Oil Tank Measuring Chart of 275, 300, 330, 500, 550,1000 Gal + Calculator

How much oil is left in my tank?

That’s a common question that can be answered in two ways:

How many inches of oil are left in the tank?

What does the gauge read?

This page has exact answers to the question whichever way you measure how much heating oil remains in the tank.

Oil Tank Fullness Calculator

It’s simple to use. Try it out, and if you need directions, they are found below the oil tank fill calculator.

Oil Tank Measuring Calculator

1 – Choose your tank type – they are explained below

2 – Choose your Measuring Method

3 – Select the Fraction on the gauge, if using that method, or the number of inches in the tank using the slide bar if measuring that way

4 – Hit Calculator, and your Current Oil Amount and Oil Needed to Fill are shown.

Current Oil Amount and Oil Needed to Fill don’t add up to tank capacity!!!

That’s right. They should add up to around 87% to 90%, which is the percentage most heating oil companies will fill your tank.

Oil Tank Measuring by Chart and Gauge

Below, you will find oil fullness charts based on what the gauge says and by how many inches of heating oil is left.

Charts for tank sizes 275 gallons, 330 gallons, 500 gallons, 550 gallons and 1000 gallons are available – and separate tanks for horizontal and vertical tanks are produced for applicable tank sizes.

Oil Tank Measuring Chart by Gauge

Oil Tank Measuring

My gauge reads ¼. How much oil is in my tank?

Questions like that are common. And you have to know your tank capacity to do the math. But the math is done for you in our Current Oil Amount Measuring Chart and our Current Oil Amount Needed for Max Fill Chart.

They tell you how much is in the tank and how much can be filled to the point of maximum capacity. All common oil tank sizes are included.

Current Oil Amount Measuring Chart

Oil Tank SizeCurrent Oil (Gauge: 1/4)Current Amount (Gauge: 1/2)Current Amount (Gauge: 3/4)
275 Tank69 gallons138 gallons206 gallons
330 Tank83 gallons165 gallons248 gallons
500 Tank125 gallons250 gallons375 gallons
550 Tank138 gallons275 gallons413 gallons
1000 Tank250 gallons500 gallons750 gallons

How much oil is in my 275 gallon tank when the gauge is ¼?

69 gallons. Find 275 in the left column, the Oil Tank Size column. Then move to the right one column to the Current Oil (Gauge: 1/4) column, and you’ll see it says 69 gallons.

That’s how the chart works.

Current Oil Amount Need For Max Fill Chart

Oil Tank SizeCurrent Oil (Gauge: 0)Current Oil (Gauge: 1/4)Current Amount (Gauge: 1/2)Current Amount (Gauge: 3/4)
275 Tank240 gallons171 gallons102 gallons34 gallons
330 Tank300 gallons217 gallons165 gallons52 gallons
500 Tank450 gallons325 gallons200 gallons75 gallons
550 Tank500 gallons362 gallons225 gallons87 gallons
1000 Tank900 gallons650 gallons400 gallons150 gallons

My 500 gallon tank is empty. How many gallons to fill it?

450 gallons can be put in the tank to bring it to maximum capacity of 90%.

My 275 gallon take gauge is 1/2. How many gallons to fill it?

About 102. A half-full 275 gallon tank has about 138 gallons and can have a max fill of about 240 gallons, so it can take another 102 gallons.

And that is how that chart works!

Oil Tank Measuring Chart by Inches

The charts below cover all common tank sizes: 275, 330, 500, 550 and 1000 gallons in horizontal and vertical where applicable.

How to Measure Oil in the Tank: To use these charts, you obviously need to know the amount, in inches, of oil in the tank. We recommend a clean wood or metal measuring stick – but not a tape measure, since they’re harder to clean, and you might not want home heating oil residue gumming up your tape.

Either put inch markings on the stick or use a stick without markings, measure the oil, wipe off the stick, and measure the wet area.

Tip: Push the measuring rod straight down in the middle of the tank for the most accurate reading. A slanted measure will give you an inaccurate reading – you’ll think there is more oil in the tank than there is.

275 Gallon Oil Tank Chart (Horizontal)

Horizontal 275 gallon tanks are among the most popular.

How much oil is in my 275 gallon tank?

This chart makes it easy to tell both how much is left and how much you can put into it to bring it to 90% max capacity.

275 gallon oil tank chart (horizontal)

Inches From BottomCurrent Amount (Gal.)Amount Needed to Fill Tank(Gal.)
1″6235
2″14225
3″22220
4″31210
5″41200
6″52185
7″63175
8″74165
9″85155
10″96145
11″108130
12″119120
13″131110
14″14395
15″15485
16″16675
17″17860
18″18950
19″19940
20″21130
21″22220
22″23210
23″2400
24″2510
25″2600
26″2680
27″2750

There is 12” of oil in my tank. How much oil is left?

In a 275 gallon horizontal tank, there are about 119 gallons left. And if you want it full, order 120 gallons.

275 Gallon Oil Tank Chart (Vertical)

This chart works exactly the same. Since it is a vertical tank (60” long, 44” high and 27” wide), there is less oil per inch than in a horizontal 275 gallon tank.

275 gallon oil tank chart (vertical)

Inches From BottomCurrent Amount (Gal.)Amount Needed to Fill Tank(Gal.)
1″2250
2″5245
3″9240
4″14235
5″19230
6″25225
7″31215
8″37210
9″44205
10″51195
11″58190
12″65185
13″72180
14″80170
15″87160
16″94155
17″101145
18″108140
19″115135
20″123125
21″130120
22″137110
23″144105
24″15195
25″15890
26″16680
27″17375
28″18070
29″18760
30″19455
31″20145
32″20940
33″21630
34″22325
35″23020
36″23615
37″2435
38″2490
39″2540
40″2600
41″2650
42″2690
43″2720
44″2750

330 Gallon Oil Tank Chart (Horizontal)

330G heating oil tanks are pretty common too. If you’re not sure what size tank you have, it might indicate the size on the tank or on an invoice from the tank supplier. Contact them, if you still need the size info.

330 Gallon Oil Tank Chart (Horizontal)

Inches From BottomCurrent Amount (Gal.)Amount Needed to Fill Tank(Gal.)
1″7290
2″17280
3″27270
4″38260
5″49250
6″63235
7″75225
8″89210
9″102195
10″116180
11″129170
12″143155
13″157140
14″171125
15″185115
16″199100
17″21385
18″22770
19″23860
20″25345
21″26630
22″27820
23″28715
24″3010
25″3120
26″3210
27″3300

There are 10” left in my oil tank. How much oil is 10”?

116 gallons in a 330 gallon horizontal tank.

Find the number of inches in the left column. The center column shows approx. how much oil remains. The right column shows how much can be added to fill the tank to 90% full.

What are horizontal 330 gallon oil tank dimensions?

The size of most 330 gallon horizontal tanks is L x W x H: 72”x44”x27”

330 Gallon Oil Tank Chart (Vertical)

This chart is simple to use. After measuring the amount of oil in the tank, find the number of inches in the left column.

The current amount in gallons is shown in the middle column. The right column shows how many gallons are needed to fill it to 90%.

330 Gallon Oil Tank Chart (Vertical)

Inches From BottomCurrent Amount (Gal.)Amount Needed to Fill Tank(Gal.)
1″2300
2″6295
3″11285
4″17280
5″23275
6″30270
7″38260
8″45255
9″53245
10″61235
11″70230
12″78220
13″87210
14″96205
15″104195
16″113185
17″121175
18″130170
19″139160
20″147150
21″156145
22″164135
23″173125
24″182115
25″190110
26″199100
27″20790
28″21685
29″22575
30″23365
31″24255
32″25050
33″25940
34″26730
35″27525
36″28315
37″2915
38″2980
39″3050
40″3120
41″3180
42″3230
43″3260
44″3300

Note: The size of most 330 gallon vertical tanks is L x W x H: 72”x27”x44”

500 Gallon Oil Tank Chart

A 500 gallon oil tank is a good choice for a 3-4 bedroom home. Typical dimensions are 65”x48”, and most tanks are cylinders.

How much oil is left in your tank?

This simple-to-use chart is quite accurate.

500 Gallon Oil Tank Chart

Inches From BottomCurrent Amount (Gal.)Amount Needed to Fill Tank(Gal.)
1″3445
2″7440
3″13435
4″20430
5″28420
6″36415
7″45405
8″55395
9″65385
10″75375
11″86365
12″98350
13″109340
14″121325
15″133315
16″146305
17″158290
18″171275
19″184265
20″197250
21″210240
22″223225
23″237210
24″250200
25″263185
26″276175
27″290160
28″303145
29″316135
30″329120
31″341105
32″35495
33″36685
34″37970
35″39060
36″40245
37″41335
38″42425
39″43515
40″4455
41″4550
42″4640
43″4720
44″4800
45″4870
46″4930
47″4970
48″5000

How much oil is 12” in a 500 gallon tank?

98 gallons. And there’s room for about 350 gallons more.

That’s how to use the chart. Find the right number in the Inches column, and use the center and right columns to show current amount and potential fill amount to bring it to maximum 90% capacity.

550 Gallon Oil Tank Chart

A 550 gallon tank is usually 72” long and 48” tall. It’s a cylinder.

550 Gallon Oil Tank Chart

Inches From BottomCurrent Amount (Gal.)Amount Needed to Fill Tank(Gal.)
1″3495
2″8490
3″14485
4″22475
5″30470
6″40460
7″50450
8″60440
9″71425
10″83415
11″95405
12″108390
13″120380
14″134365
15″147350
16″161335
17″174325
18″188310
19″203285
20″217280
21″231265
22″246255
23″261235
24″275225
25″290210
26″304195
27″319180
28″333165
29″348115
30″362135
31″376125
32″390110
33″40395
34″41780
35″43070
36″44355
37″45545
38″46730
39″47920
40″49010
41″5010
42″5110
43″5200
44″5280
45″5360
46″5420
47″5480
48″5500

1000 Gallon Oil Tank Chart

1000 gallon oil tanks are cylinders. Most are about 130” long and 48” tall. They are often used in commercial rather than residential settings.

1000 Gallon Oil Tank Chart

Inches From BottomCurrent Amount (Gal.)Amount Needed to Fill Tank(Gal.)
1″5895
2″14885
3″26870
4″40860
5″55845
6″72825
7″90810
8″110790
9″130770
10″151745
11″173725
12″195705
13″219680
14″243655
15″267630
16″292605
17″317580
18″342555
19″368530
20″394505
21″420480
22″447450
23″473425
24″500400
25″526370
26″553345
27″579320
28″605295
29″631265
30″657240
31″683215
32″708190
33″733165
34″757140
35″781115
36″80495
37″82770
38″84950
39″87030
40″89010
41″9090
42″9270
43″9440
44″9600
45″9740
46″9850
47″9940
48″10000

FAQs

What is the maximum capacity of an oil tank?

90%. That’s the average. If you live in a very hot climate, though oil heating is rare there, your supplier might only want to fill the tank to 80% or 85%.

In a very cold climate, it’s possible that some suppliers might fill a tank to slightly above 90%.

This is because oil expands more in high temperatures.

What is maximum oil tank capacity by size?

At 85% to 90%, here are tank sizes and max fill capacity.

  • 275: 220 to 248 gallons
  • 300: 255 to 270 gallons
  • 330: 280 to 297 gallons
  • 500: 425 to 450 gallons
  • 550: 468 to 495 gallons
  • 1000: 850 to 900 gallons

When should I have my tank refilled?

Most suppliers suggest ordering a fill when your tank gets to 1/4 if you have a gauge.

If you use a measuring stick, then you should order more oil when the tank is at about 15% to 20%. Use the charts above to determine how many inches that is for the tank size you have.

My tank doesn’t have a gauge. Can I add one?

Yes. Ask your oil supplier about adding a gauge, or consider adding your own ultrasonic gauge with WiFi for convenience.

Oil Tanks – H or V?

“H” is horizontal, and “V” is vertical.

However, even vertical tanks are wider than they are tall. Does that make sense?

For example, a 275 gallon tank is usually 60” long, regardless of whether it is horizontal or vertical.

Width and height are where the two differ.

  • Horizontal: 27” high or tall, and 44” wide
  • Vertical: Just the opposite – 44” high or tall, and 27” wide.

Similar differences are 330-gallon tanks and a few other sizes available in both vertical and horizontal options.

Written by

Rene has worked 10 years in the HVAC field and now is the Senior Comfort Specialist for PICKHVAC. He holds an HVAC associate degree and EPA & R-410A Certifications.
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