How do you calculate nutrient solution to mix per day?

Multiply active canopy area by daily feed rate per square foot to get theoretical demand, then divide by dosing-system delivery efficiency. For 5,000 sq ft at 0.10 L/sq ft/day and 90% efficiency, theoretical demand is 500 L and you must mix 555.6 L.

Why mix more than the plants actually use?

Drain-to-waste systems deliberately over-irrigate to flush salts, and dosing lines bleed and lose volume to priming. The 90% efficiency default means about 55.6 L of the 555.6 L batch is the drain-to-waste and bleed-off allowance rather than uptake.

What is a good dosing-system delivery efficiency?

Well-tuned drip systems run 85 to 95 percent; flood-and-drain or sloppy emitters run lower. Higher efficiency means less mixed volume wasted, but a small over-irrigation allowance is healthy to prevent salt buildup at the root zone.

Drain-to-waste vs recirculating nutrient consumption?

Drain-to-waste mixes fresh every batch and discards runoff, so consumption matches this calculation. Recirculating systems reclaim runoff and top off, so true new-solution consumption is lower than the mixed volume shown here.

How does feed rate per square foot change with crop stage?

Seedlings might use 0.02 to 0.05 L/sq ft/day while mature fruiting plants under strong light can exceed 0.15. Re-run the calculator with the current stage's rate so your batch matches real transpiration demand.

How big a mix tank do I need?

Size the tank to at least one full day's mixed volume plus a safety margin. For this example, 555.6 L/day means a 600 to 700 L tank gives headroom for mixing and a buffer against a missed batch.

Greenhouse, Indoor Farming & Agri-Processing calculator

Nutrient mix consumption calculator

Nutrient mix consumption is the volume of nutrient solution a hydroponic or fertigation operation must mix each day to feed its canopy, after accounting for the losses and bleed-off inherent in the dosing system. Growers, irrigation techs, and crop managers calculate it to size batch tanks, schedule fertigation runs, and order salts and stock concentrate so they never run a reservoir dry mid-cycle. Because actual delivery is never 100 percent efficient, the saleable feed volume is always less than what you mix, and undersizing the batch is one of the most common causes of plant stress in drain-to-waste systems. Getting this number right keeps EC and pH stable and stops emergency top-offs that throw off a recipe.

What this calculator does

Estimate liters of A/B nutrient stock or fertigation concentrate needed to feed a hydroponic, NFT, ebb-and-flow, or drip-irrigated canopy from growing area, daily nutrient solution use per square foot, and dosing-system efficiency.
Use it when sizing a tote or batch-tank refill for the next crop cycle, checking whether on-hand stock covers a holiday weekend, or planning fertilizer purchase orders for a leafy green, herb, tomato, or cucumber program.
It computes the total nutrient solution you must mix per day by taking theoretical canopy demand and dividing by dosing-system delivery efficiency to cover bleed-off and waste.

Formula used

Theoretical daily solution required = active canopy area × daily nutrient solution use per square foot
Required nutrient solution to mix = theoretical daily solution required ÷ dosing-system delivery efficiency

Inputs explained

Active canopy area to feed:
Daily nutrient solution use per square foot:
Dosing-system delivery efficiency:

How to use the result

Use it when sizing mix tanks, scheduling fertigation batches, or ordering nutrient salts and concentrate for an upcoming crop cycle.
It assumes a constant per-square-foot feed rate, so it does not adjust for crop growth stage, transpiration swings with climate, or recirculating systems that reclaim runoff.

Current U.S. benchmarks

U.S. housing starts run at 1,177k per year (Census, May 2026), down 8.7% from a year earlier, the demand driver for building products.
Industrial natural gas averages $4.9 per Mcf (EIA, Apr 2026), down 7.7% from a year earlier, with industrial electricity at 8.66 cents per kWh. Process heating and refrigeration budgets track both.

Common questions

How do you calculate nutrient solution to mix per day? Multiply active canopy area by daily feed rate per square foot to get theoretical demand, then divide by dosing-system delivery efficiency. For 5,000 sq ft at 0.10 L/sq ft/day and 90% efficiency, theoretical demand is 500 L and you must mix 555.6 L.
Why mix more than the plants actually use? Drain-to-waste systems deliberately over-irrigate to flush salts, and dosing lines bleed and lose volume to priming. The 90% efficiency default means about 55.6 L of the 555.6 L batch is the drain-to-waste and bleed-off allowance rather than uptake.
What is a good dosing-system delivery efficiency? Well-tuned drip systems run 85 to 95 percent; flood-and-drain or sloppy emitters run lower. Higher efficiency means less mixed volume wasted, but a small over-irrigation allowance is healthy to prevent salt buildup at the root zone.
Drain-to-waste vs recirculating nutrient consumption? Drain-to-waste mixes fresh every batch and discards runoff, so consumption matches this calculation. Recirculating systems reclaim runoff and top off, so true new-solution consumption is lower than the mixed volume shown here.
How does feed rate per square foot change with crop stage? Seedlings might use 0.02 to 0.05 L/sq ft/day while mature fruiting plants under strong light can exceed 0.15. Re-run the calculator with the current stage's rate so your batch matches real transpiration demand.

Last reviewed 2026-05-12.