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120g Caster / Superfine Sugar = ½ cup + 1 ½ tsp

120 grams of caster / superfine sugar equals ½ cup + 1 ½ tsp (0.53 US Customary cups, 0.5 Metric 250 mL cups, 126.2 mL, 8.53 tablespoons, or 4.23 oz) when measured poured & leveled at a verified density of 225g per US Customary cup.

Exact decimal volume: 0.53 US Customary Cups • 0.5 Metric Cups (250 mL) • 8.53 tbsp • 4.23 oz

Batch
Measuring density
Converted Measure
120 g Caster / Superfine Sugar (poured & leveled) =
½ US Cup + 1 ½ tsp
Physical scoop breakdown0.53 cups
1/2 cup
1 ½ tsp
Edit either side to reverseCaster Sugar chart →
Grams
120 g
Ounces
4.23 oz
US Cups
½ cup + 1 ½ tsp
Metric (250mL)
0.5 c
Tablespoons
8.53 tbsp
Milliliters
126.2 mL

Kitchen note: Test-kitchen baseline uses poured & leveled (225g/cup). Switching to spooned into cup (215g/cup) changes each cup by 10g—use the packing toggle on the scale bench to match your recipe.

Batch Scaling Around 120g Caster / Superfine Sugar

Batch scaling conversion table around 120g of Caster / Superfine Sugar (0.5× to 3× recipe batches in grams, ounces, US cups, and milliliters)
Batch Scale Weight (g / oz) US Cups & Spoons Metric (mL)
Half Batch (0.5×) 60g (2.12 oz) ¼ cup + ¾ tsp 63.1 mL
Standard (1×) 120g (4.23 oz) ½ cup + 1 ½ tsp 126.2 mL
1.5× Batch 180g (6.35 oz) ¾ cup + 2 ½ tsp 189.3 mL
Double Batch (2×) 240g (8.47 oz) 1 cup + 1 tbsp + ¼ tsp 252.4 mL
Triple Batch (3×) 360g (12.7 oz) 1 ½ cups + 1 tbsp + 1 ¾ tsp 378.5 mL

Measuring 120g of Caster / Superfine Sugar in the Kitchen

Because 1 US Customary Cup (236.6 mL) of caster / superfine sugar weighs 225g when measured poured & leveled, 120 Grams (120g) translates to 0.53 US cups (½ cup + 1 ½ tsp). By contrast, using the spooned into cup measure (215g/cup — a 10g per-cup shift), 120g occupies ½ cup + 2 ¾ tsp (0.56 cups).

Without a kitchen scale, measure ½ cup + 1 ½ tsp (8.53 tablespoons total) using poured & leveled technique. Pour and level flat. Because the micro-granules pack closer together than regular granulated sugar, 1 cup weighs a dense 225 grams.

Source note: British Baker standard (225g/cup) & Domino Superfine specifications

Frequently Asked Questions

How many cups is 120 grams of caster / superfine sugar? ▾

120 grams of caster / superfine sugar (poured & leveled, 225g per US cup) equals ½ cup + 1 ½ tsp (0.53 US Customary Cups, 0.5 Metric 250 mL cups, or 8.53 tablespoons).

Why do British and Australian recipes call for caster sugar? ▾

Caster sugar dissolves almost immediately into egg whites and butter, preventing gritty meringues and dry cake crumbs.

Why does a cup of caster sugar weigh 225g while granulated weighs 200g? ▾

Smaller crystal size means tighter packing with significantly less empty airspace between granules.