Free printable dip chart
A 1,360 litre oil tank holds about 1,362 litres full and roughly 1,158 litres at the 85% safe fill. A dip reading of 45cm on this upright rectangular tank is about 454 litres, or 33% full, so topping up to safe fill would mean ordering about 704 more litres.
The 1,360 litre tank, often sold as a 300 gallon tank, is a workhorse size for four-bedroom homes. It gives a useful buffer between deliveries and reduces the chance of running dry in a cold snap.
This tank holds about 1,362 litres full, with a 85% safe fill near 1,158 litres. A dip reading of 45cm works out at roughly 454 litres, or 33% full. Topping up to safe fill from there is about 704 litres. Enter your own price per litre in the calculator above to turn that into a cost.
Every 5cm of oil depth for the 1,360 litre oil tank. Print this and keep it by the tank.
| Depth (cm) | Litres | % full |
|---|---|---|
| 5 | 50 | 4% |
| 10 | 101 | 7% |
| 15 | 151 | 11% |
| 20 | 202 | 15% |
| 25 | 252 | 19% |
| 30 | 303 | 22% |
| 35 | 353 | 26% |
| 40 | 403 | 30% |
| 45 | 454 | 33% |
| 50 | 504 | 37% |
| 55 | 555 | 41% |
| 60 | 605 | 44% |
| 65 | 656 | 48% |
| 70 | 706 | 52% |
| 75 | 756 | 56% |
| 80 | 807 | 59% |
| 85 | 857 | 63% |
| 90 | 908 | 67% |
| 95 | 958 | 70% |
| 100 | 1,009 | 74% |
| 105 | 1,059 | 78% |
| 110 | 1,109 | 81% |
| 115 | 1,160 | 85% |
| 120 | 1,210 | 89% |
| 125 | 1,261 | 93% |
| 130 | 1,311 | 96% |
| 135 | 1,362 | 100% |
Upright / rectangular tank (linear with depth): litres = capacity x (depth / full_height) This tank: width 123cm, height 135cm, length 82cm capacity = 1362 litres safe fill = 1362 x 0.85 = 1158 litres Example: depth 45cm -> 454 litres (33% full)
| Figure | Value | Source | Verified |
|---|---|---|---|
| tank safe fill pct | 0.85 ratio | OFTEC guidance: tanks are filled to 80-90% of stated capacity to allow expansion | 2026-07-28 |
| vat domestic | 0.05 ratio | VAT Act 1994 Schedule 7A Group 1, domestic fuel reduced rate | 2026-07-28 |
Make and exact dimensions. The figures here are for representative internal dimensions of a 1,360 litre oil tank. Different makes vary by a few centimetres, so if your dip reading seems out of step, measure your own tank and use the custom builder.
Shape. This is an upright tank that fills close to linearly, so depth and litres track fairly evenly from bottom to top.
Safe fill. Order to the 85% figure of about 1,158 litres rather than the brim, so the oil has room to expand and the vent does not overflow during delivery.
Reading conditions. Keep the rod vertical and resting on the base, and allow for a little sludge at the bottom of an older tank. Treat the very lowest readings as a warning to reorder rather than a precise measure.
Read your tank and know roughly how much to order? Compare quotes from local suppliers and top up before you run low.
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