ToolNestFree Podcast File Size & Bitrate Calculator
Last updated: October 11, 2026
Quick answer: Every podcast host has an upload limit, and every exported episode is a trade-off between bitrate (quality) and file size (storage, bandwidth, upload ceilings). This free podcast file size calculator does the math in both directions: enter an episode length and bitrate to get the exact file size, or enter your host's upload limit and work backward to the longest episode you can publish. Switch to the WAV/PCM tab for exact uncompressed math (sample rate × bit depth × channels), and use the season planner to budget total storage and monthly bandwidth from episodes × downloads. Everything runs in your browser — nothing is uploaded.
Season storage & bandwidth planner
Note: compressed sizes use CBR math, and sizes are shown in binary units (1 MB = 1,024 KB) — the same convention your OS file manager uses. VBR exports usually land 10–20% smaller. WAV/PCM sizes are exact (headers add only ~44 bytes).
✓ Free forever · ✓ No signup · ✓ Tool inputs stay in your browser — never sent to our servers.
How to Use the Podcast Episode Length & File Size Calculator
- Pick a direction: Duration → File size (planning an export) or Host limit → Max length (your host caps uploads at a fixed MB).
- For compressed formats, choose the bitrate preset that matches your show — 64 kbps mono for talk, 96–128 kbps for stereo or music beds — or enter a custom bitrate.
- Enter the episode length (hours/minutes/seconds) or your host's upload limit in MB.
- Switch to the WAV / PCM tab when exporting uncompressed masters — set sample rate, bit depth, and channels for exact sizes.
- Use the season planner to budget: episodes × per-episode size = total storage, plus monthly bandwidth from expected downloads.
Why Use Our Podcast Episode Length & File Size Calculator?
- Podcast-tuned bitrate presets — from 32 kbps voice mono to 320 kbps archival, with the speech settings podcast hosts actually recommend.
- Reverse mode — enter your host's upload limit and get the longest episode you can publish at each bitrate, before you hit record.
- Exact WAV/PCM math — sample rate × bit depth × channels, for masters, stems, and field recordings.
- Season storage & bandwidth planner — episodes × downloads turns into total storage and monthly bandwidth, the two numbers that decide your hosting bill.
- 100% client-side — all math happens in your browser; no audio is uploaded, no account needed.
Common Use Cases
- Pre-recording budget check: Your host caps uploads at 250 MB: reverse mode tells you the longest episode you can export at 128 kbps before you press record.
- Bitrate decisions: Compare 64 kbps mono vs 128 kbps stereo for a 60-minute show and see exactly what the quality jump costs in megabytes.
- Season storage planning: A weekly show's yearly archive: 52 episodes × episode size = the drive space you need, and the bandwidth your host must cover.
- WAV master archiving: Compute exact sizes for 48 kHz / 24-bit masters before buying archive storage — uncompressed math has no surprises.
- Migration between hosts: New host, new upload cap: re-run the numbers to confirm your standard export settings still fit, or pick the bitrate that does.
Podcast Episode Length & File Size Calculator vs Alternatives
- filesize.org's audio calculator: A clean, well-built audio file size calculator with per-minute reference tables and storage-capacity stats. Ours is podcast-specific: speech-tuned bitrate presets, reverse mode from host upload limits, and a season planner that turns episodes × downloads into bandwidth.
- frequencydetector.com's audio duration calculator: A solid two-way calculator with good podcast guidance (including the Opus-vs-MP3 quality point) and a companion spectrum analyzer. Ours adds the season storage + bandwidth planner and exact WAV/PCM mode with 32-bit float support.
- iotools.cloud's audio file size calculator: Thorough, with FLAC estimation, unit-convention honesty (binary vs decimal), and CSV export of the breakdown. Ours trades some of that depth for podcast workflow: presets, reverse mode, and host-limit verdicts in one view.
- Sound Devices' audio calculator (via No Film School): The field-recording classic — BWAV track counts, multi-track math, and storage-to-time in both directions. Ours is aimed at podcast publishing rather than location recording: host limits, episode-length planning, and season bandwidth.
Bottom line: for a quick bitrate-to-size check, any of the tools above works. If you're planning a podcast season — episode length vs. host upload caps vs. bandwidth — this page bundles the whole workflow in one place.
Frequently Asked Questions
How do I calculate a podcast episode's file size?
For compressed formats (MP3, AAC, Opus): size in bytes = (bitrate in kbps × 1,000 ÷ 8) × duration in seconds. A 45-minute episode at 64 kbps mono comes out to about 20.6 MB. For uncompressed WAV: bytes = sample rate × (bit depth ÷ 8) × channels × seconds.
What bitrate should I export my podcast at?
For speech-only shows, 64 kbps mono MP3 is the industry standard — half the size of 128 kbps stereo with no audible difference on voice. Use 96–128 kbps stereo if your show has music beds or sound design. AAC and Opus achieve the same quality at lower bitrates than MP3.
What is the difference between mono and stereo file size?
For compressed formats: none. The bitrate you choose already covers both channels, so a 128 kbps mono file and a 128 kbps stereo file are the same size. For uncompressed WAV, stereo doubles the size — which is why mono masters are standard for talk podcasts.
Why is my uploaded MP3 smaller than this calculator says?
Your encoder probably used variable bitrate (VBR), which spends fewer bits on silence and simple passages. VBR files typically land 10–20% smaller than the constant-bitrate math this tool uses. CBR is the safe estimate when a host enforces a hard upload cap.
How much bandwidth does a podcast season use?
Multiply: file size × episodes × downloads. A 22 MB episode with 12 episodes and 1,000 downloads each moves about 258 GB per month. That math decides whether a host's bandwidth allowance fits your show — the season planner above does it for you.
Do Opus and MP3 at the same bitrate make the same size file?
Essentially yes — file size depends only on bitrate and duration, not the codec. The difference is quality: Opus at 64 kbps sounds cleaner than MP3 at 64 kbps, so Opus lets you hit a smaller size for the same perceived quality.