ES
Home › Calculators › OEE Calculator

OEE Calculator

Measure how well a machine or line uses its planned production time. Enter the shift, stops, ideal cycle time and part counts to get availability, performance, quality and overall OEE, with a breakdown of where the time was lost.

Last updated:

Time
min
min

Excluded from OEE. Planned production time = shift − planned stops

min

Breakdowns, changeovers, waiting for material

Speed

The fastest the machine can run one part under ideal conditions

Count
units
units

Exclude scrap and parts that needed rework

Enter your values to see the result.
Advertisement
Advertisement

How to use the OEE Calculator

  1. Enter the shift length and the planned stops (breaks, meals) that are excluded from OEE.
  2. Enter unplanned downtime: breakdowns, changeovers and other stops during planned time.
  3. Enter the ideal cycle time or ideal rate and pick its unit.
  4. Enter the total and good counts for the same period.
  5. Read OEE and its three factors, then use the loss breakdown to decide what to improve first.

OEE formulas

FactorFormulaExample
Planned production timeshift length − planned stops480 − 60 = 420 min
Run timeplanned production time − downtime420 − 47 = 373 min
Availabilityrun time ÷ planned production time373 ÷ 420 = 88.81%
Performance(ideal cycle time × total count) ÷ run time(1 s × 19,271) ÷ 22,380 s = 86.11%
Qualitygood count ÷ total count18,848 ÷ 19,271 = 97.80%
OEEavailability × performance × quality0.8881 × 0.8611 × 0.9780 = 74.79%

OEE benchmarks

OEEWhat it usually means
100%Perfect production: only good parts, at ideal speed, with no stops
85%+World-class for discrete manufacturing; a long-term goal for many plants
60–85%Typical; there is clear room for improvement
40–60%Low, but common when a company first starts measuring OEE
Under 40%Large losses; check downtime and the ideal cycle time first

How to improve each factor

  • Availability: log every stop with a reason, attack the longest and most frequent ones, and shorten changeovers with SMED (quick-changeover) methods.
  • Performance: count minor stops and slow cycles; jams, misfeeds and running below rated speed often hide here because no one records them as downtime.
  • Quality: track scrap and rework at start-up separately from steady running, and fix the root cause of the most common defect.
  • Measure consistently. Keep the same definitions of planned stops and ideal cycle time from shift to shift, or the trend will not mean much.

Frequently asked questions

What is OEE?

Overall Equipment Effectiveness (OEE) is the share of planned production time that is truly productive: making only good parts, as fast as possible, with no stops. 100% OEE means perfect production; it is the product of availability, performance and quality.

How do you calculate OEE?

OEE = Availability × Performance × Quality. Availability = run time ÷ planned production time. Performance = (ideal cycle time × total count) ÷ run time. Quality = good count ÷ total count. A shortcut gives the same answer: OEE = (good count × ideal cycle time) ÷ planned production time.

What is a good OEE score?

85% is widely quoted as world class for discrete manufacturing (about 90% availability, 95% performance and 99.9% quality). Around 60% is typical, and 40% is common for plants just starting to measure. Comparing a machine with its own history is often more useful than comparing with other plants.

What is the difference between planned stops and downtime?

Planned stops, such as breaks, meals or no scheduled orders, are removed before OEE is calculated, so they do not lower the score. Unplanned stops such as breakdowns, material shortages and usually changeovers count as downtime and reduce availability.

Why is my performance above 100%?

Performance cannot truly exceed 100%. If it does, the ideal cycle time is set slower than the machine can really run, or the counts or run time are wrong. Use the fastest cycle time the equipment is designed for, such as the nameplate speed.

What are the six big losses in OEE?

Availability losses are equipment failures and setups or adjustments. Performance losses are idling and minor stops, and reduced speed. Quality losses are process defects and reduced yield at start-up. The time breakdown in this calculator groups lost time into these three categories.

Does good count include reworked parts?

No. For OEE, good count means parts that passed the first time without rework. Reworked parts count in the total but not in the good count, because the time spent making them the first time was not productive.

Are all the tools on FreeToolCabin tested for quality and accuracy?

Yes! Every tool on our site undergoes automated Q/A testing in real browser environments to ensure high precision, correct output, and zero errors. If you happen to spot a bug or have a suggestion, please contact us at [email protected] and our team will review it right away.

Related tools

Takt Time CalculatorTakt time from available time and demand, plus stations needed and a bottleneck check.Six Sigma CalculatorDPMO, yield and sigma level from defects, with the 1.5 sigma shift and a conversion table.Percent Yield CalculatorPercent yield from actual and theoretical yield, or theoretical yield from moles and formulas.Percentage CalculatorWork out percentages, increases and decreases.Speed Distance Time CalculatorSolve for speed, distance or travel time and get your arrival time.Half Life CalculatorSolve radioactive decay for amount left, half-life, time or initial amount, with a curve.Kinetic Energy CalculatorSolve KE = ½mv² and PE = mgh for energy, mass, speed or height, with unit conversions.Projectile Motion CalculatorRange, max height, flight time and impact speed of a projectile, with an animated trajectory.Free Fall CalculatorFall time and impact velocity from a height, or height from time or speed, with a chart and table.Meeting Cost CalculatorWork out what a meeting really costs from attendees and salaries, with a live cost ticker.Velocity CalculatorSolve v = d/t and a = Δv/t for any variable, plus a SUVAT solver for any three kinematics values.Torque CalculatorSolve τ = r·F·sin θ for torque, force, lever arm or angle, and convert torque to power at any rpm.Wavelength Frequency CalculatorConvert frequency to wavelength and back for light, radio or sound, with photon energy and band.Acceleration CalculatorAcceleration from velocity change and time, distance and time, or force and mass.Force CalculatorSolve F = ma for force, mass or acceleration, plus weight on every planet.Density CalculatorSolve density, mass or volume with unit conversion and a table of common material densities.Momentum CalculatorCalculate momentum (p = mv), mass, velocity, impulse and momentum change with unit conversion.Potential Energy CalculatorGravitational PE = mgh and spring PE = ½kx²: solve for energy, mass, height, k or stretch.Power CalculatorCalculate power from work and time, force and velocity, or volts and amps, in W, kW and hp.PPI CalculatorPixel density (PPI), dot pitch and retina viewing distance from resolution and screen size.Download Time CalculatorHow long a file takes to download at your internet speed, or the speed you need.Pressure CalculatorSolve P = F/A for pressure, force or area in Pa, kPa, bar, psi and atm.Work CalculatorSolve W = F·d·cos θ for work, force, distance or angle in J, kWh and ft-lb.Hooke's Law CalculatorSolve F = kx for spring force, spring constant or extension, plus stored spring energy.Centripetal Force CalculatorCentripetal force and acceleration from mass, radius and speed or RPM: F = mv²/r.Gravitational Force CalculatorNewton's law of gravitation F = Gm₁m₂/r² for any two masses, with planet presets.Speed of Sound CalculatorSpeed of sound from air temperature or medium, and distance from an echo or thunder delay.Doppler Effect CalculatorObserved frequency from source and observer speeds, or source speed from a pitch shift.Specific Heat CalculatorSolve Q = mcΔT for heat energy, mass, specific heat or temperature change, with materials.Decibel CalculatorAdd dB levels, convert power or voltage ratios to dB, and find sound level at a distance.Bernoulli Equation CalculatorSolve Bernoulli's equation for pressure, velocity or height, with pipe continuity and flow.Buoyancy CalculatorBuoyant force from fluid density, volume and gravity, with a float or sink check.Escape Velocity CalculatorEscape and orbital velocity for any planet, moon or custom mass and radius.Friction Force CalculatorStatic and kinetic friction from material presets, normal force or mass and incline angle.Inclined Plane CalculatorForces, acceleration and push force for a mass on a slope with friction.Light Travel Time CalculatorHow long light or radio takes to reach the Moon, Sun, Mars, Voyager 1 or any distance.E=mc2 CalculatorConvert mass to energy and back with E=mc², in joules, kWh, eV and tons of TNT.Orbital Period CalculatorOrbital period from central mass and semi-major axis with Kepler's third law and presets.Wind Turbine Power CalculatorWind turbine power output and annual kWh from rotor size, wind speed, air density and Cp.Air Density CalculatorMoist air density in kg/m³ and lb/ft³ from temperature, pressure or altitude, and humidity.Angular Velocity CalculatorFind angular velocity in rad/s, deg/s and RPM from angle and time, RPM or linear speed.Antipode MapFind the exact opposite point on Earth for any place, shown on a dual map with land or ocean.Average Velocity CalculatorAverage speed and average velocity over several trip segments, with displacement and direction.Barometric Pressure TodayCurrent air pressure near you with a rising or falling trend and a 48-hour chart in hPa or inHg.Carbon Dating CalculatorEstimate age from percent carbon-14 remaining or activity, or find C-14 left after any age.Coulomb's Law CalculatorElectrostatic force between two charges, attractive or repulsive; solve for charge or distance.Cpk CalculatorCp, Cpk, Pp, Ppk and ppm out of spec from your data or mean and standard deviation.Crosswind Component CalculatorCrosswind and headwind/tailwind components for any runway and wind, with gusts and a diagram.Drag Force CalculatorAerodynamic or hydrodynamic drag force and power from Cd, frontal area, speed and density.E85 Blend CalculatorHow many gallons of E85 and gas to add to hit a target ethanol blend like E30 or E50.Elastic Collision CalculatorGet final velocities after a 1D elastic collision, with momentum and kinetic energy checks.G-Force CalculatorCalculate g-force from turn speed and radius, a speed change over time, or any acceleration.Heat Transfer CalculatorConduction heat flow in W and BTU/h through one or more layers, with R-value and U-value.Helium Balloon Lift CalculatorHow much a helium balloon lifts in grams and how many balloons you need for a payload.Hydrostatic Pressure CalculatorGauge and absolute pressure at any depth in water, seawater, oil or a custom fluid.Impact Force CalculatorAverage impact force and g-force from mass, drop height or speed, and stopping distance/time.Impulse CalculatorFind impulse from force × time or momentum change, or solve for average force or time.Inverse Square Law CalculatorFind light, sound or radiation intensity at a new distance, or the distance for a target.Lever CalculatorEffort force, load or arm length for class 1, 2 and 3 levers, with mechanical advantage.Lightning Distance CalculatorTap at the flash and again at the thunder to see how far away lightning struck, in miles and km.Magnetic Declination CalculatorFind magnetic declination, inclination and field strength for any place and date (WMM2025).Map Radius ToolDraw circles of any radius around points on a map, with multiple rings and a share link.MTBF CalculatorMTBF, failure rate, availability and mission reliability from operating hours and failures.Pipe Pressure Drop CalculatorDarcy-Weisbach pressure drop and head loss with Reynolds number and Colebrook friction factor.Refrigerant PT ChartPressure-temperature chart for R-410A, R-32, R-454B, R-22, R-134a, R-404A and more.Reynolds Number CalculatorReynolds number and laminar, transitional or turbulent regime for pipes, ducts, plates and spheres.RMS Voltage CalculatorConvert peak, peak-to-peak, RMS and average voltage for sine, square and triangle waves.Spring Rate CalculatorCompression spring rate from wire size, coil diameter, coils and material, plus solid height.
See all 88 Physics Calculators →