Lean manufacturing · 100% free · no sign-up

The calculator suite
built for the shop floor.

Six precision tools for lean manufacturing and industrial engineering. Enter your numbers, get your answer instantly — no spreadsheets, no accounts, no nonsense.

Browse all calculators About this project →
6
Free calculators
0
Sign-ups required
100%
Browser-based
∞
Calculations
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All calculators
Takt Time
Calculate the production rate required to meet customer demand. Includes line balance analysis and OEE adjustment.
Production rate→
OEE Calculator
Overall Equipment Effectiveness. Multiply Availability × Performance × Quality to benchmark your machine productivity.
Equipment→
Cycle Time Estimator
Break your process into tasks and instantly identify the bottleneck. Supports sequential and parallel flows.
Process flow→
Line Balance Analyzer
Compare each station's cycle time against takt time and calculate your overall line balance efficiency.
Line balance→
EPEI Calculator
Every Part Every Interval — find the minimum scheduling frequency for each part number given capacity and changeover constraints.
Scheduling→
Little's Law
Solve for WIP, throughput, or lead time. Understand the fundamental relationship between inventory and flow rate.
Flow→
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Why factorycalc.io?

No spreadsheets

Stop rebuilding the same Excel files. Open a URL, enter your numbers, get your answer.

No sign-up

Every tool works immediately. No account, no email, no paywall, no trial period.

Runs in your browser

All calculations happen locally. Your production data never leaves your machine.

Built for engineers

Formulas follow lean manufacturing standards and APICS definitions — not simplified approximations.