A GUIDE TO THE NUMBERS
From lawn area
to seed bags.
Seedcount connects a measured area to the application rate you enter. It then turns that weight into full bags and, optionally, an order total based on your quote.
1. Add areas you intend to seed
Measure each rectangular patch in metres. Multiply its length by its width to get square metres, then add the patch areas. A lawn with separate front and rear sections can be entered as two rows.
For an irregular outline, divide it into smaller rectangles that approximate the area. These are planning measurements: angled edges, curves and obstacles can make a rectangular approximation less precise. Avoid overlapping sections or counting paths and existing garden beds as lawn.
Total area = sum of the patch areas
If your area is already known, entering that area as the length and 1 m as the width gives the same square-metre total. Make the patch name clear so you remember that the row represents a known area.
2. Enter the rate for your actual product
The calculator expects grams per square metre (g/m²). Product instructions may distinguish between starting a new lawn and overseeding an existing one. Enter the applicable rate, rather than copying a generic figure.
If your label supplies a weight for a stated area, divide the weight in grams by that area in square metres. For example, a hypothetical instruction of 1 kg for 50 m² would be 1,000 ÷ 50 = 20 g/m². That is a unit-conversion example, not a seed recommendation.
Seed (kg) = seed (g) ÷ 1,000
3. Keep any extra quantity visible
An extra allowance increases the planned buying quantity by a percentage you choose. Leaving it at 0 adds nothing. Seedcount does not decide whether you need extra seed or how much.
Extra quantity can represent seed you want to hold back, but it does not change your product's application instructions or establish a germination rate. The calculator applies the allowance once, after summing all patch areas.
4. Round up to bags you can actually buy
Use the seed weight stated on the bag, in kilograms. A 500 g bag is 0.5 kg; a 2,000 g bag is 2 kg. Seedcount divides the planned kilograms by that bag weight and rounds the count up to a whole number.
The combined bag weight can exceed the calculated quantity. That difference is shown as “seed above planned quantity.” It is a purchasing difference, rather than an instruction to spread all purchased seed on the measured area.
Purchased kg = whole bags × kg per bag
Seed above plan = purchased kg − planned kg
A complete worked example
Every value below is hypothetical and illustrates the calculation only.
| Input or result | Example |
|---|---|
| Two measured patches | 8 × 5 m and 10 × 4 m |
| Total lawn area | 40 + 40 = 80 m² |
| Example entered seed rate | 20 g/m² |
| Base seed quantity | 80 × 20 = 1,600 g |
| Example chosen extra allowance | 10% |
| Planned seed including allowance | 1,600 × 1.10 = 1,760 g = 1.76 kg |
| Example bag size | 1 kg |
| Whole bags | Round up 1.76 ÷ 1 = 2 bags |
| Seed in those bags | 2 kg |
| Seed above planned quantity | 2 − 1.76 = 0.24 kg |
5. Add your own quote if you want a cost
A bag price is optional. With it blank, Seedcount gives you quantities without inventing a price. If you enter a price, the bag subtotal uses the rounded whole-bag count. Delivery is added once to the order, not once per bag.
Using the example's two bags, a hypothetical A$14 per bag plus A$8 delivery would total A$36. These are invented numbers for the example, not current retailer prices.
Enter prices consistently. Include GST in your quoted figures if you want a GST-inclusive result; the calculator does not add tax, discounts or surcharges separately. A blank delivery field means zero in the calculation, so check whether delivery is actually free before relying on that total.
Keep the plan useful
Download the plan or print it when the result is valid. The saved information includes your measured patches, entered rate, allowance, bag weight, rounded bag count and any quote. Measurements remain estimates, and the result is only as suitable as the product instructions and measurements you supply.