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ReefDose Card

UK reef dosing calculator / label arithmetic

Measure first.
Dose from the label.

Already chosen product and target? ReefDose checks how one raising-product label scales to net water, shows arithmetic, and splits total only when label supplies a maximum.

Open calculator Try worked example
£29 onceNo subscriptionStored on this device
Reef aquarium beside a fictional 16 ml alkalinity dose card
Fictional sampleALK · dKH
16 ml total

From 7.2 → 8.0 dKH in 200 L

Three stepsLabel cap · 6 ml
  1. Step 016 ml
  2. Step 026 ml
  3. Step 034 ml
Each rail uses supplied 6 ml label maximum

Plain-language product answer

What does ReefDose Card calculate?

ReefDose Card is a deterministic reef dosing calculator for UK keepers who already chose a product and target. It takes net water volume, a fresh measured value, the keeper’s chosen target, and a raising rule copied from a supplement label. ReefDose scales the label amount by water volume and required correction, then shows every term in the arithmetic. When the keeper supplies a manufacturer-stated maximum, the tool divides the total into capped portions; when no maximum appears on the label, it shows the total and withholds portions. It supports alkalinity, calcium, magnesium, nitrate, and phosphate for one tank, with litres, UK gallons, or US gallons. It does not recommend targets or products, interpret chemistry, diagnose livestock, automate pumps, or promise an outcome. Tank details and completed-card history remain in the browser. The paid calculator costs £29 once, with no account or subscription, and can export a versioned evidence receipt after the keeper verifies each source value.

Reviewed by on against deterministic formula tests and live product output.

Worked correction / every term visible

Follow one correction.

Fictional label: 10 ml raises alkalinity by 1 dKH in 100 L, with a supplied 6 ml manufacturer maximum. ReefDose does not interpret whether that limit applies per dose, per day, or another period.

  1. 01Tank
    200 L net

    Water after rock and displacement

  2. 02Test
    7.2 dKH

    Fresh measured alkalinity

  3. 03Target
    8.0 dKH

    Chosen by keeper, not ReefDose

  4. 04Label
    10 ml · +1 dKH · 100 L

    Exact product rule · 6 ml maximum

  5. 05Arithmetic
    10 × 2 × 0.8

    Label × water scale × correction scale

  6. 06Portions
    6 + 6 + 4 ml

    16 ml split by copied label cap

Visible working10 ml × (200 L ÷ 100 L) × ((8.0 − 7.2) dKH ÷ 1 dKH) = 16 ml

Test 01 / Label 02 / Dose 03 / Proof 04

One correction ledger, from fresh test to verified record.

Keep sources beside arithmetic. ReefDose remembers your test and label rules, calculates proportion and split, then asks you to verify every input before saving.

01

Fresh test trail

Keep recent tank measurements on this device, then reuse the exact value you tested.

02

Label shelf

Save keeper-entered product rules: amount, effect, reference volume, source, and cap.

03

Capped correction

Calculate five reef parameters and split the total into label-capped steps.

04

Verified record

Match tank, test, target, label, and cap before saving a local evidence receipt.

Supported / 05

Five parameters. One label rule.

  • Alkalinity
  • Calcium
  • Magnesium
  • Nitrate
  • Phosphate

Narrow job

Use ReefDose when

  • You have a fresh test result.
  • You already chose product and target.
  • Raising-product label states amount, effect, and reference volume.
  • You want to inspect scaling before using product.

Different job

Use another tool when

  • You need target or product recommendations.
  • You need to lower a parameter.
  • You need reminders or recurring schedules.
  • You need pump or dosing-hardware automation.

Non-negotiable limits

Calculates dose. Never chooses it.

No target recommendation. No product recommendation. No diagnosis, livestock advice, or invented schedule. If a manufacturer maximum is missing, ReefDose shows total amount and withholds steps.

INPUT STANDARD“X ml or g raises Y units in Z litres”

Copied from your supplement label, including source and cap.

One-time licence

£29 once.

Five parameters. Fresh-test trail. Saved label rules. Verified receipts. No account or subscription.

Open calculator Inspect fictional sample first

ReefDose Card is an independent arithmetic tool from Wolven Tech Advisory Ltd. It is not affiliated with Red Sea or any supplement or dosing-hardware brand.