MetraNestCopy an appropriate application rate
Use the quantity specified by the manufacturer for the relevant use. Initial sowing and overseeding do not necessarily use the same application rate. Words on the bag, such as sport or shade, are not enough to infer a universal rate. The prefilled value is only there to demonstrate how the calculation works.
Convert grams to kilograms
Multiplying the area in square metres by an application rate in grams per square metre gives grams. Dividing by one thousand gives kilograms. This step avoids confusing a small unit rate with the total weight to order. Any reserve is then applied to the total.
Compare available bag sizes
The bag count is rounded after calculating the required quantity. Try another pack size to compare the purchased surplus. If part of the ground needs a different mix or application rate, make a separate calculation. The tool does not assess the product’s suitability, soil preparation or germination conditions.
Seed in kg = area in m² × application rate in g/m² ÷ 1,000 × (1 + reserve ÷ 100). Bags = calculated kg ÷ kg per bag, rounded up.
80 m² with the application rate on your bag
Assuming 25 g/m², 80 m² require 2,000 g, or 2 kg. With no reserve and 1 kg bags, two bags are enough arithmetically. This example does not recommend this application rate for your ground.
Details to check
- Find the application rate that matches your use.
- Use only one mass unit per field.
- Keep areas requiring different mixes separate.
Frequently asked questions
Does the bag only state a coverage area?
You can find the application rate by dividing the mass in grams by the stated area, provided that area matches your intended use.
Does the calculation predict successful germination?
No. It estimates a product quantity from your inputs without predicting germination or the ground’s needs.
Method and references · Editorial review: 25 October 2026
The geometric formulas are explained here. For a product, its packaging dimensions and coverage rate remain the reference inputs.