CSA Share Calculator
Calculate CSA subscription pricing from weekly box value, season length, and member count. Enter values for instant results with step-by-step formulas.
Reviewed by Daniel Agrici, Founder & Lead Developer
Formula
Full Share Price = Weekly Box Value x Season Weeks x (1 - Discount%)
The full share price is determined by calculating the total retail value of all weekly boxes across the season, then applying a member discount. Half shares are priced as a percentage of full shares (typically 55-65%). Total farm revenue is the share price multiplied by member count, and profit is revenue minus production costs.
Worked Examples
Example 1: Standard 24-Week CSA Program
Problem:Weekly box retail value $40, 24-week season, 60 members, 55% production cost, 15% member discount, half shares at 60% of full price.
Solution:Retail season value: $40 x 24 = $960\nFull share price: $960 x (1 - 0.15) = $816\nHalf share price: $816 x 0.60 = $489.60\nTotal revenue (full shares): $816 x 60 = $48,960\nProduction cost: $48,960 x 0.55 = $26,928\nSeason profit: $48,960 - $26,928 = $22,032\nMember weekly savings: $40 - ($816/24) = $6.00/week
Result:Full Share: $816 | Half Share: $490 | Season Profit: $22,032
Example 2: Small Farm Startup CSA
Problem:Weekly box value $30, 20-week season, 25 members, 60% production cost, 10% discount, half shares at 55%.
Solution:Retail season value: $30 x 20 = $600\nFull share price: $600 x (1 - 0.10) = $540\nHalf share price: $540 x 0.55 = $297\nTotal revenue: $540 x 25 = $13,500\nProduction cost: $13,500 x 0.60 = $8,100\nSeason profit: $13,500 - $8,100 = $5,400\nRevenue per week: $13,500 / 20 = $675
Result:Full Share: $540 | Season Revenue: $13,500 | Season Profit: $5,400
Frequently Asked Questions
What is a CSA and how does the share model work?
CSA stands for Community Supported Agriculture, a direct-to-consumer model where community members purchase a share of a farm's harvest before the growing season begins. Members pay upfront or in installments and receive weekly or biweekly boxes of fresh produce throughout the growing season, typically spanning 20 to 30 weeks from late spring through fall. The farmer benefits from guaranteed income and reduced marketing costs, while members receive fresh, local produce at below-retail prices and develop a direct relationship with the grower. CSA shares can be structured as full shares for families, half shares for individuals or small households, and sometimes specialty add-on shares for items like eggs, flowers, or meat.
How do I determine the right price for a CSA share?
Pricing a CSA share requires balancing farm production costs with the value proposition for members. Start by calculating the retail value of a typical weekly box by pricing each item at farmers market or grocery store rates, then multiply by the number of weeks in your season. Most CSA programs offer a 10 to 20 percent discount from retail value to incentivize the upfront commitment, making the subscription attractive compared to weekly shopping. Your share price must cover production costs, labor, overhead, and provide a reasonable profit margin of 25 to 45 percent. Research other CSA programs in your area to ensure your pricing is competitive, as members will compare options when choosing where to subscribe.
How many CSA members do I need to be profitable?
The number of members needed for profitability depends on your fixed costs, variable costs per share, and share price. A small diversified farm with $20,000 in seasonal fixed costs and $300 in variable costs per full share priced at $600 would need at least 67 members to break even (20,000 / (600 - 300) = 67). Most successful CSA operations serve 30 to 150 members, with many finding the sweet spot at 50 to 80 members for manageable workload and consistent box quality. Larger operations serving 200 or more members typically require additional staff, more land, and sophisticated logistics. Start with a modest membership and grow incrementally to ensure you can consistently deliver high-quality boxes.
What should be included in a typical CSA box each week?
A well-curated CSA box typically contains 6 to 10 different items totaling 8 to 12 pounds of produce, varying by season and growing conditions. Early season boxes might include greens, radishes, herbs, and storage crops, while peak summer boxes overflow with tomatoes, peppers, corn, beans, and berries. Box variety is crucial for member satisfaction, and most farms plan successions of plantings to ensure diverse offerings each week. Including a newsletter with recipe suggestions, storage tips, and farm updates enhances the member experience. Some farms offer customization options or swap systems where members can exchange items they dislike, which reduces waste and increases satisfaction but adds logistical complexity to packing.
References
Reviewed by Daniel Agrici, Founder & Lead Developer · Editorial policy