Coffee Batch Size Scaling Calculator
Created by: Olivia Harper
Last updated:
Scale roast profile checkpoints for new batch sizes while preserving profile intent.
Batch Size Scaling Calculator
CoffeeScale roast profile checkpoints between load sizes
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What is a Batch Size Scaling Calculator?
Why scaling needs structure
A batch size scaling calculator estimates profile adjustments when changing roast load size. It helps you preserve roast style while adapting to production needs.
This is useful for moving from sample, pilot, or partial loads to fuller production batches.
Instead of copying a profile directly and hoping it translates, this approach gives you a documented conversion baseline. That makes team handoffs cleaner and shortens time to a stable production profile.
Scaling Method
Non-linear profile conversion
Scale Factor = Target Batch ÷ Source Batch Adjusted Time = Source Time × Scale Factor^k
The calculator applies practical non-linear exponents to avoid over-scaling, then provides a realistic starting profile.
This protects against common overcorrections where timing gets stretched too far. Treat the output as a first-pass operating plan, then refine from live data and cupping.
Example
6 kg to 12 kg transfer
Increasing from 6 kg to 12 kg often requires moderate charge and timing adjustments, not exact doubling. This tool gives an initial conversion to speed first trial setup.
After the first run, compare first-crack timing and end-of-roast behavior against your source profile. Small iterative changes usually produce better consistency than large one-step corrections.
Applications
Where this helps most
Use this for production scale-up, seasonal throughput shifts, and profile transfer between load plans.
It is especially useful when you must increase throughput quickly without sacrificing cup quality. Teams also use it to create documented playbooks for repeatable load-size transitions.
Tips
Validation workflow
Use scaled outputs as a starting framework, then validate with a controlled test batch and sensory review. Logging charge, airflow, and phase milestones together makes future scaling more accurate.
Validate scaled outputs with cupping before full production rollout.
Track airflow and gas settings with the scaled profile for repeatability.
Frequently Asked Questions
What does batch scaling do?
Batch scaling estimates how roast checkpoints may shift when moving from one charge size to another. It helps convert proven profiles into a practical starting point for new load sizes and reduces setup guesswork when production demand changes.
Will timing scale linearly?
Usually not. Thermal behavior is non-linear, so this calculator applies practical adjustment weighting rather than direct proportional scaling and gives a safer first-trial reference.
Should I keep the same charge temperature?
Not always. Larger loads often require a modest charge increase to maintain early momentum, while smaller loads may need a lower setting to avoid an overly aggressive start.
Can I use this across roaster models?
It is best for scaling within the same machine family. Cross-roaster transfers still need test batches, sensor calibration, and careful comparison of airflow and heat-response behavior.
Sources and References
- SCA roasting references on batch consistency and process scaling.
- Production roasting best-practice resources for profile transfer methodology.