About this calculator
Work out lawn fertiliser from the bag’s application rate.
How it’s calculated
Product (kg) = area (m²) × rate (g/m²) ÷ 1,000. The default of 50 g per m² is the spring rate in Kynoch’s application table for TurboGrass (35 g per m² in summer and autumn, every 3 to 4 weeks). The same product page also gives 25 g per m² in its FAQ, and its bag coverage (10 kg for 500 m²) works out to 20 g per m², so follow the rate printed on your bag.
Worked example
With these inputs:
- Area shape
- Rectangle
- Length
- 15 m
- Width
- 10 m
- Application rate (g per m²)
- 50
- Bag size
- 10 kg
the result is:
- Product needed
- 7.5 kg
- Bags
- 1 × 10 kg
Tips from the trade
- Calibrate the spreader on a driveway first.
- Apply in two passes at right angles to avoid stripes.
Results are estimates for planning and pricing. Check quantities against your drawings, the manufacturer’s data and SANS 10400 (the National Building Regulations) and your local municipality before ordering.