Best inflation calculators of 2026
7 inflation calculators tested on two jobs: historical ('what is $100 from 1980 worth today?') and forward planning ('what will my $1M be worth in 30 years?'). All historical tools ultimately sit on the same BLS CPI-U data — what differs is precision, direction, and what they let you do with the answer.
Quick comparison
| Tool | Free | No signup | Historical | Future | Monthly CPI | Chart | URL share |
|---|---|---|---|---|---|---|---|
| 1. Snowballr Inflation Calculator | ✓ | ✓ | ✓ | ✓ | — | ✓ | ✓ |
| 2. BLS CPI Inflation Calculator | ✓ | ✓ | ✓ | — | ✓ | — | — |
| 3. in2013dollars (officialdata.org) | ✓ | ✓ | ✓ | ✓ | — | ✓ | ✓ |
| 4. US Inflation Calculator | ✓ | ✓ | ✓ | — | ✓ | — | — |
| 5. SmartAsset Inflation Calculator | ✓ | ✓ | ✓ | ✓ | — | ✓ | — |
| 6. Calculator.net Inflation Calculator | ✓ | ✓ | ✓ | ✓ | ✓ | — | — |
| 7. NerdWallet Inflation Calculator | ✓ | ✓ | ✓ | — | — | — | — |
Detailed reviews
Snowballr Inflation Calculator
Best overall for both directions: historical CPI + future planning
- 100% free, no sign-up, no email collection
- Both modes: what $X from year Y is worth today, and what today's money buys in the future
- Companion inflation-adjusted savings calculator ties inflation to your actual savings plan
- Visual purchasing-power chart
- URL-shareable scenarios
- Historical series is annual CPI-U, not month-precise
- US CPI only — no international indices
BLS CPI Inflation Calculator
Best official source — the reference every other tool derives from
- The Bureau of Labor Statistics' own calculator on its own data
- Month-precise back to 1913
- Zero commercial interest
- Historical only — cannot project forward
- No charts, no context, single-purpose
- Buying-power framing only
in2013dollars (officialdata.org)
Best for deep historical breakdowns by category
- Category-level inflation (food, housing, tuition separately)
- Pre-built pages for any year/amount combination
- Long time series with charts
- Ad-supported with dense pages
- Future projection uses simple extrapolation
- Attribution/methodology takes digging
US Inflation Calculator
Best for current-month CPI news alongside the math
- Updated with each monthly CPI release
- Simple year-to-year conversion
- Companion articles track the latest prints
- Ad-heavy
- No future planning mode
- Basic output
SmartAsset Inflation Calculator
Best forward-planning presentation
- Clean future-value framing
- Adjustable assumed inflation rate
- Readable results
- Advisor lead-gen ecosystem
- Historical mode less precise than BLS
- Limited series transparency
Calculator.net Inflation Calculator
Best configurability for custom assumptions
- Forward and backward with any custom rate
- CPI data mode included
- Reliable arithmetic
- Dated, ad-heavy design
- No visualization
- No category detail
NerdWallet Inflation Calculator
Best beginner explanation wrapped around the math
- Plain-language inflation education
- Simple interface
- Good linked content
- Thin feature set
- Product cross-promotion
- No month precision
How we evaluated
Historical test: $100 from January 1980 — the BLS reference answer is about $384 in today's dollars (roughly 284% cumulative inflation). Every tool on real CPI data should land within a dollar or two. Forward test: $1,000,000 over 30 years at 3% assumed inflation should show purchasing power falling to about $412,000 — only tools with a future mode can answer at all. Points for month-level precision, category breakdowns, and connecting the result to savings decisions; points off for ad density and extrapolation presented as prediction.
Verdict
Keep two tools: BLS for any historical number you plan to publish or cite (it is the primary source, month-precise to 1913), and Snowballr for planning — because the question that actually changes behavior is not what 1980 dollars are worth, but what your retirement number will buy in 30 years, and its inflation-adjusted savings calculator answers exactly that. in2013dollars earns a bookmark for category-level history, where tuition and food tell very different stories than headline CPI.
Frequently asked questions
What is the most accurate inflation calculator?
For historical US numbers, the BLS CPI Inflation Calculator — it runs on the government's own CPI-U series, month-precise back to 1913. Every other tool derives from the same data. For future planning, no tool is 'accurate' — you are choosing an assumption; 3% is the common long-run planning default.
What is $100 from 1980 worth today?
About $384 in current dollars, per BLS CPI-U data — cumulative inflation of roughly 284% since January 1980. Average annual inflation over the period was about 3%.
How much will inflation erode $1 million in 30 years?
At 3% average inflation, $1,000,000 will have the purchasing power of about $412,000 in today's dollars after 30 years. At 4%, only about $308,000. This is why long-term plans should target real (inflation-adjusted) returns — about 7% for stocks historically, not the 10% nominal figure.