170 C to F: Exact Conversion and Oven Settings

Anyone who’s ever faced a recipe calling for 170°C when their oven dial only reads Fahrenheit knows the sinking feeling. The exact conversion is 338°F, but many oven dials round to 350°F because temperatures are typically marked in 25°F increments.

170°C in Fahrenheit (exact): 338°F ·
Common oven rounding: 350°F ·
Fan oven (convection): 150°C / 300°F ·
Gas mark equivalent: 3-4 ·
Air fryer setting: 338°F

The table below gives a condensed reference for the most common settings related to 170°C.

What is 170 C to F?

How to convert 170°C to Fahrenheit

Converting a Celsius oven temperature to Fahrenheit is straightforward with the standard formula: °F = (°C × 9/5) + 32. For 170°C, that works out as (170 × 1.8) + 32 = 338°F. This formula, published by Beko UK (appliance manufacturer), is the same one used across all conventional ovens.

Why the exact result is 338°F

According to WuKong Education (tutorial platform), 170°C converts precisely to 338°F. The number is not a neat round figure because the Fahrenheit scale is calibrated differently — each degree Celsius equals 1.8 degrees Fahrenheit. This means many Celsius values produce fractional results when converted.

The implication: when a recipe calls for 170°C and you set your dial to 338°F, you’re matching the heat exactly. But that’s rarely what oven dials show.

Is 170 C equal to 350 F?

Six major oven manufacturers, one pattern: they round up. The Harvest Kitchen (food blog) explains that oven temperatures are typically marked in 25°F increments, so 338°F lands between 325°F and 350°F. Most dials push it to the nearest mark: 350°F.

Why many ovens mark 350°F instead of 338°F

Manufacturers design dials with preset intervals for ease of use. According to Which? (consumer advocacy group), a 350°F setting is common for ‘moderately hot’ cooking, and 338°F is not a standard marking. The 12‑degree difference is small enough that most baked goods won’t notice.

When to use 350°F vs. 338°F in recipes

For cookies, cakes, and casseroles the 350°F approximation works fine. For delicate items like custards or meringues, a few degrees matter. Beko UK advises using a separate oven thermometer to check actual internal temperature. The trade-off: convenience versus precision.

The catch: rounding to 350°F adds heat that can over-brown some recipes. If your cake comes out darker than expected, try 325°F and check earlier.

What is 170C in a fan oven?

Fan (convection) ovens circulate hot air, so they cook faster at a lower temperature. The standard adjustment is a reduction of 20°C.

Fan oven temperature conversion rule

According to Flawless Food (UK food resource), 170°C conventional converts to 150°C fan and approximately 300°F. That same table shows 180°C conventional → 160°C fan, 190°C conventional → 170°C fan, and 200°C conventional → 180°C fan.

Recommended fan oven setting for 170°C conventional

Set your fan oven to 150°C (or 300°F when using a Fahrenheit fan oven). Which?’s conversion table lists 170°C fan as corresponding to gas mark 5, but that’s for a fan oven running at 170°C — not the conventional setting. Double-check your manual.

Why this matters: ignoring the fan reduction can over‑cook your food. A 170°C conventional recipe baked in a fan oven without adjustment may dry out or burn.

Is 170 warm in the oven?

Oven temperatures are often described in descriptive ranges. 170°C (338°F) falls into the ‘moderate’ zone.

Oven temperature ranges (cool, warm, moderate, hot)

• Cool / very slow: 120–140°C (250–275°F)
• Warm / slow: 140–160°C (275–325°F)
• Moderate: 160–180°C (325–350°F) — 170°C lives here
• Moderately hot: 180–200°C (350–400°F)
• Hot: 200–220°C (400–425°F)
• Very hot: 220–250°C (425–500°F)

These ranges are standard across UK and US cooking, based on Which?’s oven temperature guide.

What 170°C is used for in baking

170°C is the go‑to temperature for many cakes, cookies, and slow‑roasted vegetables. It’s also common for reheating pastry‑wrapped dishes. WuKong Education describes it as a ‘moderately slow oven’ — ideal for even cooking without aggressive browning.

The pattern: 170°C sits at the sweet spot between gentle warming and full roasting, making it one of the most frequently used oven settings.

What is 180 C to F?

180°C is only 10 degrees above 170°C, but the Fahrenheit difference is larger — 356°F vs. 338°F. Here’s a direct comparison of the two temperatures across units.

The table below shows how 170°C and 180°C stack up against each other across different measurement systems.

180°C conversion to Fahrenheit

Using the same formula, 180°C = 356°F. Flawless Food maps 180°C conventional to 160°C fan and 350°F (rounded). Note that 356°F is closer to 360°F than 350°F, so rounding to 350°F introduces a 6°F error.

Difference between 170°C and 180°C in baking

A 10°C jump translates to 18°F. For baking, that’s enough to turn a tender cake into a crusty one. Which? notes that gas mark 5 (190°C conventional, 170°C fan) is considered ‘moderately hot’, while gas mark 4 (177°C, rounded to 350°F) is ‘moderate’. Understanding where your recipe sits on this scale prevents over‑ or under‑cooking.

The takeaway: if your recipe says 180°C and you substitute 170°C, expect longer cooking and less browning. If the recipe says 170°C and you use 180°C, check several minutes early.

How to convert 170°C to Fahrenheit in 3 steps

1. Multiply by 9/5 (or 1.8). 170 × 1.8 = 306.
2. Add 32. 306 + 32 = 338. This is the exact Fahrenheit value.
3. Adjust for your oven type. If using a fan oven, subtract 20°C from the Celsius value first (170 → 150°C) then convert: 150 × 1.8 + 32 = 302°F (≈300°F).

For air fryers, use 338°F directly — no rounding needed. Which? confirms that air fryers typically match set temperature closely.

What we know and what’s unclear

What experts say

We advise using a separate stainless steel oven thermometer to verify the actual temperature, because oven dials can be inaccurate, especially over time.

Which? (consumer product testing organisation)

Some products have different Gas Mark temperature ratings. Please refer to the product manual for the specific rating.

Beko UK (home appliance manufacturer)

For home bakers, the choice between 338°F and 350°F matters less for most everyday recipes, but for precision baking like meringues or custards, relying on a separate oven thermometer is the only way to guarantee accuracy. So set your dial to 350°F and check early, or invest in a thermometer and cook at the exact 338°F — the difference is a small price for consistent results.