Lawn & Garden Calculators
11 calculators11 free calculators for lawn & garden homeowners.
Drip Irrigation Runtime
Calculate how long to run your drip irrigation system per session. Accounts for plant type, climate zone, emitter flow rate, and watering frequency — with a zone capacity check.
Fertilizer Application Rate
Calculate exactly how many pounds of fertilizer to spread on your lawn from the nitrogen % on the bag and your target rate — with a built-in warning when the rate is high enough to burn the grass.
Lawn Aeration & Overseeding Cost
Estimate lawn aeration and overseeding cost — hiring a pro vs. DIY with a rental and seed. Compare core vs. liquid aeration, add overseeding and starter fertilizer, and see the honest truth: DIY savings are often smaller than you think.
Lawn Seeding
Calculate how much grass seed and starter fertilizer you need for any lawn size. Get bag counts and cost estimates for Kentucky Bluegrass, Tall Fescue, Bermuda, and more.
Lawn Square Footage
Calculate your lawn area in square feet, square yards, and acres. Supports rectangular, circular, triangular, and L-shaped lawns. Use the result for seeding, fertilizing, and weed control.
Mulch
Calculate how much mulch you need for your garden beds — in cubic yards and number of bags — at the right depth, and compare the cost of bagged vs bulk mulch.
Outdoor Lighting Cost
Estimate the cost to install or upgrade low-voltage outdoor landscape lighting — fixtures, transformer, wiring, and labor — by fixture count, grade, and DIY vs professional.
Pest Control Cost
Estimate pest control cost by pest type — general pest control, termites, bed bugs, mosquitoes, or rodents — and compare a one-time treatment against a quarterly or monthly plan to see which actually costs less.
Smart Irrigation Controller Payback
See how fast a smart (weather-based, WaterSense) irrigation controller pays for itself. Estimate the annual water savings from your lawn size, climate, and water rate — with a utility rebate — and get the payback in years. Biggest returns go to those who over-water on a fixed timer.
Sprinkler System Installation Cost
Estimate the cost to install an in-ground sprinkler system. Priced by zone — enter your zone count (or estimate it from your lawn size) for an installed price, with a DIY-vs-professional comparison and add-ons like a backflow preventer and smart controller.
Tree Removal Cost
Estimate tree removal cost by height and how hard the tree is to reach — plus stump grinding and haul-away. See why a tree over the house or near power lines costs far more, and why the stump is almost always a separate charge.
About Lawn & Garden Calculators
Getting your lawn and garden right saves thousands in wasted materials and unnecessary labor. Most homeowners drastically overestimate how much seed, fertilizer, soil, or mulch they actually need, then either watch it go to waste or pay for removal. The difference between guessing and calculating can mean spending $200 instead of $800 on a single project.
Our lawn and garden calculators eliminate that guesswork by converting your actual measurements into exact material quantities. You'll know precisely how many square feet you're treating, how much product to buy, and what it should cost before you leave the store or place an order online. Beyond material quantities, these calculations help you make smarter gardening decisions based on your specific climate, soil type, and plant needs.
You can determine realistic watering schedules, optimal planting dates, and fertilizer amounts tailored to your yard rather than following generic package directions. Whether you're calculating mulch depth for weed prevention, figuring out how many plants fit in a space, or determining grass seed coverage for bare patches, having exact numbers prevents the frustration of incomplete projects or failed plantings. Start by identifying your specific project type, plug in your measurements, and get instantly actionable results that actually match your yard's unique conditions.