How do I convert a 6 inch cake pan to a 9 inch pan?

A 6-inch round pan has a volume of about 141 cubic inches while a 9-inch round pan has about 318 cubic inches — so you need approximately 2.25 times more batter for a 9-inch pan at the same height. Multiply all your ingredients by 2.25 to fill a 9-inch pan to the same depth. The pan converter above calculates this automatically for any pan size and shape combination.

How many servings does a 9 inch round cake serve?

A 9-inch round cake serves approximately 12 party-sized slices or up to 20 wedding-sized slices. The serving count depends on how you cut it: party portions (about 1.5 inches wide at the edge) yield 12-14 slices, while wedding portions (about 1 inch wide) yield 18-24 slices. Use the serving size calculator above for any pan size and shape.

How much instant yeast equals active dry yeast?

Instant yeast is about 25% stronger than active dry yeast. To convert: multiply the active dry yeast amount by 0.75 to get the instant yeast equivalent. For example, 1 teaspoon of active dry yeast equals 3/4 teaspoon of instant yeast. To go the other direction, multiply instant yeast by 1.33 to get the active dry equivalent. Fresh yeast is about 3 times weaker than instant — divide the fresh yeast amount by 3 to get the instant equivalent.

How do I adjust baking recipes for high altitude?

At high altitudes, lower air pressure causes baked goods to rise too quickly and then collapse. General adjustments for 5,000 feet: reduce baking powder by 1/8 to 1/4 teaspoon per teaspoon, reduce sugar by 1 tablespoon per cup, increase liquid by 2 to 4 tablespoons per cup, and increase oven temperature by 15-25°F. The high altitude calculator above provides specific adjustments for your elevation.

Does baking time change when I use a different pan size?

Yes — when you change pan size, the batter depth changes, which directly affects baking time. A shallower layer bakes faster; a deeper layer takes longer. As a rule of thumb, if your new pan results in a shallower batter depth, reduce baking time by 10-20% and check for doneness early. If the batter is deeper, increase time by 15-25% and reduce temperature by 25°F to ensure the center cooks through without the edges over-browning. The time adjuster tab calculates this automatically.

Can I substitute a square pan for a round pan?

Yes, with adjustment. An 8-inch square pan has about 25% more volume than an 8-inch round pan (64 vs 50 square inches of base area). Use the pan converter to get the exact scaling factor for any round-to-square or square-to-round substitution. The batter depth will be slightly different, so check for doneness a few minutes earlier than the original recipe suggests.

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The Baker's Calculator

Convert pan sizes, scale recipes intelligently, adjust bake times, calculate altitude corrections, convert yeast, and find serving sizes — everything a serious baker needs, free.

🍰 Pan converter — all shapes 📋 Smart recipe scaler ⏱️ Time & temp adjuster 🏔️ Altitude calculator 🍞 Yeast converter 🎂 Serving size calculator

Built and maintained by the Rytell baking team — home bakers who test these conversions in our own kitchens. Figures are grounded in established baking science and standard pan-volume data. About us & our method →

🍰 Pan size converter

Enter your original pan and the pan you want to use. The calculator finds the exact volume ratio so you know how to scale every ingredient — and whether you need to split the batter across multiple pans.

Original pan shape

Target pan shape

Number of original pans

Number of target pans

Unit

🎨 Pan size comparison

Volume comparison — to scale

📏 Standard pan volume reference

Pan size & shape	Base area	Volume (2" deep)	Cups of batter	Fl oz	Typical use
6" round	28 sq in	56 cu in	~3.9 cups	~31 fl oz	Small layer cakes, smash cakes
8" round	50 sq in	100 cu in	~6.9 cups	~55 fl oz	Standard layer cake
9" round	64 sq in	128 cu in	~8.9 cups	~71 fl oz	Most common cake size
10" round	79 sq in	158 cu in	~10.9 cups	~88 fl oz	Large party cakes
12" round	113 sq in	226 cu in	~15.6 cups	~125 fl oz	Wedding cake tiers
8" square	64 sq in	128 cu in	~8.9 cups	~71 fl oz	Brownies, bars, small cakes
9" square	81 sq in	162 cu in	~11.2 cups	~90 fl oz	Brownies, bars
9×13" rect	117 sq in	234 cu in	~16.2 cups	~130 fl oz	Sheet cakes, most casseroles
10×15" jelly roll	150 sq in	225 cu in	~15.6 cups	~125 fl oz	Roll cakes, thin sheet cakes
8½×4½" loaf	38 sq in	114 cu in	~7.9 cups	~63 fl oz	Loaf breads, pound cakes
9×5" loaf	45 sq in	135 cu in	~9.4 cups	~75 fl oz	Standard bread loaf
10" bundt	~80 sq in	~240 cu in	~16.6 cups	~133 fl oz	Bundt cakes
10" tube	~74 sq in	~222 cu in	~15.4 cups	~123 fl oz	Angel food, chiffon cakes
9" springform	64 sq in	128 cu in	~8.9 cups	~71 fl oz	Cheesecakes, tortes
10" springform	79 sq in	158 cu in	~10.9 cups	~88 fl oz	Large cheesecakes

🔄 Common pan substitutions

The most common pan swaps — with the volume difference noted so you know whether to expect a taller or shallower result.

Recipe calls for	Substitute with	Volume difference	Note
9×13" rectangle	Two 9" round pans	+10% more	Layers will be slightly thinner
9×13" rectangle	Two 8" round pans	−9% less	Slightly thicker layers — check early
Two 9" rounds	One 9×13" rectangle	Equivalent	Reduce bake time by ~10 min
9" round	8" round	−21% less	Fill only ⅔ full — batter may overflow
8" round	9" round	+27% more	Cake will be shallower — check 5 min early
6" round	8" round	+79% more	Nearly double the recipe for an 8" pan
9" round	8" square	Equivalent	Square and 9" round have ~same area
10" bundt	9×13" rectangle	+2% (near-equal)	Best 1-for-1 bundt substitute
10" bundt	Two 9" rounds	Equivalent	Split batter evenly
9×5" loaf	8½×4½" loaf	−17% less	Fill target pan ⅔ full max
9" springform	9" round (2" deep)	Equivalent	Use parchment collar if batter is deep
8" square	9" round	Equivalent	Classic brownie-to-round swap

Golden rule: When substituting a larger pan, your batter will be shallower — reduce bake time by 10–15% and check early. When substituting a smaller pan, your batter will be deeper — reduce temperature by 25°F and increase time by 15–25%. Always use the Pan Converter above for exact calculations on non-standard sizes.

Elevation	Leavening	Sugar	Liquid	Temp
Sea level–3,000 ft	No change	No change	No change	No change
3,000–5,000 ft	−⅛ tsp per tsp	−1 tbsp per cup	+1–2 tbsp per cup	+15°F
5,000–7,000 ft	−¼ tsp per tsp	−2 tbsp per cup	+2–4 tbsp per cup	+20°F
7,000–10,000 ft	−⅜ tsp per tsp	−3 tbsp per cup	+3–5 tbsp per cup	+25°F
Above 10,000 ft	−½ tsp per tsp	−4 tbsp per cup	+4–6 tbsp per cup	+25–30°F

Active dry yeast	Instant yeast	Fresh yeast	Notes
1 tsp	¾ tsp	⅜ oz (~11g)	Standard small recipe
1½ tsp	1⅛ tsp	½ oz (~14g)
2¼ tsp (1 packet)	1¾ tsp	¾ oz (~21g)	Standard loaf of bread
1 tbsp	2¼ tsp	⅞ oz (~25g)
2 tbsp	4½ tsp	1¾ oz (~50g)	Large batch / multiple loaves

Round cake size	Party slices	Wedding slices	Notes
6 inch (2 layers)	8–10	12–16	Perfect for small gatherings
8 inch (2 layers)	12–16	20–24	Standard birthday cake size
9 inch (2 layers)	16–20	24–30	Most common size
10 inch (2 layers)	20–25	30–38	Large party
12 inch (2 layers)	30–38	48–56	Wedding tier
9×13 sheet (1 layer)	20–24	35–40	Most versatile size
Half sheet (13×18)	48–54	70–80	Large events

🧁 Cupcake & muffin yield calculator

Find out how many cupcakes or muffins your cake recipe will make — or convert a cake recipe to cupcakes. Standard cupcake tins use about ¼ cup of batter per cup filled ⅔ full.

What I have

Original pan / quantity

Cupcake size

Fill level

Cupcake / muffin type	Batter per cup	Fill level	Bake time
Mini cupcakes	1 tablespoon	⅔ full	10–14 min at 350°F
Standard cupcakes	¼ cup (4 tbsp)	⅔ full	18–24 min at 350°F
Jumbo cupcakes	⅓ cup	⅔ full	22–28 min at 350°F
Standard muffins	⅓ cup	¾ full	18–25 min at 375°F
Jumbo muffins	½ cup	¾ full	25–30 min at 375°F
Mini muffins	1 tablespoon	¾ full	10–15 min at 375°F

🌡️ Oven temperature converter

Convert between Fahrenheit, Celsius, and gas marks instantly. Enter any temperature and all three equivalents update automatically.

Fahrenheit (°F)

Celsius (°C)

Gas mark

Convection oven adjustment: If your recipe was written for a conventional oven and you're using convection (fan), reduce the temperature by 25°F (15°C) and check for doneness 5–10 minutes early. Convection circulates hot air more efficiently, cooking faster and more evenly.

📋 Common baking temperatures reference

Description	°F	°C	Gas Mark	Typical use
Very low	250°F	120°C	½	Meringues, slow-drying
Low	300°F	150°C	2	Slow-baked cheesecakes, custards
Moderately low	325°F	165°C	3	Pound cakes, dense loaves
Moderate	350°F	175°C	4	Most cakes, cookies, muffins
Moderately high	375°F	190°C	5	Muffins, quick breads, some cookies
Hot	400°F	200°C	6	Puff pastry, croissants, pies
Very hot	425°F	220°C	7	Pizza, rustic breads, choux pastry
Extremely hot	450°F	230°C	8	Artisan bread, high-temp pizza
Broil / max	500°F+	260°C+	9–10	Finishing, caramelizing tops

⚖️ Ingredient weight reference — cups to grams

Measuring by weight is more accurate than volume. One cup of flour can vary by 20–30g depending on how you scoop. Use these weights for consistent results.

Why weight beats volume: A "cup" of flour can weigh anywhere from 120g (properly spooned and leveled) to 165g (scooped and packed) depending on technique. Professional bakers and all King Arthur recipes list weights because they produce the same result every time regardless of how you measure. A $15–25 digital scale is the single highest-impact tool upgrade for home bakers.

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Baking calculator FAQ

🔬 Why baking math matters

📐 Pan volume is everything

Baking is chemistry — the ratio of ingredients to volume directly affects texture, rise, and doneness. A 9-inch pan holds 78% more batter than a 6-inch pan. Pouring the same batter without adjusting creates either a thin, overcooked cake or an underfilled pan.

⚖️ Weight beats volume

One cup of flour can vary by up to 30% depending on how you scoop it. Professional bakers always measure by weight in grams. A $15 digital scale is the single best investment for consistent baking results.

🌡️ Temperature matters more than time

Every oven runs differently — calibration can be off by 25–50°F without any visible indication. An oven thermometer ($10) reveals your real baking temperature. Start checking for doneness 5–10 minutes before the recipe states.

🧪 Leavening doesn't scale linearly

Baking powder and baking soda have maximum effectiveness thresholds. Doubling a recipe should never mean exactly doubling the leavening — especially beyond 2× scale. Start with 75% of the calculated leavening amount and adjust.

🔗 Trusted baking resources

👑 King Arthur Baking The gold standard for baking recipes, weights, and technique 🔬 Serious Eats Science-first baking guides and tested recipes 💬 r/AskBaking Active community for baking questions and troubleshooting 🍞 The Fresh Loaf Bread baking community with forums and tutorials 🎂 Wilton Cake decorating supplies and pan serving guides 🛒 Cake Pans on Amazon Round, square, springform, bundt, and loaf pan sets

🍰 Baking equipment on Amazon

Tools that make a real difference in your baking results.

⚖️ Digital kitchen scales Precision gram scales — the single highest-impact baking upgrade 🌡️ Oven thermometers Most ovens run 25–50°F off — verify yours with a thermometer 🍬 Instant-read thermometers For bread, custard, and candy doneness — and safe yeast water temps 🧁 Baking pan sets Round, square, loaf, and bundt pans — complete sets 🥣 Mixing bowl sets Nesting stainless bowls — tare one on your scale and go 🥄 Measuring cups & spoons Accurate stainless sets for teaspoon-scale salt and leavening 🍪 Cooling racks Let cakes and loaves cool evenly without soggy bottoms 🟫 Silicone baking mats Reusable non-stick liners for cookies, buns, and pastry 🍰 Stand mixers KitchenAid and Cuisinart stand mixers — all sizes and colors 👑 King Arthur Baking Premium flours, specialty ingredients, and baking tools

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In-depth baking guides

🍰 How to convert cake pan sizes Swap pans without a sunken or overflowing cake — the volume math made simple. ⚖️ Why baking by weight beats cups A cup of flour can vary 30% — here's why grams make you a better baker. 🏔️ High-altitude baking adjustments The leavening, liquid, sugar, and temperature tweaks that actually work. 🍞 Active dry vs instant vs fresh yeast How to substitute between yeast types without wrecking the rise.