# Dip Density Calculator > Dip Density Calculator is a free Android app and website for Indian petrol pumps: tank dip to litres for BPCL, IOCL and HPCL tank models, and density at 15 °C from ASTM D1250 Table 53B. No ads, works offline. Dip Density Calculator is made by Wats Infosystems Private Limited (https://watsinfo.com) for petrol pump owners, dealers, managers and DSMs in India. The Android app is free on Google Play (https://play.google.com/store/apps/details?id=com.watsinfo.dipdensity). It is independent and not made by any oil company. Every page here also has a markdown version at the same address ending in .md. Contact: support@watsinfo.com. ## Core pages - [Dip Density Calculator](https://dipdensity.watsinfo.com/index.md): Dip Density Calculator turns a tank dip into litres and a hydrometer reading into density at 15 °C, for BPCL, IOCL and HPCL petrol pumps. Free Android app with free web calculators. - [Free calculators for petrol pumps](https://dipdensity.watsinfo.com/tools.md): Twelve free calculators for Indian petrol pumps that run in the browser. - [ASTM Table 53B: density at 15 °C](https://dipdensity.watsinfo.com/table-53b.md): A Table 53B look-up: hydrometer reading and temperature to density at 15 °C, answer only. - [Guides for petrol pumps](https://dipdensity.watsinfo.com/guides.md): Plain guides on Table 53B, density, dip charts, tankers, stock variation and the daily checks. ## Calculators - [Density at 15 °C calculator](https://dipdensity.watsinfo.com/tools/density-at-15-calculator.md): A free calculator that turns a hydrometer reading and its temperature into density at 15 °C using the printed ASTM D1250-80 Table 53B, with a check against the BS-VI petrol and diesel limits. - [Dip to litres calculator](https://dipdensity.watsinfo.com/tools/dip-to-litres-calculator.md): A free tank dip chart calculator for 15+ BPCL, IOCL and HPCL underground tank models: dip in cm, mm or cm-and-bars to litres, with water dip, space left and percent full. - [Density variation calculator](https://dipdensity.watsinfo.com/tools/density-variation-calculator.md): A free calculator for the MDG 2024 tanker density check: hydrometer reading to density at 15 °C by Table 53B, compared with the invoice density, within ±3.0 kg/m³ or not. - [Tanker unloading calculator](https://dipdensity.watsinfo.com/tools/tanker-unloading-calculator.md): A free calculator for a tanker's delivery into one underground tank: litres from the dip before and after, plus sales during unloading, compared with the invoice litres. - [Stock variation calculator](https://dipdensity.watsinfo.com/tools/stock-variation-calculator.md): A free calculator for MS and HSD stock verification as set out in MDG 2024 Annexure 9: book stock from opening dip, receipts, shrinkage and meter sales compared with closing dip stock, ±4%. - [Volume correction factor calculator (Table 54B)](https://dipdensity.watsinfo.com/tools/volume-correction-factor-calculator.md): A free ASTM D1250-80 Table 54B calculator: litres at the observed temperature and density at 15 °C to the volume correction factor and litres at 15 °C. - [Tank space (ullage) calculator](https://dipdensity.watsinfo.com/tools/tank-space-calculator.md): A free ullage calculator for BPCL, IOCL and HPCL underground tanks: space in the tank from the current dip, whether a tanker load fits, and the dip after unloading. - [Litres to dip calculator](https://dipdensity.watsinfo.com/tools/litres-to-dip-calculator.md): A free calculator that reads a petrol pump tank's dip chart backwards: litres to dip in cm, mm and cm-and-bars, for 15+ BPCL, IOCL and HPCL tank models. - [Horizontal tank volume calculator](https://dipdensity.watsinfo.com/tools/tank-volume-calculator.md): A free calculator for the litres in any horizontal cylindrical tank with flat ends, from inside diameter, length and dip in cm, with optional deadwood. - [Evaporation loss allowance calculator](https://dipdensity.watsinfo.com/tools/evaporation-loss-calculator.md): A free calculator for the evaporation and handling loss allowance in MDG 2024 clause 5.1.11, by fuel and yearly sale, with monthly and daily averages. - [5 litre measure test calculator](https://dipdensity.watsinfo.com/tools/5-litre-measure-test-calculator.md): A free checker for the daily 5 litre measure test: neck reading in ml to delivered quantity and percent error, against the ±25 ml (0.5%) permissible error and the MDG 2024 steps. - [Fuel litres to kg calculator](https://dipdensity.watsinfo.com/tools/fuel-weight-calculator.md): A free converter between litres at 15 °C and kilograms for petrol, diesel and other fuels, using the density at 15 °C. ## Guides - [The 5 litre measure test](https://dipdensity.watsinfo.com/guides/5-litre-measure-test.md): How the daily 5 litre measure test works at Indian petrol pumps: the stamped measure, reading the neck scale, the ±0.5% (±25 ml) permissible error, and the MDG 2024 actions for 10 to 25 ml and beyond. - [BPCL tank dip chart](https://dipdensity.watsinfo.com/guides/bpcl-tank-dip-chart.md): BPCL underground tank models (8.4 to 70 KL) with inside diameter, length and full capacity, and litres every 10 cm of dip, worked out as horizontal cylinders and checked against BPCL drawings RE-DRG-381 and RE-DRG-382. - [The daily density check at a petrol pump](https://dipdensity.watsinfo.com/guides/density-check-at-petrol-pump.md): Explains the density checks required of Indian petrol pump dealers by MDG 2024: the morning density before sales by 10 AM, tanker compartment checks within ±3.0 kg/m³, the composite density after decanting, and the density register. - [How much density variation is allowed?](https://dipdensity.watsinfo.com/guides/density-variation-limit.md): Explains the MDG 2024 rule that a tanker's density at 15 °C, by ASTM Table 53B, must be within ±3.0 kg/m³ of the invoice density, how to check it compartment by compartment, and the steps when it fails. - [How to read a dip rod: cm, mm and bars](https://dipdensity.watsinfo.com/guides/dip-rod-cm-mm-and-bars.md): Explains how to read dip rods marked in mm, or in cm with four 2 mm bars between each centimetre, and why writing '58.4' for 58 cm and 4 bars as 58.4 cm costs tens of litres. - [The dip to litres formula](https://dipdensity.watsinfo.com/guides/dip-to-litres-formula.md): Derives and works the formula for the litres in a horizontal flat-ended cylindrical fuel tank at a given dip, from the circular segment area, with a full numerical example and IOCL deadwood. - [Ethanol-blended petrol: what changes at the pump](https://dipdensity.watsinfo.com/guides/ethanol-blended-petrol-e20.md): What ethanol-blended petrol (E10, E12, E15, E20) means for a petrol pump under MDG 2024: the same 720–775 kg/m³ density range, the BIS standards, the special water-finding paste, and water-induced phase separation. - [How much evaporation loss is allowed?](https://dipdensity.watsinfo.com/guides/evaporation-loss-allowance.md): The evaporation and handling loss allowances for MS (0.75%/0.60%) and HSD (0.25%/0.20%) in MDG 2024 clause 5.1.11, how they apply around the 600 KL annual average, and the shrinkage allowance. - [The filter paper test for petrol](https://dipdensity.watsinfo.com/guides/filter-paper-test-for-petrol.md): Explains the filter paper test for petrol at Indian retail outlets: MDG 2024 requires Whatman 2 paper for customers on demand; how the test is done, what a clean result looks like, and its limits. - [How to calculate density at 15 °C](https://dipdensity.watsinfo.com/guides/how-to-calculate-density-at-15-degree.md): A step-by-step guide to finding the density of petrol or diesel at 15 °C from a hydrometer reading and temperature with ASTM Table 53B, including interpolation and two worked examples. - [How to check petrol quality and quantity at a pump](https://dipdensity.watsinfo.com/guides/how-to-check-petrol-quality-at-petrol-pump.md): A customer's guide to checking petrol and diesel quality and quantity at Indian petrol pumps, based on what MDG 2024 requires every dealer to provide: meter zero, filter paper test, density display, 5 litre measure test and the complaint book. - [How to take a dip reading](https://dipdensity.watsinfo.com/guides/how-to-take-a-dip-reading.md): A practical guide to dipping an underground petrol or diesel tank: when to dip, lowering and reading the dip rod, water-finding paste, repeat readings, and converting to litres. - [HPCL tank dip chart](https://dipdensity.watsinfo.com/guides/hpcl-tank-dip-chart.md): HPCL 9, 16, 22 and 35 KL underground tank models from HP printed calibration charts, with inside diameter, length, full capacity and litres every 10 cm of dip. - [How to use a hydrometer: the jar test](https://dipdensity.watsinfo.com/guides/hydrometer-jar-test.md): A practical guide to the hydrometer jar test for petrol and diesel density: equipment, sampling, reading the meniscus, temperature, and common mistakes, leading to density at 15 °C by Table 53B. - [IOCL tank dip chart](https://dipdensity.watsinfo.com/guides/iocl-tank-dip-chart.md): IOCL (IndianOil) 15 KL and 20 KL underground tank models with the deadwood printed on IndianOil charts under IS 2166-1963, and litres every 10 cm of dip. - [What is the density of petrol and diesel in India?](https://dipdensity.watsinfo.com/guides/petrol-diesel-density-range.md): The density limits at 15 °C for BS-VI petrol (IS 2796, 720–775 kg/m³) and BS-VI diesel (IS 1460, 810–845 kg/m³) in India, as listed in MDG 2024, and what to do when a reading falls outside. - [What every petrol pump must give you](https://dipdensity.watsinfo.com/guides/petrol-pump-customer-rights.md): Lists the facilities and services every Indian retail outlet must provide to customers under MDG 2024 clause 1.6 and 5.1.14: air, clean toilet open to transit travellers, telephone, first aid, displayed prices and hours, complaint book and company contacts. - [The petrol pump daily checklist](https://dipdensity.watsinfo.com/guides/petrol-pump-daily-checklist.md): A daily checklist for Indian petrol pump dealers drawn from MDG 2024: morning product and water dips, morning density by 10 AM, nozzle tests, W&M seal checks, leak checks, stock and price display, and required registers. - [How big are petrol pump underground tanks?](https://dipdensity.watsinfo.com/guides/petrol-pump-tank-capacity.md): Lists common underground storage tank capacities at Indian BPCL, IOCL and HPCL petrol pumps with inside diameter and length, and explains nominal size versus full capacity and choosing the right dip chart. - [Stock variation: the 4% rule](https://dipdensity.watsinfo.com/guides/stock-variation-4-percent-rule.md): Explains MS and HSD stock verification at Indian petrol pumps per MDG 2024 clause 5.1.11 and Annexure 9: book stock against dip stock, the ±4% normal operational variation, evaporation allowances and what happens beyond the limit. - [Table 53B and Table 54B: what is the difference?](https://dipdensity.watsinfo.com/guides/table-53b-vs-54b.md): Explains the difference between ASTM D1250 Table 53B (observed density to density at 15 °C) and Table 54B (volume correction factor from density at 15 °C and temperature), with a worked example. - [How to receive and decant a tanker](https://dipdensity.watsinfo.com/guides/tanker-decantation-procedure.md): A step-by-step guide to tank lorry receipt and decantation at an Indian petrol pump, following MDG 2024 clauses 1.1 and 1.2: documents, seals, dips, water, density, samples, decanting and records. - [Tanker shortage: how to find it and what to do](https://dipdensity.watsinfo.com/guides/tanker-shortage.md): Explains tanker shortages at Indian petrol pumps: checking compartment dips against the calibration certificate before decanting, the MDG 2024 make-up procedure, and reading tank dips after unloading. - [The three-tier sampling procedure](https://dipdensity.watsinfo.com/guides/three-tier-sampling-procedure.md): Explains the MDG 2024 three-tier sampling procedure for MS and HSD: daily samples at supply locations, tank lorry retention samples drawn by the dealer, the transporter's set, and random sampling by oil company officials. - [Totalizer readings: how sales are counted](https://dipdensity.watsinfo.com/guides/totalizer-meter-reading.md): Explains petrol pump totalizer (meter) readings: a lifetime counter per nozzle, sales as closing less opening, test fuel returned to the tank, and the Weights and Measures seals required by MDG 2024. - [Water in the tank: the water dip](https://dipdensity.watsinfo.com/guides/water-in-underground-tank.md): How petrol pumps check for water in underground tanks and tank lorries with water-finding paste, the daily water dip record required by MDG 2024, and the special care needed with ethanol-blended petrol. - [What are MS and HSD?](https://dipdensity.watsinfo.com/guides/what-is-ms-and-hsd.md): Explains the petrol pump terms MS (Motor Spirit, petrol, IS 2796) and HSD (High Speed Diesel, IS 1460), with their BS-VI density ranges, and related terms used on invoices and in the MDG. - [What is ASTM Table 53B?](https://dipdensity.watsinfo.com/guides/what-is-table-53b.md): Explains ASTM D1250-80 Table 53B: the table that converts an observed density to density at 15 °C for refined products, how to read it and why Indian petrol pumps must use it. - [Why is density corrected to 15 °C?](https://dipdensity.watsinfo.com/guides/why-density-is-corrected-to-15-degree.md): Explains why petroleum density and volume are corrected to the reference temperature of 15 °C, with figures for how much petrol and diesel expand per degree. - [Why do two tanks of the same size have different dip charts?](https://dipdensity.watsinfo.com/guides/why-same-size-tanks-have-different-dip-charts.md): Explains why underground fuel tanks of the same nominal capacity have different dip charts: the chart depends on inside diameter and length. With BPCL's two 20 KL models as the example. ## Hindi (हिंदी) - [पेट्रोल पंप के लिए गाइड](https://dipdensity.watsinfo.com/hi/guides.md): डिप, डेंसिटी, टैंकर और स्टॉक पर हिंदी गाइड। - [15 °C पर डेंसिटी कैसे निकालें](https://dipdensity.watsinfo.com/hi/guides/density-kaise-nikale.md): पेट्रोल पंप पर जार टेस्ट से 15 °C पर डेंसिटी निकालने का तरीका हिंदी में: सैंपल, हाइड्रोमीटर, थर्मामीटर, Table 53B और डेंसिटी रजिस्टर। - [टैंक का डिप कैसे लें](https://dipdensity.watsinfo.com/hi/guides/dip-kaise-le.md): पेट्रोल और डीज़ल टैंक का डिप लेने का तरीका हिंदी में: बिक्री रोकना, डिप रॉड पढ़ना, वॉटर डिप, दो बार रीडिंग और लीटर में बदलना। - [डिप से लीटर कैसे निकालें](https://dipdensity.watsinfo.com/hi/guides/dip-se-litre.md): अंडरग्राउंड फ्यूल टैंक में डिप से लीटर का फ़ॉर्मूला हिंदी में, BPCL 20 KL टैंक का हिसाब, IOCL डेडवुड और एक साइज़ के दो मॉडल का फ़र्क। - [MS और HSD क्या है?](https://dipdensity.watsinfo.com/hi/guides/ms-hsd-kya-hai.md): पेट्रोल पंप के शब्द MS (मोटर स्पिरिट, पेट्रोल, IS 2796) और HSD (हाई स्पीड डीज़ल, IS 1460) हिंदी में, BS-VI डेंसिटी के साथ। - [पेट्रोल और डीज़ल की डेंसिटी कितनी होती है?](https://dipdensity.watsinfo.com/hi/guides/petrol-diesel-density.md): भारत में BS-VI पेट्रोल (IS 2796, 720–775 kg/m³) और डीज़ल (IS 1460, 810–845 kg/m³) की 15 °C पर डेंसिटी सीमा, MDG 2024 के अनुसार। - [पेट्रोल की क्वालिटी और मात्रा कैसे जाँचें](https://dipdensity.watsinfo.com/hi/guides/petrol-ki-quality-kaise-jaanche.md): ग्राहकों के लिए हिंदी गाइड: MDG 2024 के अनुसार पेट्रोल पंप पर मीटर ज़ीरो, फ़िल्टर पेपर टेस्ट, डेंसिटी, 5 लीटर माप और शिकायत पुस्तिका। - [स्टॉक वेरिएशन: 4% का नियम](https://dipdensity.watsinfo.com/hi/guides/stock-variation.md): MDG 2024 क्लॉज़ 5.1.11 और Annexure 9 के अनुसार पेट्रोल-डीज़ल स्टॉक वेरिफ़िकेशन हिंदी में: बुक स्टॉक, डिप स्टॉक, ±4%, इवैपोरेशन लॉस और सीमा से बाहर होने पर कार्रवाई। - [ASTM Table 53B क्या है?](https://dipdensity.watsinfo.com/hi/guides/table-53b-kya-hai.md): ASTM D1250-80 Table 53B की हिंदी में जानकारी: हाइड्रोमीटर रीडिंग और तापमान से 15 °C पर डेंसिटी, टेबल कैसे पढ़ें और MDG में इसका नियम। - [टैंकर कैसे रिसीव और डीकैंट करें](https://dipdensity.watsinfo.com/hi/guides/tanker-decantation.md): MDG 2024 क्लॉज़ 1.1 और 1.2 के अनुसार टैंकर रिसीव और डीकैंट करने के कदम हिंदी में: कागज़, सुरक्षा, सील, डिप, पानी, डेंसिटी, सैंपल, शॉर्टेज और रिकॉर्ड। ## Machine-readable - [Sitemap](https://dipdensity.watsinfo.com/sitemap-index.xml) - [Privacy policy](https://dipdensity-api.watsinfo.com/privacy)