of direct sun, against published research for your grass.
Always follow the product label. Every tool shows its formula and sources.
Want these numbers for your own course?
Atlas maps the area of every green, tee and fairway, Cortex keeps the records, and our shade and light analysis models the light on every green.