Plant Care
- • Climate Control & VPD16
- • Disease & Pest Management14
- • Nutrient Solutions & EC34
- • Plant Health Monitoring7
Nutrient Cost Optimizer
Bulk Mixing & Recycling Blueprint
Plan the per-cycle cost of running a hydroponic reservoir: the liters of nutrient solution you actually mix, the make-up water after evaporation, a full mix bill (nutrient liters × price, water × water cost, pH adjustment), and how buying concentrate in bulk plus recycling the solution change the bottom line. Enter reservoir volume, EC target and your local prices; the model returns total cost per cycle, cost per liter and cost per day with a savings verdict. It is a deterministic planning aid, not a quote — validate every line against your own prices.
Net cost per cycle
live
net cost
$28.94
Mix bill
$22.35
Water cost
$0.55
pH adjustment
$2.00
Labor & time
$20.00
Bulk savings
$4.47
Recycling savings
$8.94
Dashed arc — the share of the gross bill recycling and bulk orders cut back. Net holds in the centre.
Inputs
12 parameters · live recalculation on every change
L
10L
200L default
10000L
MS/CM
0.5mS/cm
1.8mS/cm default
4mS/cm
$/L
0.01$/L
0.05$/L default
1$/L
$/L
0$/L
0.001$/L default
0.1$/L
DAYS
30days
90days default
365days
Pro Settings — Lab Controls
×
0.5×
1× default
2×
%/DAY
0%/day
5%/day default
30%/day
$/L
0$/L
0.01$/L default
0.5$/L
Advanced Settings — Deterministic Corrections
%
0%
20% default
50%
%
0%
50% default
90%
%
0%
10% default
50%
$/CYCLE
5$/cycle
20$/cycle default
100$/cycle
Insight band · live
From mix bill to net cycle cost
The gross mix bill, built up by labor and pulled back down by bulk and recycling — the running total lands on the net cost per cycle.
- Mix bill $22.35 $22.35
- + Labor & time $20.00 $42.35
- − Bulk savings $4.47 $37.88
- − Recycling savings $8.94 $28.94
- Net cost per cycle $28.94 $28.94
Net cost: $0.145 $/L
Per day: 0.3 $/day
Total savings: $13.41 $
Running total after each term — the final net matches the headline reading in the result card, kept in sync live.
Deterministic model
12 inputs · 12 outputs
Runs 100% in your browser
This is a deterministic model: the same inputs always produce the same outputs, calculated entirely in your browser with nothing sent to any server. It is a planning aid — not a quote, not a dosing instruction, and not a yield forecast. Treat every line as a working estimate and validate it against your own prices and measurements.
It models one system: Plan the per-cycle cost of running a hydroponic reservoir: the liters of nutrient solution you actually mix, the make-up water after evaporation, a full mix bill (nutrient liters × price, water × water cost, pH adjustment), and how buying concentrate in bulk plus recycling the solution change the bottom line. Enter reservoir volume, EC target and your local prices; the model returns total cost per cycle, cost per liter and cost per day with a savings verdict. It is a deterministic planning aid, not a quote — validate every line against your own prices.
What the Nutrient Cost Optimizer returns
The engine computes 12 outputs from your 12 inputs. The headline number is Total Cost / Cycle ($), alongside Cost / Liter, Bulk Savings, Recycling Savings. Every output updates live as you change a parameter.
What it does not do
Outputs depend on the inputs and assumptions shown here. Confirm relevant measurements and local conditions before acting.
STEP 01
Enter the reservoir volume, EC target and price per liter — nutrient liters = V × EC × concentration factor × (1 + waste/100).
STEP 02
Let evaporation compound across the cycle and apply the recycling rate: make-up water = V × (1 + evap × days/100) × (1 − recycling/100).
STEP 03
Build the mix bill: nutrient liters × price, water liters × water cost, plus pH adjustment on the standing volume.
STEP 04
Apply the bulk discount off the mix bill and the 80% recycling recovery credit to get bulk savings and recycling savings.
STEP 05
Add labor as a real undiscounted line, subtract total savings from the mix bill, then divide by volume and days for cost per liter and cost per day.
STEP 06
Read the verdict off savings % (of mix cost) and net cost per liter — green above 20% savings, red under 10% or past $0.25/L.
N = V \cdot EC \cdot f_c \cdot \left(1 + \frac{w}{100}\right)
Nutrient solution to mix — volume × EC × concentration factor
W = V \cdot \left(1 + \frac{e \cdot D}{100}\right) \cdot \left(1 - \frac{R}{100}\right)
Make-up water — evaporation compounds, recycling trims it
C_{mix} = N \cdot p_N + W \cdot p_W + V \cdot p_{pH}
Mix bill — nutrient liters, water liters, pH adjustment
C_{bulk} = C_{mix} \cdot \left(1 - \frac{d}{100}\right)
Bulk cost — stock discount off the mix bill
S_{bulk} = C_{mix} \cdot \frac{d}{100}
Bulk savings — the discount line
S_{rec} = C_{mix} \cdot \frac{R}{100} \cdot 0.8
Recycling savings — 80% recovery credit
S = S_{bulk} + S_{rec}
Total savings — bulk plus recycling
C_{net} = C_{mix} + C_{labor} - S, \qquad \frac{C_{net}}{V},\ \frac{C_{net}}{D}
Net cost — labor on top, savings off the mix
Concentration factor
1.0×
your stock strength versus the EC target
Evaporation
5%/day
typical recirculating-room average — set from your room
Recycling credit
80%
assumes ~20% loss to pumping, filtration and flushing
Waste allowance
10%
spills, root-zone flushes and drift
Dose to net reservoir volume, not the stamped tank — every cost line scales from the net capacity you actually fill.
Nutrient liters scale with EC: a 1.8 mS feed mixes more concentrate than a 1.0 mS one at the same volume.
Evaporation is the quiet line: 5%/day over a 90-day cycle replaces about 4.5× the standing volume in make-up water before recycling trims it.
Recycling savings carry an 80% credit — pumping, filtration and flushing leak roughly a fifth of what a recirculating loop recovers.
Labor sits on the bill undiscounted: only the mix bill gets the bulk and recycling haircuts.
Cost per liter is the honest cross-check. The same total spread over a bigger reservoir looks cheaper per liter — compare like for like.
- Resh, H. M., Hydroponic Food Production (2022). CRC Press (8th ed.).
- Sonneveld, C. & Voogt, W., Plant Nutrition of Greenhouse Crops (2009). Springer.
- Savvas, D. & Passam, H. C. (eds.), Hydroponic Production of Vegetables and Ornamentals (2002). Embryo Publications.
- Bugbee, B., Nutrient management in recirculating hydroponic culture (2004). Acta Horticulturae 648, 99–112.
This model builds on the earlier nutrient cost calculator.
Q1: How to calculate nutrient cost per liter? ▾
Nutrient cost per liter is the mix bill divided by reservoir volume. First find the nutrient liters = volume × EC × concentration factor × (1 + waste/100), then add the make-up water liters and the pH line into the mix bill. Add labor, subtract bulk and recycling savings, and divide the net by reservoir volume.
Q2: What is a bulk nutrient mixing calculator? ▾
A bulk nutrient mixing calculator prices the whole cycle at your stock-order discount instead of dose-by-dose. This one applies bulk cost = bill × (1 − discount/100) to the mix bill. At a 20% bulk discount the bulk savings line is exactly 20% of the mix bill before recycling is counted — which is how ordering concentrate in drums beats buying it by the bottle.
Q3: How much does nutrient solution recycling save? ▾
Recycling savings = mix bill × (recycling rate/100) × 0.8. The 80% credit exists because recirculating pumps, filtration and periodic flushing leak about a fifth of the recovered solution. On the defaults a 50% recycling rate saves 40% of the mix bill, and because recycling also trims the make-up water line it cuts the bill twice: less water to buy AND less nutrient to remix.
Q4: What is a hydroponic nutrient cost optimizer? ▾
A hydroponic nutrient cost optimizer is the P&L for your fertilizer bill. It converts reservoir volume, EC target and price per liter into the exact liters to mix, the make-up water after evaporation, a full mix bill, and then applies the bulk discount and recycling recovery to return total cost per cycle, cost per liter and cost per day.
Q5: Why is EC target important for nutrient cost? ▾
EC target drives the nutrient liters you must mix: N = V × EC × concentration factor. Double the EC and you roughly double the concentrate used at the same volume, so dosing strength is the single biggest lever on the mix bill.
Q6: How do I calculate my hydroponic cost per day? ▾
Cost per day is net cycle cost ÷ days, where net cost = mix bill + labor − (bulk savings + recycling savings). Evaporation makes the daily spend climb as the cycle runs, but the savings lines subtract once for the whole order, so long cycles spread the same bulk bill thinner per day.
Ideal recommended settings
Defaults tune the model to a working recirculating reservoir. Rows update live with your inputs.
Reservoir volume
200 L
net tank capacity you dose to
EC target
1.8 mS/cm
conductivity the crop runs at
Bulk order discount
20 %
whole-cycle concentrate order
Recommended
Check your bulk order first
On the defaults, bulk savings already cut $4.47 off the mix bill. Order concentrate for the whole cycle before you touch labor or recycling targets.
Recycle the solution before you resize the tank
A 50% recycling rate trims make-up water by that exact share and credits $8.94 back to the bill.
Read cost per liter, not just the total
Net cost sits at $0.145 per liter on the defaults. If it climbs past $0.25/L, reprice inputs before scaling the reservoir.