maicrositesFree and Pro
Everything that calculates here is free and always will be — no account, no sign-up, no limits on how often you use it. That is not a trial. Search engines send people here to get an answer, and an answer behind a wall is not an answer.
Pro is for what happens around the answer. It remembers your setups on every device you sign in on, turns any result into a page you can send someone, lets you put a tool on your own site, emails you when a date you care about is coming, and takes the ads off every site we run — with one account and one price.
Free
$0forever, no card
Everything that calculates. No account needed.
- Every calculator on every one of our sites, Pro ones included
- Works with no account and no sign-up
- Copy a link to any result and send it
- Email reminders before any date — you pick 7, 3 or 1 day
- CSV, calendar file and clean print — always free
- 3 saved setups and 3 alerts on your own dates
- Shows ads
Pro
$24/ year
$3.99/ month
That is $2 a month. Cancel any time, keep it to the end of the period.
Cancel any time — one click in your account.
- No ads, on every site we run
- 200 saved setups instead of 3, on any device
- 50 email alerts on your own dates instead of 3 — once, or every month
- Turn any result into a public page at our address, with a preview
- Embed a tool on your own site, without our badge
- One account, one price, all our sites — now and every new one
Price excludes tax; the exact total in your currency is shown at checkout.
| Feature | Free | Pro |
|---|---|---|
| Every calculator on the site | ✓ | ✓ |
| Pro tools on this site | ✓ | ✓ |
| Works without an account | ✓ | ✓ |
| CSV / calendar / print export | ✓ | ✓ |
| Copy a link to a result | ✓ | ✓ |
| Reminders before dates on our pages | ✓ | ✓ |
| Embed a tool with our badge | ✓ | ✓ |
| Saved setups, synced across devices | 3 | 200 |
| Email alerts on your own dates | 3 | 50 |
| Ads | shown | none |
| Public page for a result, at our address | — | ✓ |
| Embed without our badge | — | ✓ |
| Covers our other sites too | ✓ | ✓ |
One subscription, all of these
Pro is not per site. Buy it once here and it works on every calculator site we run — the ones below and any we add later.
DaysUntilNow
Free live countdowns — 6 Pro tools
daysuntilnow.com
BTU Sizer
Work out what size air conditioner, heater, fan, dehumidifier… — 6 Pro tools
btusizer.com
CostRunning
Work out what any appliance costs to run — 6 Pro tools
costrunning.com
Before you buy
Does Pro unlock the calculators?
No — and it never will. Every calculator on every one of our sites is free and needs no account, the Pro tools included. Copying a link to a result and getting an email before a date are free too; they are basics, not a product. Pro pays for the ads being gone, for keeping 200 setups and 50 alerts instead of 3, for a public page at our address, and for embedding a tool without our badge.
Does one subscription cover your other sites?
Yes. One account and one price cover every site we run, including the ones we add later. Sign in on any of them with the same email.
How do I cancel?
One click in your account, any time. Pro keeps working until the period you already paid for runs out, then the account goes back to Free — your saved setups stay, you just cannot add more than three.
Can I get my money back?
Within 14 days of buying, yes: press Withdraw from contract in your account and the refund goes back to the card you paid with. That is your right under EU law, not a favour, and we do not ask you to waive it. Refunds and withdrawal
Who takes the payment?
A payment provider acting as the merchant of record. They issue the invoice and handle the tax for your country, so we never see or store your card details. Terms
What happens to my data if I stop paying?
Nothing is deleted. Public share pages go private, saved setups and alerts above the free limit pause, and you can export everything as JSON at any time — including after you cancel.