Unedau Mesur Cyffredin a Thabl Trosi
| Trosiadau Metrig |
| unedau Saesneg | Unedau metrig | Saesneg — Metric | Metrig - Saesneg |
| HYD |
| modfedd (mewn) | milimetr(mm) | lin=25.4mm | 1cm = 0.394 modfedd |
| troed(ft) | centimedr (cm) | 1 troedfedd=30.5cm | 1m=3.28 troedfedd |
| iard (yd) | metr(m) | 1llath=0.914m | 1m=1.09llath |
| ffwr | cilomedr | 1 ffwr=201m | 1km = 4.97 ffwr |
| milltir | milltir forol rhyngwladol | 1 milltir=1.6km | 1km = 4.97 ffwr |
| (ar gyfer llywio) | (n milltir) | 1 milltir = 1852m | 1km=0.621 milltir |
|
| PWYSAU |
| owns | gram(g) | 10Z=28.3g | 1g=0.035270Z |
| pwys | cilogram(Kg) | 1ib=454g | 1kg=2.20ib |
| carreg | | 1 stôn=6.35kg | 1kg=0.157 stôn |
| tunnell | tunnell(t) | 1 tunnell=1.02t | 1t=0.984 tunnell |
|
| ARDAL |
| modfedd sgwâr (mewn 2) | centimetr sgwâr (cm2) | 11i2=6.45cm2 | 1cm2=0.155in2 |
| troedfedd sgwâr (ft2) | metr sgwâr (m2) | 1 troedfedd²=929cm2 | 1m2=10.8f2 |
| llath sgwâr (yd2) | metr(m) | 1llth²=0.836cm2 | 1m²=1.20llath2 |
| milltir sgwâr | cilometr sgwâr(Km2) | 1 milltir sgwâr = 2.59km2 | 1km²=0.386 milltir sgwâr |
|
| CYFROL |
| ciwbiginch (mewn 3) | centimetr ciwbig (cm3) | 1 mewn³=16.4cm3 | 1cm³=0.610in3 |
| troed ciwbig (ft³) | metr ciwbig(m³) | 1 troedfedd³=0.0283m³ | 1m3=35.3f3 |
| iard giwbig (yd3) | | 1yd³=0.765m3 | 1m³=1.31llath3 |
|
| CYFROL(FLUIDS) |
| owns hylif (floz) | mililitr(ml) | 1ffloz=28.4I | 1ml=0.0352floZ |
| peint(pt) | litr(L) | 1 pwynt=568ml | 1 litr=1.76pt |