Never mix imperial, metric or cup measures in one recipe, If you use the same measuring system throughout, your dishes should work out correctly. If in doubt, weighing is still the most reliable and much preferred method to use, even by many American cooks. Purchasing a good set of balance scales with either metric or imperial weights, really will eliminate any guesswork and give good, consistent results every time.
Helpful measurement conversions.Spoons
British/ Metric to American
1 teaspoon = 1 teaspoon
1 tablespoon = 1 tablespoon
2 tablespoons = 3 tablespoons
3.5 tablespoons = 4 tablespoons
4 tablespoons = 5 tablespoons
Solid measuresUsing the one-cup standard measure as sold here in the UK (NB: Please remember to alter the amount for your own recipe)
British = American
1lb (450g) butter or margarine = 2 cups (or four sticks).
1lb (450g) flour = 4 cups.
1lb 450 g, granulated or caster, (superfine), sugar = 2 cups.
1lb 450 g, icing sugar (confectioners' sugar) = 3 cups.
4 oz, 110 g, icing sugar, (confectioner's sugar), = half a cup plus a heaped tbsp.
8 oz, 225 g, flour = 2 cups.
4 oz, 110 g, flour, = 1 cup.
8 oz, 225 g, breadcrumbs = 2 cups.
4 oz, 110 g, breadcrumbs. = 1 cup.
8 oz, 225 g, oatmeal = 2 cups.
4 oz, 110 g, oatmeal = 1 cup.
8 oz, 225 g, grated cheese = 2 cups.
4 oz, 110 g, grated cheese = 1 cup.
8 oz, 225 g, butter, margarine, or shortening = one cup (or two sticks).
4 oz, 110 g, butter, margarine, or shortening = half a cup (or one stick).
2 oz, 50 g, butter, margarine or shortening = a quarter of a cup (or half a stick).
4 oz, 110 g, dried mixed fruit, (fruitcake mix) = 2-thirds of a cup.
2 oz, 50 g, dried mixed fruit, (fruit cake mix) = one-third of a cup.
8 oz, 225 g, brown sugar = 1 cup.
4 oz, 110 g, brown sugar = half a cup
3 oz, 75 g, plain, (semi-sweet) chocolate, broken into squares = 3-quarters of a cup.
4 oz, 110 g, whole hazelnuts = 1 cup.
2 oz, 50 g, flaked, (slivered) almonds = half a cup.
4 oz, 110 g, ground almonds = 1 cup.
Useful teaspoon measures.
1 oz, 25 g, is one heaped or heaping, tbsp of flour, oatmeal, cheese, breadcrumbs, or icing, confectioners grade, sugar.
1 oz, 25 g, is 1 rounded tbsp, of granulated or caster, superfine, sugar.
1 oz, 25 g, is 2 level tbsp of butter, margarine or shortening.
Converting Metric/British to US Measures:half a tsp, 2.5 ml. = half a tsp, 2.5 ml.
1 tsp, 5 ml. = 1 tsp, 5 ml.
1 average tbsp, 15 ml. = 1 average tbsp, 15 ml.
A quarter of a pint, 150 ml. = Two thirds of a cup.
120 ml, 4 fl.oz, = half a cup.
Half a pint, 275 ml, 8 fl.oz, = A generous 1 cup.
Three-quarters of a pint, 425 ml. = Two cups
1 pint, 570 ml. = Two and a half cups.
One and a half pints, approx. 840 ml. = Three and three-quarter cups.
1 and 3-quarter pints, 1 litre, = 4 and a half cups.
2 pints = 5 cups.
Source of information: here