No wallet, no price feed
Every figure comes from the prices and amounts you enter. Nothing asks for a wallet connection, a key or an account.
8 free tools
Free crypto calculators
Work out profit and loss after fees, your average cost from dollar-cost averaging, staking rewards, impermanent loss, liquidation prices and position size, and Ethereum gas fees. Convert between BTC, sats, ETH, gwei and wei, and check a wallet address for typos. You type the numbers; nothing connects to a wallet.
All 8 run in your browser
Every tool in this category
Sorted A to Z. All free, with no account and no sign-up.
Good to know
How these tools work
Exact arithmetic
Unit conversions and gas fees use whole-number maths down to the wei, so you never see rounding noise such as 0.0006300000000000001.
Fees included
Profit, DCA and liquidation results include trading fees, because fees often decide whether a small trade is worth it.
Questions
Frequently asked questions
Do these tools show live prices?+
No. You enter the prices yourself, which keeps the tools free of third-party data and lets you test any scenario.
Can the address validator tell me if a wallet is safe?+
No. It checks that an address is well formed and that its checksum is correct, which catches typos. It cannot tell who owns an address or whether malware swapped it, so compare the first and last characters before you send.
Is this tax or investment advice?+
No. The calculators are for planning and checking numbers. For tax or investment decisions, speak to a qualified adviser.
Keep exploring
Other categories
Everything runs in your browser, so a signed contract never leaves your computer. Most of these take files up to 75 MB and 500 pages.
Business
Invoices, receipts and quotes print to an A4 PDF straight from the page. The CV maker and Kanban board save as you go, in this browser rather than an account.
Documents
Draw a signature with a mouse, trackpad or finger, or type one, then download it as a transparent PNG, an SVG or a JPG.
Writing and text
Counters for words, characters, syllables and reading time, a text diff, a notepad that saves locally, and a typing test that compares you with the last hour of results.
Images
Nine of these send the image to our server, where it is converted in memory and not kept. The other eight, including HEIC to JPG and the cropper, never upload anything.
Finance
Loans, mortgages, take-home pay, sales tax, tips, a monthly budget and a splitter for shared costs. The budget and the group ledgers are saved in this browser.
Calculators
The biggest section: dates, ages, grades, units, sleep cycles, dice and timers, plus a scientific calculator that handles complex numbers and solves equations.
Developer
JSON, regex, hashes, UUIDs, JWTs and subnets, plus tests for your keyboard, click speed, dead pixels and refresh rate.
Music
A metronome with swing and accents, a pitch pipe, tap tempo, the circle of fifths, and a transposer that reads ChordPro chord sheets.
Audio and video
Check a microphone, speakers or webcam before a call, watch sound on a spectrum analyzer, or record from your webcam. Recordings stay in the tab until you save them.
More focused tools, ready when you are.
Explore the growing collection for calculations, documents, writing, and everyday work.