← All calculators

Fertiliser Calculators

Work out exactly how much lawn product you need — from liquid feeds and bio-stimulants to granular fertilisers, colourants and wetting agents. Pick a product below, enter your lawn area, and the calculator does the rest.

Pure Balance

Balanced NPK liquid fertiliser for general lawn feeding. Use as a regular boost through the growing season for healthy, even colour and dense growth.

See what size bottle you need
Pure Balance 15-1-5 Lawn Fertiliser

Pure Iron+

Iron-rich liquid fertiliser. Deep greens up the lawn without flush growth, hardens turf for stress periods, and improves overall colour.

See what size bottle you need
Pure Iron+ Lawn Fertiliser

Pure Seaweed+

Seaweed-based bio-stimulant. Supports root development, stress tolerance and recovery. Ideal through winter and stress periods, or paired with regular feeding.

See what size bottle you need
Pure Seaweed+ Lawn Fertiliser

Pure Colour

Liquid turf colourant for instant green. Perfect for events, photos, or hiding off-colour patches while waiting for the lawn to recover. Lasts 8–12 weeks.

See how far a bottle will go
Pure Colour - Lawn Pigment

Pure Wetter

Soil wetting agent. Fixes hydrophobic soil and improves water, fertiliser and pesticide penetration. Essential for sandy soils and dry patches.

See what size bottle you need
Pure Wetter - Lawn Wetting Agent

Dominate

Granular slow-release lawn fertiliser. Long-lasting feed for sustained growth and colour through the season — easy to apply with a spreader.

See what size you need
Dominate - Granular Fertiliser

Dominate Mini

Mini-prill version of Dominate. Smaller particle size for fine-leaf lawns and even spread. Same long-lasting granular feed.

See what size you need
Dominate Mini - Granular Fertiliser

Proliferate

Granular lawn fertiliser. A balanced granular feed for strong, consistent growth across all turf types.

See what size you need
Proliferate - Granular Fertiliser

Proliferate Mini

Mini-prill version of Proliferate. Smaller particle size for fine-leaf lawns and even spread. Same balanced granular feed.

See what size you need
Proliferate Mini - Granular Fertiliser

Liquid Fertiliser FAQ

How often should I apply liquid fertiliser?

Most liquid lawn fertilisers are designed to be applied every 4–6 weeks during the growing season. Adjust based on rainfall, mowing frequency and how your lawn is looking — a faded or pale lawn usually wants more, a fast-growing dark green lawn can stretch the interval.

Should I water in liquid fertiliser?

Yes — a light watering after application washes the product off the leaf and into the root zone. Avoid applying just before heavy rain (it'll wash off entirely) and avoid in the heat of the day (risk of leaf burn).

Pure Balance vs Pure Iron+ vs Pure Seaweed+ — what's the difference?

Pure Balance is a balanced NPK feed for general nutrition and growth. Pure Iron+ is iron-rich for colour and hardening — use it to deepen the green without pushing leaf growth. Pure Seaweed+ is a bio-stimulant — supports root development, stress tolerance and recovery rather than direct feeding. Many lawn programs rotate all three through the season.

Can I tank-mix liquid fertilisers with other products?

Generally yes — Pure Balance and Pure Iron+ are compatible with most lawn herbicides, fungicides and wetters. Always do a small jar test first if you're combining several products, and refer to each product label for incompatibilities.

How much will one bottle cover?

Use the calculator above — enter your lawn area and it'll show how many applications you'll get out of one bottle at the selected rate.