# Bearing Grease Quantity and Annual Cost Calculator

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

## Short answer

Relubrication quantity by the G = 0.005 x D x B rule, plus yearly grease consumption and spend across a bearing population.

## Category

maintenance

## Industry

Manufacturing

## Audience

- Lubrication technician
- Reliability engineer
- Maintenance planner

## Tool

**Kind:** calculator

**Currency:** $

**Inputs:**

#### Bearing outer diameter D

**Key:** od

**Type:** number

**Default:** 100

**Min:** 10

**Step:** 1

**Unit:** mm

#### Bearing width B

**Key:** width

**Type:** number

**Default:** 25

**Min:** 3

**Step:** 1

**Unit:** mm

#### Relubrication interval

**Key:** interval

**Type:** number

**Default:** 2000

**Min:** 50

**Step:** 50

**Unit:** h

#### Run hours per year

**Key:** run_hours

**Type:** number

**Default:** 6000

**Min:** 100

**Max:** 8760

**Step:** 100

**Unit:** h

#### Number of similar bearings

**Key:** count

**Type:** number

**Default:** 40

**Min:** 1

**Step:** 1

#### Grease price

**Key:** price

**Type:** number

**Default:** 8

**Min:** 0

**Step:** 0.5

**Unit:** per kg

#### Grease gun output per shot

**Key:** grease_gun_g

**Type:** number

**Default:** 1.5

**Min:** 0.1

**Step:** 0.1

**Unit:** g

**Help:** Check the gun with a scale. Many deliver 1 to 2 g per stroke.

**Outputs:**

#### Grease per relubrication

**Key:** g_shot

**Expr:** 0.005 * od * width

**Format:** decimal

**Primary:** true

**Description:** Grams, from the common G = 0.005 x D x B rule.

#### Gun strokes per bearing

**Key:** strokes

**Expr:** ceil(g_shot / grease_gun_g)

**Format:** integer

#### Relubrications per bearing per year

**Key:** events

**Expr:** run_hours / interval

**Format:** decimal

#### Grease used per year

**Key:** kg_year

**Expr:** g_shot * events * count / 1000

**Format:** decimal

#### Annual grease cost

**Key:** cost_year

**Expr:** kg_year * price

**Format:** currency

**Primary:** true

**Chart:**

#### Annual grease cost vs relubrication interval

**Type:** line

**X:** interval

**From:** 250

**To:** 8000

**Steps:** 32

**Series:**

- cost_year

**Disclaimer:** The rule is a generic starting point. Follow the bearing and grease supplier's guidance, and note that over-greasing raises temperature and can damage seals.

## Content

**Intro:** Over-greasing and under-greasing are both common causes of early bearing failure. This calculator gives a starting grease quantity from bearing size, then scales it to a yearly consumption and cost so you can build a lubrication plan.

**Sections:**

#### How to use it

**Body:** Read the outer diameter and width from the bearing designation or datasheet. Enter your relubrication interval, annual run hours and the number of similar bearings. Check your grease gun output by weighing ten strokes, and enter the grams per stroke. The result shows grams per shot, strokes per bearing, yearly kilograms and cost. The chart shows how cost reacts if you extend or shorten the interval.

#### The rule and its limits

**Body:** A widely used relubrication quantity is G = 0.005 x D x B, with G in grams and D and B in millimetres. The interval depends on speed, temperature, bearing type, grease and contamination, and is best taken from the supplier's chart or from condition monitoring. If ultrasonic or vibration readings stay healthy, the interval can sometimes be extended. If they rise after greasing, the interval or the quantity is probably wrong.

**Bullets:**

- Shorter intervals raise cost but lower the risk of dry running
- High temperature roughly halves grease life for every 15 degrees C rise
- Do not mix incompatible thickeners

#### Common mistakes

**Body:** Using the same shot for every bearing regardless of size is the most common error. Others include skipping a gun calibration, greasing a stationary bearing, and ignoring the drain or relief path so excess grease is forced into the winding of an electric motor. Record every greasing event against the equipment record so intervals can be reviewed against failures.

**Bullets:**

- Not calibrating the grease gun
- Greasing with the relief plug still in place
- Using one interval for dirty, hot and clean locations alike

**Cta:** Netray can generate lubrication routes and work orders from your ERP equipment list so each point gets the correct quantity and interval.

**Faq:**

#### How much grease should I add to a bearing?

**Answer:** A common starting estimate is 0.005 x outer diameter x width in grams, using millimetres. Always confirm against the bearing or motor manufacturer's nameplate or manual, which takes precedence.

#### How do I find the relubrication interval?

**Answer:** Use the grease or bearing supplier's interval chart, which accounts for speed factor, bearing type and temperature, then adjust using condition monitoring and inspection history.

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

**Answer:** Excess grease raises churning temperature, can blow out seals and, on motors, push grease into windings. Add slowly with the machine running where the manufacturer allows it.

#### Does one stroke equal one gram?

**Answer:** Not necessarily. Output varies by gun type and grease stiffness. Weigh ten strokes on a scale and divide to get the real value for your gun.

## Search terms

bearing grease quantity calculator, relubrication quantity formula, how much grease for a bearing, G = 0.005 D B grease, grease consumption per year, lubrication cost calculator, regreasing interval cost, grease gun shots per bearing

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