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30g Water = ⅛ cup

30 grams of water equals ⅛ cup (0.13 US Customary cups, 0.12 Metric 250 mL cups, 29.9 mL, 2.03 tablespoons, or 1.06 oz) when measured poured liquid at a verified density of 237g per US Customary cup.

Exact decimal volume: 0.13 US Customary Cups • 0.12 Metric Cups (250 mL) • 2.03 tbsp • 1.06 oz

Batch
Measuring density
Standard: Poured liquid237g / cup
Converted Measure
30 g Water (Poured liquid) =
⅛ US Cup
Physical scoop breakdown0.13 cups
×2
2 tbsp
Edit either side to reverseWater chart →
Grams
30 g
Ounces
1.06 oz
US Cups
⅛ cup
Metric (250mL)
0.12 c
Tablespoons
2.03 tbsp
Milliliters
29.9 mL

Kitchen note: 1 US Customary Cup (236.6 mL) of water (poured liquid) weighs 237g, while 1 International Metric Cup (250 mL) weighs 250g.

Batch Scaling Around 30g Water

Batch scaling conversion table around 30g of Water (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×) 15g (0.53 oz) 1 tbsp 15 mL
Standard (1×) 30g (1.06 oz) ⅛ cup 29.9 mL
1.5× Batch 45g (1.59 oz) 3 tbsp 44.9 mL
Double Batch (2×) 60g (2.12 oz) ¼ cup 59.9 mL
Triple Batch (3×) 90g (3.17 oz) ⅓ cup + 2 ¼ tsp 89.8 mL

Measuring 30g of Water in the Kitchen

Because 1 US Customary Cup (236.6 mL) of water weighs 237g when measured poured liquid, 30 Grams (30g) translates to 0.13 US cups (⅛ cup).

Without a kitchen scale, measure ⅛ cup (2.03 tablespoons total) using poured liquid technique. Place a liquid measuring cup on a flat countertop and read the water meniscus at eye level. Standard water has a pure density of 1.00 g/mL, making 1 US cup exactly 237 grams (or 236.6g).

Source note: NIST Standard Reference Data; 1 US customary cup = 236.588 mL = 236.6 g pure water at 20°C

Frequently Asked Questions

How many cups is 30 grams of water? ▾

30 grams of water (Poured liquid, 237g per US cup) equals ⅛ cup (0.13 US Customary Cups, 0.12 Metric 250 mL cups, or 2.03 tablespoons).

Why is 1 cup of water exactly 237 grams? ▾

One US customary cup equals 236.588 milliliters; since water has a metric density of 1 gram per milliliter at room temperature, it weighs 237 grams.

Does water temperature affect cup weight? ▾

Warm or cold water varies in density by less than 0.5% across normal cooking ranges, maintaining 237 grams for all culinary purposes.