Pool, Lawn and Yard Calculators
Free calculators for pool water, lawns and yards. Enter your measurements and get gallons, pounds, bags or rolls, with the formula and data source shown next to every result.
Pool Calculators
Find your water volume first, then dose salt, chlorine or shock for that volume.
| CalculatorCalculator | You enterYou enter | You getYou get |
|---|---|---|
| Pool Volume Calculator | Shape, length, width, depth | Gallons |
| Pool Salt Calculator | Gallons, salt system, current and target salt | Pounds of salt |
| Pool Chlorine Calculator | Gallons, current and target free chlorine, product | Amount of product |
| Pool Shock Calculator | Gallons, combined chlorine, product | Breakpoint dose |
| Pool Chemical Calculator | Test readings | In range or outside range |
| Pool Pump Size Calculator | Gallons, turnover hours | Flow rate (GPM) |
| Pool Heater Size Calculator | Gallons, temperature rise, hours | BTU per hour |
| Hot Tub Chemical Calculator | Gallons, chlorine or the cited ranges | Sanitizer dose or a range check |
Lawn Calculators
Measure your lawn area once, then work out seed, sod, soil and fertilizer.
| CalculatorCalculator | You enterYou enter | You getYou get |
|---|---|---|
| Grass Seed Calculator | Area, grass type, new lawn or overseed | Pounds of seed |
| Sod Calculator | Area, roll size, waste % | Rolls |
| Topsoil Calculator | Area, depth you enter | Cubic yards |
| Top Dressing Calculator | Area, depth | Cubic yards |
| Lawn Fertilizer Calculator | Area, nitrogen rate, product N percent | Pounds of product |
| Lime Calculator | Area, lime rate from your soil test | Pounds of lime |
Yard Calculators
Cover beds and paths: mulch and gravel by area and depth.
| CalculatorCalculator | You enterYou enter | You getYou get |
|---|---|---|
| Mulch Calculator | Area, depth | Cubic yards and bags |
| Gravel Calculator | Area, depth, weight factor | Tons |
Grass Seed Rates by Type
Seeding rates for the 6 most common US lawn grasses: 3 cool-season and 3 warm-season.
| GrassGrass | SeasonSeason | New lawn (lb per 1,000 sq ft)New | Overseeding (lb per 1,000 sq ft)Overseed |
|---|---|---|---|
| Tall Fescue | Cool | 6 to 8 | 3 to 4 |
| Kentucky Bluegrass | Cool | 2 to 3 | 1 to 1.5 |
| Perennial Ryegrass | Cool | 4 to 5 | Not verified |
| Bermudagrass | Warm | 1 to 2 hulled; 5 to 10 unhulled | Not verified |
| Zoysiagrass | Warm | 1 to 2 | Not verified |
| St. Augustinegrass | Warm | No seed rate | No seed rate |
New-lawn rates: Virginia Cooperative Extension, with Penn State Extension, K-State Research and Extension, or NC State Extension where a grass page says so. Overseeding: K-State Research and Extension. Cells marked Not verified do not have a cited rate.
How Our Calculators Work
Each calculator shows its formula and names its data source next to the result. Pool chemical doses are estimates: always follow the product label.