Contract Proration Extractor
Calculate prorated contract values for subscriptions, leases, and service agreements. Enter values for instant results with step-by-step formulas.
Formula
Prorated Amount = (Contract Value / Total Period) × Active Period
Proration divides the total contract value by the full period length, then multiplies by the active portion. Method varies by daily, monthly, or standardized 30-day calculations.
Worked Examples
Example 1: SaaS Mid-Cycle Upgrade
Problem:Customer upgrades from $100/mo to $200/mo plan on March 15. Calculate proration for March (31 days).
Solution:Days remaining: 31 - 14 = 17 days Old plan credit: $100 × (17/31) = $54.84 New plan charge: $200 × (17/31) = $109.68 Net charge for March: $109.68 - $54.84 = $54.84 Plus: Original $100 already charged Total March charge: $100 + $54.84 = $154.84
Result:March charge: $154.84 | Upgrade difference prorated: $54.84
Example 2: Annual Contract Early Termination
Problem:Customer cancels $24,000/year contract after 8 months. Calculate refund using daily proration.
Solution:Contract: $24,000 for 365 days Daily rate: $24,000 / 365 = $65.75 Days used (8 months ≈ 243 days): 243 Days remaining: 365 - 243 = 122 Amount used: $65.75 × 243 = $15,977.25 Refund due: $65.75 × 122 = $8,021.50 Or: $24,000 - $15,977.25 = $8,022.75
Result:Refund: $8,022 | 33% of contract unused
Example 3: Lease Proration
Problem:Tenant moves into $2,400/mo apartment on the 20th. Calculate prorated first month rent.
Solution:Rent: $2,400/month Move-in: 20th of month (31 days) Days occupied: 31 - 19 = 12 days Daily rate: $2,400 / 31 = $77.42 Prorated rent: $77.42 × 12 = $929.03 Alternative (30-day month): Daily rate: $2,400 / 30 = $80.00 Prorated: $80 × 12 = $960.00
Result:Prorated rent: $929 (actual) or $960 (30-day)
Frequently Asked Questions
What is contract proration?
Contract proration is the process of calculating partial payment or credit based on the portion of a contract period actually used. Common in SaaS subscriptions, leases, and service agreements when starting mid-period, canceling early, or changing service levels.
What proration methods exist?
Common methods: Daily (exact days used), Monthly (full/half months), 30-day month (assumes 30 days regardless of actual), Calendar month (based on calendar dates). Choice depends on contract terms and industry practice.
How do I calculate daily proration?
Daily proration: (Contract Value / Total Days) × Actual Days Used. For a $12,000 annual contract: Daily rate = $12,000 / 365 = $32.88. For 100 days: $32.88 × 100 = $3,288.
When is proration applied?
Proration applies during: Mid-cycle start (new customer), Mid-cycle cancellation (refund/credit), Plan upgrades/downgrades, Contract amendments, Partial month billing, and early termination calculations.
What's the difference between proration and amortization?
Proration divides a fixed cost across a time period for billing purposes. Amortization spreads cost recognition over time for accounting purposes. Proration is for invoicing; amortization is for financial reporting.
How do SaaS companies handle proration?
SaaS typically: Pro-rates upgrades immediately (charge difference), Pro-rates downgrades at renewal (credit applied), Uses daily or monthly proration, May offer grace periods, Often applies credits rather than refunds.
What is a proration credit?
A proration credit is the unused portion of a prepaid service that can be applied to future charges. For example, canceling a $100/month service on day 15 generates ~$50 credit for unused days.
How does proration work with annual contracts?
Annual contracts can be prorated daily (365 or 366 days) or monthly (12 periods). Daily is more precise; monthly is simpler. Early termination often requires paying the prorated remainder or forfeiting prepaid amounts.
What about leap years in proration?
For daily proration, leap years have 366 days, affecting daily rate. Some contracts specify 365-day year regardless. The difference is small but can matter for large contracts.
How do I handle partial months?
Options: Prorate by actual days in month, Use 30-day standard month, Charge full month if usage exceeds threshold (e.g., >15 days), or apply company's billing policy. Specify method in contract terms.