# Bearing Grease Quantity Calculator

> Source: https://netray.co/tools/bearing-grease-quantity-calculator
> Publisher: Netray (netray.co), AI and integration engineering for ERP and manufacturing systems.
> Section: Free Tools

## Short answer

Estimate regrease quantity per bearing, grease gun shots, and annual grease use, cartridges and cost for any number of bearings.

## Category

maintenance

## Audience

- Lubrication technician
- Maintenance manager
- Reliability engineer

## Tool

**Kind:** calculator

**Currency:** $

**Inputs:**

#### Bearing outer diameter (D)

**Key:** od

**Type:** number

**Default:** 80

**Min:** 10

**Step:** 1

**Unit:** mm

**Help:** From the bearing designation or data sheet.

#### Bearing width (B)

**Key:** width

**Type:** number

**Default:** 18

**Min:** 3

**Step:** 1

**Unit:** mm

#### Regrease interval

**Key:** interval

**Type:** number

**Default:** 90

**Min:** 1

**Step:** 1

**Unit:** days

#### Number of bearings

**Key:** bearings

**Type:** number

**Default:** 40

**Min:** 1

**Step:** 1

#### Grease gun output per shot

**Key:** shot

**Type:** number

**Default:** 1.5

**Min:** 0.1

**Step:** 0.1

**Unit:** g

**Help:** Check your gun: many deliver 1 to 2 g per stroke.

#### Cartridge size

**Key:** cartridge

**Type:** select

**Default:** 400

**Options:**

##### 400 g cartridge

**Value:** 400

##### 450 g cartridge

**Value:** 450

##### 1000 g tube

**Value:** 1000

#### Grease price

**Key:** price

**Type:** number

**Default:** 9

**Min:** 0

**Step:** 0.5

**Unit:** per kg

**Outputs:**

#### Regrease quantity per bearing

**Key:** qty_g

**Expr:** 0.005 * od * width

**Format:** decimal

**Primary:** true

**Description:** G = 0.005 x D x B in grams, a common rule of thumb for ball and roller bearings.

#### Grease gun shots per bearing

**Key:** shots

**Expr:** ceil(qty_g / shot)

**Format:** integer

**Description:** Rounded up to whole strokes.

#### Regrease visits per year

**Key:** visits

**Expr:** 365 / interval

**Format:** decimal

#### Annual grease for all bearings

**Key:** annual_g

**Expr:** qty_g * visits * bearings

**Format:** number

#### Annual grease (kg)

**Key:** annual_kg

**Expr:** annual_g / 1000

**Format:** decimal

**Primary:** true

#### Cartridges per year

**Key:** cartridges

**Expr:** ceil(annual_g / cartridge)

**Format:** integer

#### Annual grease cost

**Key:** cost

**Expr:** annual_kg * price

**Format:** currency

**Chart:**

#### Annual grease use vs regrease interval

**Type:** line

**X:** interval

**From:** 15

**To:** 180

**Steps:** 12

**Series:**

- annual_kg

**Disclaimer:** The 0.005 x D x B rule is a general estimate for regreasing. Always follow the bearing or equipment manufacturer's guidance, and adjust for speed, temperature and contamination.

## Content

**Intro:** Too little grease starves a bearing and too much overheats it. This calculator applies the common rule of 0.005 times outer diameter times width to give a regrease quantity in grams, then turns it into gun shots, annual kilograms and cost.

**Sections:**

#### How to use the calculator

**Body:** Enter the bearing's outer diameter and width in millimetres, found on the bearing data sheet or by measuring. Add the regrease interval, the number of similar bearings, the output of your grease gun per stroke and your grease price. The result shows grams per bearing, shots per bearing, grams per year and the cost. Sweep the chart to see how interval changes consumption.

#### The formula and its limits

**Body:** The widely quoted estimate for relubrication quantity is G = 0.005 x D x B, where G is grease in grams and D and B are outer diameter and width in millimetres. For an 80 mm by 18 mm bearing that gives 7.2 g. Treat it as a starting point: electric motor bearings with a purge outlet differ from sealed housings, and some manufacturers give their own figures. Where a manual conflicts with the rule, the manual wins.

**Bullets:**

- Do not mix grease types unless compatibility is confirmed
- Clean the nipple before every shot
- Grease slowly while the machine runs where safe and allowed
- Use an outlet or purge path to prevent over-pressure

#### Using the annual numbers

**Body:** Annual kilograms and cartridges show what to stock and buy. If your plan uses ten different products, repeat the calculation per grease type. The cost output helps make the case for ultrasonic or condition-based greasing, which can reduce both over-greasing and bearing failures; if a bearing set costs more than a year of grease, getting the schedule right usually pays for itself.

#### Common mistakes

**Body:** Common errors are using bore diameter instead of outer diameter, forgetting that gun output varies by gun and grease stiffness, and applying the formula to bearings that use oil. Calibrate your gun by pumping ten strokes onto a scale and dividing by ten.

**Cta:** If lubrication quantities are managed by hand, we can help connect point lists, intervals and stock levels to your ERP so purchasing follows the real schedule.

**Faq:**

#### Is the 0.005 x D x B formula accurate?

**Answer:** It is a widely used estimate and gives sensible quantities for typical bearings, but it is not a substitute for the manufacturer's recommendation. Speed, temperature, bearing type and housing design all matter. Use it for planning, and refine with condition monitoring.

#### How do I measure my grease gun output?

**Answer:** Pump ten strokes into a container on a scale, subtract the empty weight and divide by ten. Do it with the grease you actually use, since stiffness and temperature change output. Many hand guns deliver roughly one to two grams per stroke.

#### Can I use this for oil-lubricated bearings?

**Answer:** No. The rule applies to grease. Oil-lubricated bearings are managed by sump level, oil change intervals and analysis. Use the lubrication route worksheet to schedule oil checks and changes by volume instead.

#### What happens if I over-grease?

**Answer:** Excess grease causes churning, raising temperature and speeding oil separation, and can push past seals into motor windings. Over-greasing is among the most common causes of premature bearing failure, so apply measured quantities and use a purge path where provided.

## Search terms

bearing grease quantity calculator, how much grease for a bearing, regrease quantity formula, grease gun shots calculator, bearing relubrication amount, grease consumption calculator, bearing grease interval and quantity

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