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Silver and other precious metals are traditionally weighed in Troy ounces.
One Troy ounce is equivalent to 31.1g.
The standard or avoirdupois ounce (used for weighing foodstuffs etc.) is equivalent to 28.35g.
Quick Converter: values approximate
| Troy-Metric | Metric-Troy |
| 1oz = 31.1g | 1g = 0.032oz |
| 2oz = 62.2g | 10g = 0.321oz |
| 3oz = 93.3g | 50g = 1.6oz |
| 4oz = 124.4g | 100g = 3.21oz |
| 5oz = 155.5g | 250g = 8oz |
| 6oz = 186.6g | 500g= 16oz |
| 7oz = 217.7g | 750g = 24.07oz |
| 8oz = 248.8g | 1kg = 32.1oz |
| 9oz = 279.9g | |
| 10oz = 311g |
Measurements
1in = 2.54cm 1cm = 3/8in (approx)
1ft = 30.48cm 1m = 3ft 3,3/8in
Quick Converter: values approximate
| Imperial-Metric | Metric-Imperial |
| 1in = 2.5cm | 1cm = 3/8in |
| 2in = 5cm | 2.5cm = 1in |
| 3in = 7.5cm | 30cm = 12in (1ft) |
| 4in = 10cm | 50cm = 20in |
| 5in = 12.5cm | 1m = 3ft 4in |
| 6in = 15cm | 2m = 6ft 8in |
| 7in = 17.5cm | 3m = 10ft |
| 8in = 20cm | |
| 9in = 22.5cm | |
| 10in = 25cm | |
| 11in = 27.5cm | |
| 1ft = 30cm | |
| 2ft = 60cm | |
| 3ft = 90cm | |
| 5ft = 1.5m | |
| 10ft = 3m |
For smaller objects, such as coins and medals, metric measurement in millimetres is the norm. There are 10mm to 1cm, or about 25mm to 1in.
One mile is equivalent to 1.6km, so a 60kmh speed limit is (roughly) 40mph.
An engine turned silver 50ft tape measure by James Chesterman and Co, Sheffield 1919, £170 at Woolley & Wallis, Salisbury, January 2011.