Bee Syrup Calculator

The two standard ratios are 1:1 (one part sugar to one part water, by weight) for spring stimulation and 2:1 (two parts sugar to one part water, by weight) for fall feeding to build winter stores. In short, the standard sugar syrup ratio for feeding bees is 1:1 in spring and 2:1 in fall — and this feeding-bees sugar water ratio is always measured by weight, not volume. Use 1:1 in spring to mimic a nectar flow and encourage brood rearing; use 2:1 in fall because it carries twice the sugar per trip and the bees have less water to evaporate before capping it. Always measure by weight — a kitchen scale beats cups for repeatability. The ratio lab above shows the exact Brix and density of each mix.

For 1 finished gallon of 1:1 syrup (by weight), dissolve 5.13 lb (2.33 kg) of white granulated sugar into 5.13 lb of water — about 2.46 quarts of water by volume. This is the standard spring bee syrup recipe. Stir into hot (not boiling) water until fully clear. Note that sugar takes up volume when dissolved: this recipe yields exactly 1 gallon of finished syrup because it is computed from the syrup density of 1.23 kg/L. The batch mixer above scales this to any batch size, from a single quart to a 55-gallon drum.

For 1 finished gallon of 2:1 syrup (by weight), dissolve 7.38 lb (3.35 kg) of white granulated sugar into 3.69 lb (1.67 kg / 0.44 gal) of hot water. This is the standard fall bee sugar syrup recipe. Heat the water first, remove from heat, then stir the sugar in until completely dissolved — 2:1 is just below the saturation point (67.1% at room temperature), so undissolved crystals will seed crystallization as it cools. One finished gallon of 2:1 carries about 7.4 lb of sugar, which the bees dry down to roughly 9 lb of capped winter stores.

By weight. Sugar and water have very different densities, so volume ratios drift: the classic "2:1 by volume" (2 cups sugar to 1 cup water) is actually only about 1.69:1 by weight, since a cup of sugar weighs 200 g but a cup of water weighs 237 g. Beekeepers call 1:1 thin sugar syrup for bees and 2:1 thick sugar syrup for bees — the names describe sugar concentration, not pourability. Bees will happily take either concentration, but if you want a true 2:1 that maximizes stores per gallon, weigh it. The honesty box in the ratio lab converts any cup-measured recipe to its true by-weight ratio.

It depends on your climate and how much honey is already in the hive. As planning defaults: northern US/Canada about 6 gallons of 2:1 per hive, the UK and continental Europe about 4 gallons, the southern US about 2.5 gallons, and Australia/NZ about 2 gallons. A rule of thumb for how much syrup to feed bees in fall: keep feeding 2:1 until the hive reaches its target winter weight — hefting beats any table. One gallon of finished 2:1 syrup becomes roughly 9 lb of capped stores after the bees evaporate it. The feeding planner above converts your hive count and region into total gallons, total sugar, and cost — or use feed-gap mode with your target and current stores per hive for an exact number.

Feed 1:1 in spring once daytime temperatures are consistently above 50 F (10 C) and stop when the nectar flow starts — never feed syrup while honey supers are on, or the "honey" will be adulterated syrup. For feeding bees in the fall, start right after the honey harvest, while bees are still flying and daytime highs stay above 50 F so they can evaporate and cap it. Typical windows: northern US Sep 1–Oct 15, UK Sep 1–Oct 15, southern US Oct 1–Nov 15, Australia Feb 15–Apr 15. Stop liquid feed when the cluster forms; switch to fondant or dry sugar for winter emergencies.

Not liquid syrup — below about 50 F (10 C) bees cannot fly to evaporate it, and the extra moisture inside the hive can chill the cluster. There is no winter bee syrup recipe: liquid feed is off the table once the cluster forms. When feeding bees in winter, use only fondant or dry sugar: fondant patties, candy boards, or the mountain camp dry sugar method (a sheet of newspaper over the top bars with dry sugar mounded on top, lightly misted). Plan about 5 kg (11 lb) of fondant per hive as a winter reserve. The planner above has a winter mode that sizes fondant from your hive count.

Bee fondant is a 4.5:1 sugar-to-water mix by weight with a splash of acid: for 10 lb (4.54 kg) of finished fondant, heat 3.71 kg of sugar with 0.82 kg of water and about 7.4 ml (1.5 tsp) of white vinegar, stirring to the soft-ball stage (234–240 F / 112–116 C), then cool and knead. Choose fondant or sugar syrup for bees by season: liquid syrup while bees are flying, fondant once the cluster forms. The fondant calculator above scales this to any batch. Do not confuse bee fondant with cake fondant, which contains ingredients bees should not have. Candy boards are the same idea pressed into a shallow frame for winter feeding.

Inverted syrup is sucrose split into glucose and fructose with gentle heat plus a little acid (about 1 g of citric acid per kg of sugar, held warm — not boiled). You do not need to invert sugar syrup for bees — most beekeepers skip it entirely, because bees invert plain sucrose syrup with no trouble, and overheated/acidic syrup can form HMF (hydroxymethylfurfural), which is toxic to bees. If you do invert, keep temperatures low and feed it promptly. The batch mixer has an optional invert mode that adds the citric acid dose to your recipe.

In the refrigerator, plain syrup keeps about 2 weeks; at room temperature only a few days in warm weather before it ferments. You can freeze it for months — thaw completely before feeding. Discard syrup that smells of alcohol or fermentation, looks cloudy with mold, or has visible slime: fermented syrup can give bees dysentery. Make only what your hives will take within a week or two, and clean feeders between refills.

Multiply total sugar by your sugar price. At $0.72/lb (an $18 twenty-five-pound bag), one finished gallon of 1:1 costs about $3.69 in sugar and one gallon of 2:1 about $5.31. A northern fall program of 6 gallons of 2:1 per hive runs about $31.89 per hive in sugar — so 8 hives cost about $255 for the season. The cost estimator above takes your price per lb, per kg, or per bag and prices any batch or full-season plan, including how many bags to buy.

Plain white sugar and water is the standard and all most colonies ever need. Adding vinegar to sugar syrup for bees is a traditional mild acidifier some beekeepers use (about a teaspoon per gallon) — optional, not required. Recipes for thymol in sugar syrup for bees exist, but evidence for benefit is thin, and thymol will not fix a starving hive faster than plain syrup will. Never add medications to syrup unless you are following a labeled treatment protocol for a diagnosed problem. When in doubt, feed plain syrup.

No — feed only plain white granulated sugar. Brown, raw, turbinado, and powdered sugars contain molasses solids and higher ash content that give bees dysentery, which can kill a winter cluster. Organic or "less processed" sugar is worse for bees, not better. Likewise, never feed honey from an unknown source: it can carry American foulbrood spores. High-fructose corn syrup is used by some commercial operations, but plain white cane or beet sugar is the safe choice for small-scale beekeepers.

How to feed bees sugar syrup safely comes down to one rule: supers on = no feeding. The bees will store the syrup in the supers alongside — or instead of — nectar, and you will harvest adulterated "honey" that is partly sugar syrup. That is fraud if you sell it, and it is detectable by lab testing. Feed in spring before you super up, and in fall only after the supers come off. If a colony is starving during a flow with supers on, that is an emergency — feed, but mark those frames and do not extract them as honey.

Match the feeder to your batch plan: entrance/Boardman feeders hold about 1 quart (frequent refills, also prone to robbing), frame feeders about 1 gallon, top feeders 2–4 gallons, and inverted pails/buckets 1–2 gallons — these are the standard bee feeder gallon sizes most beekeepers plan around. Divide your season total by feeder capacity for the refill count — e.g. 48 gallons through a 2-gallon top feeder is 24 refills. Think of it as a bee feeder recipe planner: total syrup ÷ feeder size = refills. A strong colony can drain a gallon of 2:1 in a few days during fall feeding, so check every 3–4 days. These cover the main bee feeding methods for syrup; for winter, switch to fondant or dry sugar (see the winter FAQ above). The planner above computes refills for each feeder type and spreads them across your region’s feeding window.

The mixing math is exact where it can be: mass is conserved, ratios are by weight, and finished volumes come from published sucrose-solution density tables (1:1 = 1.23 kg/L, 2:1 = 1.33 kg/L at 20 C), cross-checked against independent Python vectors. Feeding amounts per hive and season windows are planning defaults compiled from extension guidance — every beekeeper’s climate and colonies differ, so treat them as starting points and adjust to your hive weights. All calculations run 100% in your browser; no data leaves your device.