Compare calculators

Both calculators run independently — change the inputs on either side to compare results.

Seasonal Demand Forecasting Calculator

Estimate how many units to stock for a given season by combining your baseline sales, seasonal swings, growth trends, and safety buffer. Use it when placing purchase orders ahead of peak or slow periods.

Base Monthly Demand (units)

Seasonal Multiplier

Year-over-Year Growth (%)

Stockout Prevention Buffer (%)

Supplier Lead Time (days)

Fill in the required fields to see your result.

Ecommerce

Marketplace Fee Comparison Calculator

Calculates your net payout after marketplace fees, listing fees, and payment processing charges. Use it when deciding which platform to sell on or pricing a product to protect your margins.

Item Selling Price ($)

Marketplace Platform

Listing Fee ($)

Payment Processing Fee (%)

Fill in the required fields to see your result.

Key differences

	Seasonal Demand Forecasting Calculator	Marketplace Fee Comparison Calculator
Category	Ecommerce	Ecommerce
Inputs required	5	4
Result	Recommended Stock Level (units)	Net Proceeds ($)
What it does	Estimate how many units to stock for a given season by combining your baseline sales, seasonal swings, growth trends, and safety buffer. Use it when placing purchase orders ahead of peak or slow periods.	Calculates your net payout after marketplace fees, listing fees, and payment processing charges. Use it when deciding which platform to sell on or pricing a product to protect your margins.