Free Patent Valuation Calculator
This free patent valuation calculator estimates your patent's market value using the same five-factor model that institutional IP buyers use: technology category (CPC class), forward citation count, remaining patent life, claim scope, and litigation history. Results are calibrated against 652,000 KPSS patent transaction records and returned as a dollar range with a confidence level. No login required.
Free Patent Valuation Calculator
Five inputs. Instant dollar range. No login required.
Find on your patent's face page under “Current CPC Classification”
Search your patent on Google Patents → “Cited by”
20 years from filing date. Check filing date on USPTO
How the Patent Valuation Calculator Works
The patent valuation formula underlying this calculator applies a five-factor weighted model derived from regression analysis of 652,000 KPSS patent transaction records. The model mirrors how institutional patent buyers — operating companies, IP funds, and NPEs — internally value patents before making acquisition offers. The five factors and their approximate weights are:
| Factor | Weight | Why It Matters |
|---|---|---|
| Technology Category (CPC) | ~40% | Determines base value range — AI patents (G06N) command $200K–$900K vs. $50K–$200K for uncategorized |
| Forward Citation Count | ~25% | Each citation adds 15–25% to value — 8 citations = 2–3x more than 0 citations |
| Remaining Patent Life | ~20% | Value decays sharply under 5 years — under 3 years remaining = 5–15% of peak value |
| Claim Scope | ~10% | Broad independent claims covering multiple embodiments = 2x narrow claims |
| Litigation History | ~5% | Asserted patents command 2x premium; active NPE ownership adds 1.5x |
Source: KPSS Patent Value Dataset — Kogan, Papanikolaou, Seru & Stoffman, Quarterly Journal of Economics 2017. 652,000 patent records with estimated market values.
Calculator Inputs Explained
Input 1: Technology Category (CPC Class)
The CPC (Cooperative Patent Classification) code is the international standard for categorizing patents by technology sector. It is the highest-weight input in the calculator (~40%) because it sets the base value range — a semiconductor patent (H01L) starts at $300K–$1.5M while an uncategorized patent starts at $50K–$200K, before any other factors are applied.
Where to find it: On the face page of your patent under “Current CPC Classification” or on Google Patents in the “Classifications” section. The first 4 characters identify the main group (e.g., G06F = computing/software).
Input 2: Forward Citation Count
Forward citations are the number of later patents that cite your patent — a direct measure of its technical influence on subsequent innovations. The KPSS regression shows a 15–25% value increase per citation up to approximately 10 citations, after which the marginal increase plateaus. A patent with 8 citations is typically worth 2–3x more than an identical patent with zero citations.
Where to find it: Search your patent number on Google Patents → scroll down to the “Cited by” section. Or on the USPTO Full-Text Database under “Referenced By.”
Input 3: Remaining Patent Life
US utility patents expire 20 years from the earliest filing date. Remaining life is how many of those 20 years are left. Patent value decays sharply in the final 5 years — a patent with 3 years remaining is worth 5–15% of its peak value because buyers have limited time to assert it or derive licensing revenue before it enters the public domain.
How to calculate: Find your filing date on the USPTO or Google Patents. Subtract the years elapsed from 20. A patent filed April 2012 has a filing date of 2012; remaining life in April 2026 = 20 − 14 = 6 years.
Input 4: Claim Scope
Claim scope refers to the breadth of your patent's independent claims — the claims that define the outermost boundaries of your invention and stand on their own without depending on other claims. Broad independent claims that cover multiple embodiments of an invention (the “what” rather than the “how”) are significantly more valuable than narrow claims tied to a specific implementation. The calculator applies a 2x premium for broad claims over narrow claims.
How to assess: Count your independent claims (those that do not reference another claim). Three or more independent claims covering different embodiments = Broad. One claim covering a specific method = Narrow.
Input 5: Litigation History
Litigation history is the most powerful single multiplier in the model. Patents that have been successfully asserted carry a 2x premium because they have established claim constructions that buyers can rely on. Patents held by active assertion entities (NPEs) carry a 1.5x premium because these owners have the infrastructure and intent to monetize. Patents with no litigation history use a 1.0x baseline.
How to check: Search your patent number on USPTO PTAB for inter partes review proceedings, or use a service like Docket Navigator or RPX to check district court litigation history.
Understanding Your Calculator Result
Estimated Value Range
The dollar range represents the likely market transaction price for your patent, from a conservative (low) to optimistic (high) scenario. The spread reflects natural market variability — actual sale prices cluster within this range for comparable patents.
Quality Score (0–1.0)
Ipiry's composite quality metric derived from citation velocity, claim count, and remaining life. Above 0.7 = strong commercial interest. Below 0.3 = primarily suitable for licensing rather than outright sale.
Confidence Level
High = large KPSS comparable set for this technology category (G06F, G06N, H04L, H04W). Medium = moderate comparables (A61B, G06Q, H01L). Low = smaller comparable set — actual values may deviate more from the estimate.
Primary Value Driver
The single factor contributing most to your estimated value. This tells you which factor to focus on when negotiating — if it's citations, acquiring more citing patents strengthens your position. If it's litigation history, establishing assertion precedent increases value.
Don't Know Your Patent's Data? Here's Where to Find It
If you don't have your CPC code, citation count, or remaining life handy, you can find all of them in under 2 minutes:
- ✓CPC classification codes
- ✓Forward citation count ('Cited by')
- ✓Filing date (to calculate remaining life)
- ✓Claim text (to assess claim scope)
- ✓Official filing date
- ✓Assignment history (current owner)
- ✓Maintenance fee status
- ✓PTAB proceedings (litigation history)
Prefer not to look up the data manually? Use Ipiry's AI valuation tool — enter only your patent number and the AI fetches all five factors automatically from USPTO data in 60 seconds.
Patent Valuation Calculator vs. AI Valuation Tool
| Factor | This Calculator | AI Valuation Tool |
|---|---|---|
| Input required | 5 manual inputs (CPC, citations, life, scope, litigation) | Patent number only |
| Speed | Instant (client-side) | 60 seconds (USPTO data fetch) |
| Data source | Your self-reported inputs | Live USPTO data — auto-fetched |
| Accuracy | ±20–30% (depends on input accuracy) | ±20–25% (actual patent data) |
| Best for | Testing scenarios, no patent number handy | Fastest and most accurate result |
| Cost | $0 | $0 (reports from $99) |
For developers and AI agents:
All five calculator inputs map directly to the POST /api/valuations/generate endpoint parameters.
Agents can submit {patent_number} for automatic factor detection, or {cpc_category, citation_count, remaining_life_years, claim_scope, litigation_history} for manual override. Returns {valuation_min, valuation_max, quality_score, confidence, primary_driver}.
See llms.txt for full API documentation.
Frequently Asked Questions
How does the patent valuation calculator work?
The calculator applies a five-factor weighted model to estimate patent market value: technology category (CPC class) accounts for approximately 40% of the estimate, forward citation count 25%, remaining patent life 20%, claim scope 10%, and litigation history 5%. Each input is weighted against 652,000 KPSS patent transaction records to produce a dollar range and confidence level. The same model powers Ipiry's AI valuation tool.
Is the patent valuation calculator free?
Yes. The Ipiry patent valuation calculator is completely free with no account required. Enter your patent's technology category, citation count, remaining life, and claim scope and receive an instant dollar range estimate. Full reports with comparable transaction data and claim analysis are available for $99–$999.
How accurate is the patent valuation calculator?
The calculator produces estimates with a confidence range of ±20–30% for patents in high-transaction technology categories (G06F, G06N, H04L) where the KPSS comparable set is large. Accuracy decreases for patents in low-transaction categories where fewer comparables exist — the output flags this with a Low confidence rating. The calculator is designed for initial screening, not definitive appraisal.
What is CPC category and how do I find mine?
CPC (Cooperative Patent Classification) is the international patent classification system. Your patent's CPC category is listed on the face of your patent under 'Current U.S. Classification' or 'CPC.' Software patents fall primarily in G06F or G06N. Communications in H04L or H04W. Medical devices in A61B. Semiconductors in H01L. If you're unsure, search your patent number on Google Patents and look for the CPC field.
What are forward citations and where do I find them?
Forward citations are the number of later patents that cite your patent — a measure of your patent's technical influence. Find your forward citation count by searching your patent number on Google Patents or the USPTO Patent Full-Text Database. Look for 'Cited by' or 'Forward Citations.' Each additional forward citation increases estimated value by approximately 15–25% up to 10 citations.
What is remaining patent life?
Remaining patent life is the number of years before your US utility patent expires — calculated as 20 years from your earliest filing date minus the years elapsed since filing. A patent filed in 2010 expires in 2030, giving it approximately 4 years of remaining life as of 2026. Patents with under 5 years remaining trade at 20–40% of their peak value. Check your filing date on the USPTO or Google Patents.
Should I use the calculator or the AI valuation tool?
Use the calculator when you want to manually control each input or test different scenarios. Use the AI valuation tool when you want the fastest result — it requires only your patent number and auto-fetches all five factors from the USPTO database in 60 seconds. The AI tool is more accurate because it uses actual patent data rather than your self-reported inputs.
Can the calculator value a patent portfolio?
The calculator values one patent at a time. For portfolio valuation (10+ patents), use Ipiry's Portfolio Report ($499), which values up to 20 patents simultaneously, ranks them by estimated market value, and identifies which are worth maintaining versus abandoning. Most portfolio owners recover the $499 cost in maintenance fee savings within 12 months.
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