Type your numbers the way you'd scribble them — 32 hrs @ 110,
+18%, split by 4 — and the total updates as you type.
Free, no signup, and nothing you type ever leaves your browser.
Sum & Carry is a plain-text calculator for the math that's too small for a spreadsheet and too fussy for a phone calculator. The kind where you need to see your work, label each line, and change a number without starting over.
A restaurant bill with the tip on
top, a month of shared household bills, or a weekend away where four people
paid for different things. Add the lines, add a percentage, then write
split by 4 to see the per-person share.
Hours at a rate, a rush fee as a percentage, minus the deposit already paid.
Write design work 32 hrs @ 110 and the multiplication happens for
you, so the client sees the same work you did.
Money in as positive lines, money out as negative ones, and the total at the bottom is what's left. Change one number and everything below it updates instantly.
Monthly rental cash flow, a fix-and-flip margin, or a debt service coverage
ratio. Name a line with a colon and reuse it further down —
dscr: noi / annual debt service
There's nothing to learn beyond this. Any line without a number becomes a heading, so you can put notes and section titles in with your numbers.
| You type | What happens |
|---|---|
rent 1200 | Adds 1,200 to the total, labeled “rent” |
deposit -2000 | Subtracts 2,000 |
32 hrs @ 110 | Multiplies a quantity by a rate |
tip +18% | Adds 18% of the running total above it |
vacancy -5% | Takes 5% off the running total |
15% of 4000 | A share of a figure you state yourself |
split by 4 | Shows the running total divided four ways — share between 4, divided by 4 and between 4 people read the same |
budget 1.5k | k and m expand to thousands and millions |
noi: rent - costs | Names a line so you can reuse it below |
Phase two | Any line without numbers becomes a heading |
Worked walkthroughs for the sums people bring here most often. Each one opens the scratchpad with the numbers already in it.
Yes, completely, with no account and no usage limit. The site is paid for by the single advertisement on the page.
No. The whole calculator runs inside your browser as plain JavaScript. There's no server to send anything to, so nothing you type is uploaded, logged or readable by anyone else. Your sheets are kept in your own browser's local storage and stay on your device.
The sheet is encoded into the web address itself. Sending the link sends the work, because the numbers travel inside the URL rather than through a database. That does mean a very long sheet makes a very long link.
It marks a worked-out figure — a named line, a split, or a ratio. Those are shown for reference and never added into the total, so a subtotal can't be counted twice.
Yes. Export will copy the sheet as a plain-text email summary or a Markdown table, or print it to PDF with the totals laid out. It's a scratchpad, not accounting software, so check anything that matters before you send it.
Once the page has loaded, yes — the calculator itself needs no connection. Your saved sheets are already on your device.
Yes, with the selector above the results. It guesses from your browser's region the first time and then remembers your choice. The symbol is display only, so you can also switch it off entirely and work in plain numbers.