How this calculator works
Cylinder volume = π × (diameter ÷ 2)² × height. Cube volume = width² × height. The packet count is the water volume divided by the dosage printed on your packet, rounded up to the nearest quarter packet.
Every figure is calculated in your browser from the values you enter, so nothing is sent anywhere and you can adjust the inputs freely to match your own quote.
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Frequently asked questions
How much flower food do I add to the water?
Follow the dosage on your own packet — it states how much water one sachet treats, and that varies by brand. This calculator uses whatever figure you enter, so it stays correct for your product instead of assuming a universal ratio.
How do I know my vase's water volume?
Measure the height the water reaches and the vase's width, choose the closest shape, and the calculator will estimate the volume. If you already know the volume, switch to 'I already know the volume' and enter it directly.
Can I use less than a full packet?
For a small vase, yes — mix a fraction of a packet in the water and keep the remainder sealed for the next change. The calculator rounds up to the nearest quarter packet as a practical measure.
How often should I refresh the water and food?
Change the water, re-cut the stems, and re-dose the food every couple of days, or sooner if the water clouds. Fresh solution and a clean cut are what keep the stems taking up water.