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ReefDose

Reef dosing calculator guide

Scale one copied label rule.

ReefDose Card turns one keeper-entered test, chosen target, net water volume, and raising-product label into inspectable arithmetic. No product catalogue. No target recommendation. No invented maximum.

Answer first

How does a reef dosing calculator use a supplement label?

A label-based reef dosing calculator starts with the effect printed on a supplement: a stated product amount raises one parameter by a stated amount in a reference water volume. ReefDose Card asks the keeper to copy that rule, enter net tank water, add a fresh measured value, and enter a target the keeper has already chosen. It converts tank and label volumes to litres, scales the label amount by the water-volume ratio, then scales again by target minus measurement divided by the label-stated increase. Result shows total dose and every substituted term. If keeper enters a manufacturer-stated maximum, ReefDose divides total into portions no larger than that maximum. If no maximum appears on label, ReefDose shows total but withholds portions. Tool supports raising rules for alkalinity, calcium, magnesium, nitrate, and phosphate. It does not decide target, assess livestock, or create dosing advice.

Deterministic formula

What arithmetic does ReefDose show?

total dose = label dose amount × (tank litres ÷ label reference litres) × ((chosen target − measured value) ÷ label-stated increase)

What inputs are required?

  • Net aquarium water volume after displacement
  • Fresh measured value and target already chosen by keeper
  • Label dose amount and its stated parameter increase
  • Label reference volume and matching units
  • Manufacturer maximum, when label supplies one

When should another tool be used?

  • When keeper needs target or product recommendations
  • When parameter must be lowered rather than raised
  • When label rule cannot fit amount, effect, and volume
  • When recurring schedules or pump control are required

Fictional worked path

Why does sample total equal 16 ml?

Fictional label says 10 ml raises alkalinity by 1 dKH in 100 L. Tank contains 200 L net water. Keeper enters 7.2 dKH measured and 8.0 dKH chosen target. Water ratio is 2; correction ratio is 0.8. Therefore 10 × 2 × 0.8 = 16 ml. Supplied 6 ml maximum produces three displayed portions: 6 ml, 6 ml, and 4 ml. Example demonstrates arithmetic only; it is not a recommendation for any tank or product.

Inspect worked example

Reviewed source

Wolven Tech Advisory Ltd

Published and reviewed 28 August 2026 against deterministic formula tests and live output. UK company number 16811183. Verify Companies House record.

ReefDose Card is independent and is not affiliated with Red Sea or any supplement or dosing-hardware brand.