3D Printing Fertiliser Calculator Examples
Worked examples showing fertiliser concentrate calculations for 3D-printed planters, hydroponic pots, and multi-planter reservoirs.
These examples show how reservoir size, planter count, product dilution, and refill timing affect the amount of fertiliser concentrate to mix. Always use the dilution rate stated on your own fertiliser product label.
Small desktop herb planter
One basil planter has a 0.8 L usable reservoir and is filled using a 1.5 mL-per-litre fertiliser dose.
Input Summary
Reservoir volume per planter
0.8 L
Fertiliser dose
1.5 mL per L
Number of planters
1
Refill interval
5 days
Calculation Breakdown
- 1Total solution volume0.8 L × 10.8 L
- 2Fertiliser per refill0.8 L × 1.5 mL per L1.2 mL
- 3Estimated yearly refills365 ÷ 573 refills
- 4Estimated annual use1.2 mL × 7387.6 mL
Result Summary
Estimated annual use
87.6 mL
3D Printing Fertiliser Calculator
Mix 1.2 mL of concentrate into 0.8 L of water for each refill. Estimated yearly use is about 88 mL.
Four medium self-watering planters
Four 2 L 3D-printed planters use a fertiliser label rate of 2 mL per litre.
Input Summary
Reservoir volume per planter
2 L
Fertiliser dose
2 mL per L
Number of planters
4
Refill interval
7 days
Calculation Breakdown
- 1Total solution volume2 L × 48 L
- 2Fertiliser per planter2 L × 2 mL per L4 mL
- 3Fertiliser per refill8 L × 2 mL per L16 mL
- 4Estimated annual use16 mL × (365 ÷ 7)834.3 mL
Result Summary
Estimated annual use
834.3 mL
3D Printing Fertiliser Calculator
Mix 16 mL of concentrate into 8 L of water per group refill. Estimated annual use is about 834 mL.
Balcony collection with larger reservoirs
Six planters each have a 5 L usable reservoir. The product dose is 1 mL per litre and refills occur every 10 days.
Input Summary
Reservoir volume per planter
5 L
Fertiliser dose
1 mL per L
Number of planters
6
Refill interval
10 days
Calculation Breakdown
- 1Total solution volume5 L × 630 L
- 2Fertiliser per refill30 L × 1 mL per L30 mL
- 3Estimated yearly refills365 ÷ 1036.5 refills
- 4Estimated annual use30 mL × 36.51,095 mL
Result Summary
Estimated annual use
1,095 mL
3D Printing Fertiliser Calculator
Mix 30 mL of concentrate into 30 L of water per refill. Estimated annual use is about 1,095 mL.
Indoor hydroponic pot system
Three 3 L hydroponic pots use 3 mL of nutrient concentrate per litre and are refilled every four days.
Input Summary
Reservoir volume per planter
3 L
Fertiliser dose
3 mL per L
Number of planters
3
Refill interval
4 days
Calculation Breakdown
- 1Total solution volume3 L × 39 L
- 2Fertiliser per planter3 L × 3 mL per L9 mL
- 3Fertiliser per refill9 L × 3 mL per L27 mL
- 4Estimated annual use27 mL × (365 ÷ 4)2,463.75 mL
Result Summary
Estimated annual use
2,463.75 mL
3D Printing Fertiliser Calculator
Mix 27 mL of concentrate into 9 L of water per refill. Estimated annual use is about 2,464 mL.
How to Read Your Results
The total nutrient solution volume is the water amount needed to fill every listed reservoir once.
Fertiliser per planter is useful when reservoirs are filled individually rather than from one shared batch.
Fertiliser per refill is the total concentrate to measure for all planters in the calculation.
Annual fertiliser is a planning estimate based on 365 days and the entered average refill interval.
Round measuring amounts only to the precision your measuring tool can reliably deliver.
Assumptions & Important Notes
- All reservoir volumes are usable liquid capacities rather than external planter sizes.
- The selected product dose is suitable for the plants and growing system.
- Every example assumes full refills, not partial top-ups.
- The annual examples keep refill intervals constant even though real water demand can vary.
Related Examples
Frequently Asked Questions
Can I use these examples with a different fertiliser brand?
Yes. Replace the example dose with the dilution rate stated on your product label, provided it is expressed in mL per litre.
What if my planters have different reservoir sizes?
Calculate each reservoir size separately, or add their usable volumes together and multiply the total by the dose.
Why do the yearly examples include decimal refills?
365 divided by a refill interval is an average annual estimate, so it may not be a whole number.
Can I make less solution than the full refill amount?
Yes. Use the same mL-per-litre ratio for the smaller volume and only prepare what you need.
Ready to calculate your own result?
Use the live calculator with your own inputs, timing, and preferences.