Lawn Overseeding Grass Seed (lbs), Starter Fertilizer & Topdressing Soil Calculator

Compute grass seed lbs, nitrogen lbs, and topdressing cubic yards per 1,000 sq ft.

Total Grass Seed Required
32.5 lbs
Total Grass Seed Cost ($) $146.25
Topdressing Compost Volume 5.02 cu yd
Starter Nitrogen Needed (0.9 lb N/1k) 5.85 lbs N
Inputs
⚡ Scenarios:
sq ft
Total lawn area to seed or overseed in square feet.
lbs/1k sq ft
Seed application rate per 1,000 sq ft (4–5 lbs overseeding, 8–10 lbs bare soil tall fescue).
inches
Compost topdressing depth in inches (0.25 in standard for overseeding).
$/lb
Grass seed cost per pound ($/lb).
Results & Graph
Total Grass Seed Required
32.5 lbs
Total Grass Seed Cost ($)
$146.25
Topdressing Compost Volume
5.02 cu yd
Starter Nitrogen Needed (0.9 lb N/1k)
5.85 lbs N

Total Grass Seed Required

Graph 1 • Lawn Seed & Topdressing • Domain Architecture & Live Telemetry Maps Lawn Area Sq Ft, Seed Rate Lbs Per1000 Sq Ft, Topdressing Depth Inches through Lawn Seed & Topdressing Formula.
HOME, POOL & GARDEN Total Grass Seed Required 32.5 lbs Total Grass Seed Cost ($) $146.25 Lawn Seed & Topdressing • Component Waterfall Total Grass Seed Required 32.5 lbs Total Grass Seed Cost ($) $146.25 Topdressing Compost Volume 5.02 cu yd Starter Nitrogen Needed (0.9 l 5.85 lbs N
Graph 2 • Total Grass Seed Required Across Lawn Area Sq Ft Sweep (40% → 160%) Evaluates SeedLbs = (LawnSqFt / 1000) × SeedRatePer1000; TopdressingCuYd = (Lawn across 7 operating points (current input highlighted).
0 lbs 28.60 lbs 57.20 lbs 13 2.6ksq ft 19.50 3.9ksq ft 26 5.2ksq ft 32.50 6.5ksq ft 39 7.8ksq ft 45.50 9.1ksq ft 52 10.4ksq ft
Graph 3 • Joint Sensitivity: Lawn Area Sq Ft × Seed Rate Lbs Per1000 Sq Ft Compares Total Grass Seed Required when Seed Rate Lbs Per1000 Sq Ft is shifted +25% (solid) vs. −25% (dashed).
0 lbs 29.05 lbs 58.09 lbs --- Seed Rate Lbs Per1000 Sq Ft @ 75% 28.44 -30% 34.53 -15% 40.63 +0% 46.72 +15% 52.81 +30%
Summary: Seeding 6,500 sq ft at 5 lbs/1,000 sq ft requires 32.5 lbs of grass seed ($146.25) and 5.02 cubic yards of 0.25" topdressing compost.
Summary: Seeding 6,500 sq ft at 5 lbs/1,000 sq ft requires 32.5 lbs of grass seed ($146.25) and 5.02 cubic yards of 0.25" topdressing compost.
⚡ Send result to: ROI Calculator →Percentage →
Interactive chart & math engine powered by CalculatorGraph

Formula & Mathematical Methodology: Lawn Seed & Topdressing Formula

SeedLbs = (LawnSqFt / 1000) × SeedRatePer1000
TopdressingCuYd = (LawnSqFt × (DepthInches / 12)) / 27
SeedLbs = (LawnSqFt / 1000) × SeedRatePer1000; TopdressingCuYd = (LawnSqFt × (DepthInches / 12)) / 27
  • lawnAreaSqFt: Total lawn area to seed or overseed in square feet.
  • seedRateLbsPer1000SqFt: Seed application rate per 1,000 sq ft (4–5 lbs overseeding, 8–10 lbs bare soil tall fescue).
  • topdressingDepthInches: Compost topdressing depth in inches (0.25 in standard for overseeding).
  • seedPricePerLb: Grass seed cost per pound ($/lb).

Rounding: Internal floating-point calculations preserve full precision; currency and percentage outputs round to 2 decimal places.

Worked Example: Lawn Seed & Topdressing Worked Example

Compute grass seed lbs, nitrogen lbs, and topdressing cubic yards per 1,000 sq ft.

  1. Enter your operational, financial, or physical measurement inputs.
  2. Apply the standard domain equation: SeedLbs = (LawnSqFt / 1000) × SeedRatePer1000; TopdressingCuYd = (LawnSqFt × (DepthInches / 12)) / 27.
  3. Review the primary result, sensitivity metrics, and 3 interactive SVG graphs.
Result: Calculates Lawn Seed & Topdressing via SeedLbs = (LawnSqFt / 1000) × SeedRatePer1000; TopdressingCuYd = (LawnSqFt × (DepthInches / 12)) / 27.

Frequently Asked Questions

How does the Lawn Overseeding Grass Seed (lbs), Starter Fertilizer & Topdressing Soil Calculator calculate results?

It computes SeedLbs = (LawnSqFt / 1000) × SeedRatePer1000; TopdressingCuYd = (LawnSqFt × (DepthInches / 12)) / 27 directly in your browser and updates three custom SVG visualizations in real time.

Can I use Goal Seek to solve backwards for any input variable?

Yes. Click "🎯 Goal Seek" in the results toolbar to solve backwards for any input parameter.

Are my business and personal numbers kept private?

Yes. All calculations execute 100% locally in your browser with zero server transmission.

Everyday Life · Home, Pool & Garden

Lawn Overseeding Grass Seed (lbs), Starter Fertilizer & Topdressing Soil Calculator: inputs, method, and how to read the result

Compute grass seed lbs, nitrogen lbs, and topdressing cubic yards per 1,000 sq ft.

Choose inputs for the case you are checking

The defaults are illustrative. Replace them with values for your case and keep the units shown beside each field.

  • Lawn Area Sq Ft: Total lawn area to seed or overseed in square feet.
  • Seed Rate Lbs Per1000 Sq Ft: Seed application rate per 1,000 sq ft (4–5 lbs overseeding, 8–10 lbs bare soil tall fescue).
  • Topdressing Depth Inches: Compost topdressing depth in inches (0.25 in standard for overseeding).
  • Seed Price Per Lb: Grass seed cost per pound ($/lb).

What the calculation includes

With the default values shown, Total Grass Seed Required is 32.5 lbs. The calculation follows Lawn Seed & Topdressing Formula; the formula and variable definitions above show how the inputs combine.

One-input check: With the other defaults held constant, changing Lawn Area Sq Ft from 6,500 sq ft to 7,150 sq ft changes Total Grass Seed Required from 32.5 lbs to 35.75 lbs. This is a comparison inside the calculator's stated model, not a prediction.

Where to use caution

  • Uses industry-standard APICS/ASCM supply chain, lean manufacturing, and consumer physics formulas.
  • Actual commercial freight tariffs, marketplace commissions, and utility rates vary by carrier and contract.

Scope: Global Supply Chain, Business & Consumer Standard Check the assumptions and limitations against your situation before relying on the estimate.

More in Everyday Life: ROI Calculator (Return on Investment), Percentage Calculator.