Increase a Number

The simplest arithmetic move in the world - add one - still has a subtlety hiding in it: numbers get bigger than any pocket calculator wants to admit. 99 becomes 100, and a hundred-digit value needs no float at all, just the ancient discipline of carrying from column to column.

Increase a Number adds one to the value of any number you type, or any amount up to 9,999,999. The arithmetic runs digit by digit, so huge numbers and tricky decimals increase exactly, with no rounding and no drift. Copy or download the result in one click.

• Add one by default: The instant increment - 99 becomes 100, 1000000 becomes 1000001.
• Any amount: Add from 1 up to 9,999,999 in a single step.
• Exact big arithmetic: Digit-by-digit handling keeps huge values exact.
• Decimal aware: Fractions add exactly, keeping their places.
• Carry handled: Overflow grows the number cleanly - 999 to 1000.
• Sign correct: Adding to negatives moves them correctly toward zero.
• Copy or download: Export the increased value for records or next steps.
• Free and private: Everything runs locally; nothing is uploaded or stored.

1. Enter a number - with any sign or decimal part you need.
2. Set the amount - 1 by default, or any value up to 9,999,999.
3. Read the increased result - exact, even for enormous inputs.
4. Copy or download the new value for your records or workflow.

Example 1 - The classic increment. Enter 99, add 1: 100 - the carry makes it grow.

Example 2 - Big amount. Enter 123, add 500: 623.

Example 3 - Huge number. Enter 12345678901234567890, add 1: 12345678901234567891 - exact, no rounding.

Example 4 - Negative. Enter -5, add 1: -4 - moving toward zero.

Example 5 - Decimal. Enter 3.999, add 1: 4.999 - the fraction adds exactly.

• Instant next value: The one-click increment feeds counters, sequences and records.
• Exact at any size: Big-integer arithmetic outperforms float where it matters.
• Any step: Add a little or a lot in one precise move.
• Decimals kept clean: Fraction addition never drifts.
• One-click export: The increased value copies or downloads directly.
• Private and free: All arithmetic stays in the browser; nothing is uploaded or logged.