Gas mark

170 °C in Gas Mark

170 °C on a gas oven dial:

gas mark 3–4

Between two dial settings

150 °C

Fan-forced oven

There is no exact gas mark for 170 °C. The dial steps from 160 °C (gas mark 3) to 180 °C (gas mark 4), so this temperature falls between the two. Gas mark 3 gives a gentler bake, gas mark 4 a faster one — the 10 °C either way is smaller than the swing of most domestic thermostats.

Fan-forced ovens run about 20 °C hotter than conventional at the same dial setting, so 170 °C is 150 °C with the fan on. See the full oven temperature conversion chart.

This one has no clean answer, and any chart that gives you a single number is rounding without telling you. The gas ladder steps 160 °C (gas mark 3) then 180 °C (gas mark 4), so 170 °C lands exactly halfway between two rungs with nothing marked on the dial for it.

Quick reference

170 °C in Gas Mark conversion table

Gas mark	Between 3 and 4
Conventional oven (°C)	170 °C
Fahrenheit (°F)	338 °F
Fan-forced / convection	150 °C
Oven description	Moderate

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Questions

Frequently asked questions

What is 170 °C in gas mark?

There is no exact gas mark for 170 °C — it sits midway between gas mark 3 (160 °C) and gas mark 4 (180 °C). Most recipes converted from 170 °C use gas mark 3 for a slightly gentler bake; choose gas mark 4 if you want it to move a little faster and are happy to check early.

Is 170 °C gas mark 3 or gas mark 4?

Either can be defended, which is why charts disagree. Gas mark 3 is the safer choice for cakes, custards and anything that suffers from a hot oven; gas mark 4 suits roasting and pastry, where a touch more heat helps. The 10 °C either way is smaller than the swing of most domestic thermostats.

What is 170 °C in Fahrenheit?

170 °C is 338 °F exactly. US ovens are marked in 25 °F steps, so there is no 338 setting either — use 325 °F to match gas mark 3, or 350 °F to match gas mark 4.

What is 170 °C in a fan oven?

Set a fan oven to 150 °C. The fan adjustment is always about 20 °C below the conventional temperature, and it applies to 170 °C just as it does to the marked rungs.

More conversions

Gas mark to Celsius conversion chart

Every gas mark with its conventional oven temperature in °C and °F, plus the fan-oven setting. Fan-forced ovens run about 20 °C hotter at the same dial position, so the fan column is 20 °C below the conventional one throughout.

Gas mark	°C	°F	Fan °C	Oven
Gas mark ¼	110 °C	225 °F	90 °C	Very cool / slow
Gas mark ½	120 °C	250 °F	100 °C	Very cool
Gas mark 1	140 °C	275 °F	120 °C	Cool
Gas mark 2	150 °C	300 °F	130 °C	Cool
Gas mark 3	160 °C	325 °F	140 °C	Moderate
Gas mark 4	180 °C	350 °F	160 °C	Moderate
Gas mark 5	190 °C	375 °F	170 °C	Moderately hot
Gas mark 6	200 °C	400 °F	180 °C	Hot
Gas mark 7	220 °C	425 °F	200 °C	Hot
Gas mark 8	230 °C	450 °F	210 °C	Very hot
Gas mark 9	240 °C	475 °F	220 °C	Very hot

Convert a temperature to gas mark

Working the other way — start from the °C in your recipe and find the dial setting.

180 °C in Gas Markgas mark 4 · 350 °F · 160 °C fan 200 °C in Gas Markgas mark 6 · 400 °F · 180 °C fan 190 °C in Gas Markgas mark 5 · 375 °F · 170 °C fan 220 °C in Gas Markgas mark 7 · 425 °F · 200 °C fan 160 °C in Gas Markgas mark 3 · 325 °F · 140 °C fan170 °C in Gas Markgas mark 3–4 · 150 °C fan210 °C in Gas Markgas mark 6–7 · 190 °C fan

← Full oven temperature conversion chart