ProdCalc is a free, online Material Requirements Planning (MRP) system designed to help manufacturing organizations structure production planning, inventory tracking, and material management in a centralized model.
It can be used to replace spreadsheets in production planning while keeping planning logic clear, traceable, and time-based.
Production Planning Often Starts with Spreadsheets
Spreadsheets are one of the most useful tools in manufacturing operations.
They are flexible, familiar, and accessible. For many companies — and for many production managers — spreadsheets are the practical tool that keeps production planning running day after day.
Production managers often build and maintain complex planning spreadsheets that reflect deep knowledge of materials, processes, and production constraints. These spreadsheets represent experience, discipline, and operational responsibility.
At an early stage, they work well.
As production grows more complex, however, planning becomes harder to maintain manually.
When Spreadsheets Reach Their Limits
As manufacturing operations scale, some structural challenges begin to appear:
- Multiple versions of the same plan
- Manual recalculation of material requirements
- Limited visibility of inventory over time
- Late discovery of material shortages
- No centralized database for planning data
Production planning gradually becomes reactive instead of predictable.
Why This Happens
Production planning is not only about tracking inventory or listing materials.
It requires understanding how material inputs, outputs, inventories, and production orders interact over time.
When this logic lives in spreadsheets, small changes in demand, lead times, or inventory can propagate through the plan without being noticed until production is affected.
This is not a limitation of spreadsheets themselves — it reflects the growing need for a structured planning model.
A Structured Planning Model
Material Requirements Planning (MRP) was created to address exactly this challenge.
MRP connects:
- Material input and output forecasts
- Inventory levels and movements
- Product structures
- Production orders
By organizing these elements in a time-based model, MRP makes material requirements visible before shortages occur and allows production to be planned with greater confidence.
How ProdCalc Is Used
ProdCalc is a free, online system where manufacturing organizations can structure production planning using MRP concepts.
Organizations use ProdCalc to:
- Register materials and product structures
- Define material input and output forecasts
- Track inventory levels and movements
- Create production orders
- Review projected material shortages
Planning data lives in a centralized model, reducing reliance on disconnected spreadsheets.
A Practical Transition
Moving from spreadsheets to structured planning does not need to happen all at once.
Many organizations start by replicating their existing planning logic in a system that can represent material flow consistently over time. From there, planning becomes easier to review, adjust, and trust.
ProdCalc exists to support that transition.
ProdCalc is free for everyone — and will always be.
Start Using ProdCalc
If your production planning is still managed in spreadsheets, you can begin structuring it in an online MRP system today.
Create your free account and start building your organization in ProdCalc: