All Calculators
Soil Volume
Raised beds, pots, garden beds
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Soil Needed
—
cubic feet
Cubic yards—
Litres—
40 L bags needed—
1 cu ft bags needed—
Order 10–15% extra to account for settling.
Lawn Fertilizer
Nitrogen coverage by lawn size
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Fertilizer Needed
—
bags
Lawn area—
Total fertilizer (lbs)—
Nitrogen delivered (lbs)—
Apply when grass is actively growing. Water in after application.
Seed Spacing
Plants per bed, row layout
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Plants / Seeds Needed
—
plants
Bed area—
Packets needed—
Spacing method—
Add 15% extra seeds for germination failure and thinning.
Rainwater Collection
Barrel size, roof catchment
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Water Collected
—
gallons per rainfall event
Litres collected—
Catchment area—
Rain barrels needed (55 gal)—
Actual collection varies with gutter efficiency and first-flush diverters.
Compost Ratio
Browns vs greens C:N balance
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Estimated C:N Ratio
—
carbon to nitrogen
Ideal range25:1 – 35:1
Status—
Adjustment needed—
Too much nitrogen = smelly pile. Too much carbon = slow decomposition.
Mulch Coverage
Bags or bulk yards needed
+
Mulch Needed
—
cubic yards (bulk)
Cubic feet—
2 cu ft bags—
3 cu ft bags—
Keep mulch 2–3" away from plant stems and tree trunks.
Drip Irrigation
Emitters, flow rate, run time
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Daily Run Time
—
minutes per day
Total emitters—
System flow rate—
Total water per day—
Water in the early morning to reduce evaporation. Adjust for rainfall.
Tree & Shrub Spacing
How many plants for your space
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Plants Needed
—
trees / shrubs
Per row—
Total rows—
Area covered—
Add 10% extra for losses. Check mature spread before finalizing spacing.
Lawn Overseeding
Seed quantity by grass type
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Seed Needed
—
pounds of seed
Lawn area—
Seeding rate used—
Overseed in early fall for cool-season grasses, late spring for warm-season. Keep soil moist until germination.
Pool Chemical Calculator
Chlorine, pH, alkalinity
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Treatment Needed
—
—
Pool volume—
Pool volume (litres)—
⚠️ Always test water before adding chemicals. Add chemicals with pump running. Never mix chemicals together.
Vegetable Planting Guide
Spacing, depth & days to harvest
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Watering Schedule
Sprinkler run time by area
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Run Time Per Session
—
minutes
Zone area—
Weekly water total—
Gallons per session—
Water early morning to reduce evaporation. Adjust for rainfall — skip sessions after ½" or more of rain.