Cooking Measurement Conversions: Cups, Grams, Oven Temperatures, and Cook Times
Recipes from different countries use different measurement systems, and even within the same country a recipe might call for weight in one step and volume in the next. Understanding how to convert between these systems — and knowing what those conversions actually mean in the kitchen — is one of the most practical skills a home cook can develop. This guide covers everything from cups and tablespoons to oven temperatures and meat safety.
Volume Measurements: From Teaspoons to Gallons
The US customary volume hierarchy runs:
| Unit | Fluid ounces | Millilitres (approx.) |
|---|---|---|
| 1 teaspoon (tsp) | 1/6 fl oz | 4.93 mL |
| 1 tablespoon (tbsp) | 1/2 fl oz | 14.79 mL |
| 1 fluid ounce | 1 fl oz | 29.57 mL |
| 1 cup | 8 fl oz | 236.59 mL |
| 1 pint | 16 fl oz | 473 mL |
| 1 quart | 32 fl oz | 946 mL |
Use the Cooking Volume Converter for quick conversions across all these units, the Tablespoons to Cups converter when scaling spice quantities, the Teaspoons to Tablespoons converter for smaller amounts, and the Fluid Ounces to Millilitres converter when working with metric recipes.
Weight Measurements: Grams vs Cups
One of the most common points of confusion in baking is that a cup of flour and a cup of sugar weigh entirely different amounts. Volume measures are inherently imprecise for dry ingredients because density varies.
| Ingredient | 1 cup (approx. grams) |
|---|---|
| All-purpose flour (sifted) | 120 g |
| All-purpose flour (scooped) | 150 g |
| Granulated sugar | 200 g |
| Brown sugar (packed) | 220 g |
| Butter | 227 g |
| Rolled oats | 90 g |
The Cups to Grams converter and the Grams to Cups converter both carry ingredient-specific density data so results are accurate. For butter specifically, American recipes often specify sticks — the Butter Sticks to Grams converter shows that 1 US butter stick = 113 g = 1/2 cup.
The Cooking Weight Converter handles broader conversions between grams, ounces, pounds, and kilograms.
Scaling Recipes
When cooking for a different number of servings, every ingredient scales proportionally by the ratio of desired servings to original servings:
new quantity = original quantity × (desired servings / original servings)
Be aware that cooking times and temperatures do not always scale linearly. A double-batch cake baked in the same pan needs more time; a half-batch in the same pan may need less. The Recipe Serving Scaler handles the ingredient maths and flags items like leavening agents that should not be scaled in direct proportion. It also addresses pan-size adjustments — see the Baking Pan Size Converter for swapping round pans for square pans or adjusting between volume capacities.
Oven Temperature Conversions
British and Australian recipes use Celsius and sometimes Gas Marks; American recipes use Fahrenheit.
| Fahrenheit | Celsius | Gas Mark | Description |
|---|---|---|---|
| 300 °F | 150 °C | 2 | Very slow |
| 325 °F | 160 °C | 3 | Slow |
| 350 °F | 180 °C | 4 | Moderate |
| 375 °F | 190 °C | 5 | Moderately hot |
| 400 °F | 200 °C | 6 | Hot |
| 425 °F | 220 °C | 7 | Very hot |
The conversion formula is °C = (°F − 32) × 5/9. The Oven Temperature Converter also accounts for fan-assisted (convection) ovens, which typically run 20 °C hotter than conventional ovens and may need a shorter cooking time.
Meat Cooking Times and Food Safety
Cooking meat safely requires reaching an internal temperature high enough to destroy harmful bacteria. The USDA minimum safe internal temperatures are:
| Meat | Minimum internal temp | Rest time |
|---|---|---|
| Poultry (all) | 165 °F (74 °C) | None required |
| Ground beef / pork | 160 °F (71 °C) | None required |
| Beef / pork whole cuts | 145 °F (63 °C) | 3 minutes |
| Ham (fresh) | 145 °F (63 °C) | 3 minutes |
The Meat Internal Temperature Guide covers doneness levels for all common meats and cuts, while the Meat Cooking Time Calculator estimates roasting or grilling time based on weight and desired doneness. For holiday planning, the Turkey Thaw Time Calculator shows how long a frozen turkey needs in the refrigerator (approximately 24 hours per 5 pounds) versus a cold-water bath.
Common Mistakes
- Scooping flour directly from the bag. This compresses flour into the cup, adding 20–30 % extra. Spoon flour into the cup and level it off for accuracy, or better yet, weigh it.
- Ignoring density when converting cups to grams. A cup of water is 237 g, but a cup of honey is about 340 g. Always use ingredient-specific conversions.
- Checking meat temperature at the wrong spot. Insert the thermometer into the thickest part, away from bone, to get an accurate reading.
- Scaling leavening agents directly. Baking powder and baking soda do not scale linearly with batch size for large multipliers; use about 3/4 of the scaled amount for double or triple batches.
How do I convert a UK recipe to US measurements?
UK tablespoons are 15 mL, the same as US. UK cups are 250 mL while US cups are 237 mL — close enough that recipes rarely require adjustment. The main difference is oven temperature: UK recipes use Celsius, so convert with the formula above or use the Oven Temperature Converter.
Can I substitute volume for weight in baking?
For liquids, yes — 1 cup of water is reliably 237 mL and 237 g. For dry ingredients, weighing is always more accurate. Professional bakers almost always use a scale.
How long does it take to thaw a turkey in the fridge?
Allow 24 hours of refrigerator thawing time for every 5 pounds (2.3 kg) of turkey weight. A 15-pound bird needs at least three days. The Turkey Thaw Time Calculator accounts for both refrigerator and cold-water thawing methods.