Dip chart calculator for petrol pump tanks: read litres between two lines

Short answer

Type two neighbouring rows from your own tank's calibration chart (dip and litres for each) and your dip reading in between. The tool reads the litres in a straight line between the rows and shows the sum. Only your tank's own calibrated chart counts: every tank has its own, and this page carries none. The Marketing Discipline Guidelines 2024 (MDG 2024), the oil companies' rules for their dealers, ask for each tank's product and water dip every morning MDG 1.3.

The Marketing Discipline Guidelines 2024 (MDG 2024) are the oil companies' rules for their dealers, and bind dealers through the dealership agreement. This page is a plain-language explanation by MDG Services (a brand of VRUOOM Private Limited). It is not the official text and is not connected with or approved by IndianOil, BPCL, HPCL or any government body, so please check the current guidelines and circulars on the oil companies' own websites and with your oil company officer before you act.

Checked against the Marketing Discipline Guidelines 2024 (Ver. 1, effective 24.10.2024) on 26 October 2026. Published by MDG Services on 26 October 2026.

Read the litres for a dip that falls between two lines of your own tank's chart.

Read the litres for your dip

Use your own tank's chart. Every tank has its own. No chart is held here.

Row 1: dip (cm)

Row 1: litres

Row 2: dip (cm)

Row 2: litres

Your dip readingIn the same unit as the rows, for example 120.5 Water in the tank, in litres (optional)Only if your dip is the whole liquid height, water included. Read the water's litres from the same chart.

Type the two rows and your dip, then press the button.

How to use it

In your tank's own chart, find the two lines either side of your dip. Copy the dip and litres of each.
Type your dip reading in the same unit.
Press the button. The litres come with the sum, so you can check it by hand.

The sum is litres = L1 + (dip − d1) × (L2 − L1) ÷ (d2 − d1), where row 1 is the lower one.

For example, with made-up rows that belong to no tank: 120 cm is 9,000 litres and 121 cm is 9,060 litres. A dip of 120.5 is halfway, so 9,000 + 0.5 × 60 = 9,030 litres. With 40 litres of water taken off, the product is 8,990 litres.

Note: only your tank's own calibrated chart counts, and reading in a straight line between two lines is general practice, not an MDG rule.

What MDG asks for

MDG does not use the words dip chart. It asks for the product and water dip of each tank every morning MDG 1.3, and for the water dip daily MDG 1.4.1(b). The stock check starts from the opening dip and ends at the closing dip MDG Annexure 9 MDG 5.1.11.

See what a dip is, the daily stock register and stock variation.

Questions dealers ask

01How to read a dip chart at a petrol pump?

Find your dip in the dip column of your tank's own chart and read the litres beside it. If the dip falls between two lines, the tool reads the litres in a straight line between them. That is general practice, not an MDG rule.

02Does MDG give a petrol pump dip chart?

No. MDG does not use the term. It asks for the product and water dip of each tank every morning MDG 1.3. Use the calibrated chart that belongs to your tank, and ask your oil company if you do not have it.

03Dip to litre conversion: can one chart serve all tanks?

No. Tanks differ in size and shape, so the same dip means different litres in different tanks. Only your tank's own calibrated chart gives the litres.

04What if my dip is between two lines of the chart?

Take the two rows either side of it and type them with your dip. General practice, not an MDG rule: the closer the two rows, the closer the result is to the chart.

05How do I take the water out of the litres?

General practice, not an MDG rule: read the litres for the water dip from the same chart, using this tool again with the rows around the water dip, and type them in the water box. Do this only if your dip reading is the whole liquid height, water included. MDG asks for the water dip daily MDG 1.4.1(b).

06Can I use millimetres instead of centimetres?

Yes. Use the same unit in all three dip boxes and the litres come out the same.

07Does the calculator save what I type?

No. The sum is worked out on your own phone or computer, and nothing you type is stored or sent.

Read the official text: Marketing Discipline Guidelines 2024 (PDF on Bharat Petroleum's website) (also published on iocl.com).

What is dip at a petrol pump: dip rod, dip chart and water dipA dip is the height of fuel or water in a tank, read with a dip rod. How it becomes litres, when MDG 2024 asks for it, and how it feeds the stock register.

Petrol pump daily stock register: what MDG 2024 requiresWhat a petrol pump's daily stock register holds under Marketing Discipline Guidelines 2024: morning readings, dips, water dip, testing litres, receipts.

Petrol pump stock variation: the permissible limit (MDG 2024)Stock variation at a petrol pump under the Marketing Discipline Guidelines 2024: the 4% of tank stock, other allowances, and the action beyond the limit.

Water finding paste for petrol, diesel and ethanol blendsWhat Marketing Discipline Guidelines 2024 say about water finding paste for petrol, diesel and ethanol blends, the daily water dip and the ethanol check.

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