This calculator sizes any hummingbird nectar batch for you. Choose your mix ratio, enter the amount of water you will use (or the feeder size you want to fill), and read off the exact sugar and water amounts. No math at the sink, no half-remembered recipes.
Hummingbird nectar calculator
How to use the numbers
The calculator converts cups of water into the matching sugar amount for your chosen ratio. A 1:4 mix is the year-round standard — close to the sugar concentration hummingbirds find in wildflowers. Switch to 1:3 only during heat waves above 90°F or peak fall migration, and change nectar at least daily when you do, since stronger mixes ferment faster. The full reasoning, and when not to adjust, is in our hummingbird nectar ratio guide.
Batch sizes by feeder capacity
If you would rather fill the feeder straight to its mark, match the batch to capacity. Most bottle feeders hold 16–32 ounces and saucer feeders 8–16 ounces:
| Feeder capacity | Sugar (1:4) | Water (1:4) |
|---|---|---|
| 8 oz | 2 tbsp | ½ cup |
| 16 oz | ¼ cup | 1 cup |
| 32 oz | ½ cup | 2 cups |
| 48 oz | ¾ cup | 3 cups |
How long the batch stays fresh
Batch size matters less than freshness. The schedule below assumes a shaded feeder and clean hardware:
| Daily high | Change nectar every |
|---|---|
| Above 90°F | Daily |
| 80–89°F | Every 2 days |
| 70–79°F | Every 3–4 days |
| Below 70°F | Every 5–7 days |
Our feeder-change guide explains the spoilage signs behind those intervals, and our pests guide keeps the fresh batch from becoming an insect buffet. For placement — height, shade, and window distance — see the feeder placement guide.
Three variations the calculator handles for you
Half batches divide every value in the table by two, so an 8-ounce feeder takes 2 tablespoons of sugar in half a cup of water. Multiple feeders: add the capacities together, size one batch, and split it. Metric mode: the gram output works with any kitchen scale, and 1 gram of sugar per 4 milliliters of water is the same 1:4 recipe by weight. Orioles are the one bird the 1:4 recipe does not serve — they prefer a weaker 1:6 mix, covered in our oriole guide.
Only white sugar, never the substitutes
Whatever the batch size, the sugar is always plain refined white sugar. Honey ferments into a fungus-friendly soup, brown and raw sugars carry iron, artificial sweeteners offer zero calories, and dyed commercial nectar adds nothing but cost. If you keep only one kind of sugar in the house for the birds, this is it.
Want the birds’-eye view of what nectar does for them? Cornell Lab’s Ruby-throated Hummingbird guide covers their diet across the seasons, and the Smithsonian Migratory Bird Center’s hummingbird feeding fact sheet is the best one-page reference on safe feeding.
