Free tools for sending large files
Quick calculators from the HeftySend team. No sign-up, no email, instant results, and every answer is written out in plain English so you can quote it. They work with JavaScript turned off.
File transfer time calculator
How long a file takes to upload or download at a given connection speed, with reference tables from 1 GB to 1 TB.
A 10 GB file on a 100 Mbps connection takes about 13 minutes 20 seconds.
Open calculatorCloud storage egress cost calculator
What storing and serving files costs each month on Amazon S3, Cloudflare R2, Backblaze B2, Wasabi and DigitalOcean Spaces.
500 GB stored and 2 TB downloaded a month: about $7.35 on Cloudflare R2 versus about $182.50 on Amazon S3.
Open calculatorPopular calculations
Straight answers to the transfer-time questions people ask most, each with context, nearby sizes and speeds, and FAQs.
Why these tools
We built HeftySend to send very large files, so the two questions we hear most are "how long will this take?" and "what will it cost to host?". Each calculator answers its question server-side with a stated formula, lists its assumptions, and shows the date its figures were last checked. When you are ready to send, transfers up to 100 GB are free, no account needed, on the HeftySend uploader.