Methodology
How FundiJumla turns your numbers into a price — and what it deliberately does not do.
The core formula
FundiJumla builds up a "loaded cost" from everything you actually spend to produce one unit, then solves backwards for a selling price that protects your target profit margin after selling fees.
Where loaded cost = materials + labour + packaging + overhead + other variable costs, adjusted for waste/failures. Waste is handled as a divisor: if 10% of your output fails (spoilage, breakage or rejects), you must produce roughly 1.11 units to sell one good one, so the cost is divided by (1 − waste %).
Break-even price
This is the price at which profit per unit is zero. Below it, every sale loses money.FundiJumla labels this "Do not sell below".
What FundiJumla does not do
- It does not know the market value of your craftsmanship.
- It does not determine what customers are willing to pay.
- It does not use AI to estimate prices — every result is arithmetic.
- It does not fetch live exchange rates or marketplace fee schedules.
- It does not hardcode "industry standard" pricing or market averages.
- It does not provide accounting, tax, financial or legal advice.
Your responsibility
Results are planning estimates based on the costs and assumptions you enter. You remain responsible for checking your real costs, taxes, platform fees and commercial assumptions. If your selling fee plus target margin reaches 100% or more, no price can satisfy both — FundiJumla will tell you clearly rather than produce a meaningless number.
Decimal safety
All money values are rounded to two decimal places at display time using a round-half-up approach with a floating-point epsilon correction, and percentages are converted to decimals before any division. The engine guards against divide-by-zero and against margin-plus-fee combinations that would make the denominator zero or negative.