Random Number Generator

Generate random numbers, dice rolls, lottery numbers, and more

Random Integers

Minimum:

Maximum:

Quantity:

Unique numbers only

Results:

Click generate to see results

Random Decimals

Minimum:

Maximum:

Quantity:

Decimal Places:

Results:

Click generate to see results

Dice Roller

Number of Dice:

Sides per Die:

Modifier:

Results:

Click roll to see results

Lottery Numbers

Numbers to Pick:

From Range:

To Range:

Sort results

Sets to Generate:

Lucky Numbers:

Click generate to see results

Custom Number Lists

List Type:

Start Value:

Count:

Shuffle results

Generated List:

Click generate to see results

Statistics & History

Generation Stats

Total Generated: 0

Last Range: -

Average: -

Quick Actions

Export Options

Number Types

🔢 Random Integers with custom ranges
🎯 Random Decimals with precision control
🎲 Dice Rolling with modifiers
🎰 Lottery Number Generation
📊 Sequential and Mathematical Series
🔀 Unique number sets

Features

✅ Multiple generation methods
✅ Customizable ranges and quantities
✅ Statistical analysis
✅ Export and copy functions
✅ Preset configurations
✅ Generation history tracking

6. Days Until

What it does: "Days Until" calculates how many days remain until a target date (a birthday, holiday, event). It is essentially a date-difference from today to a future date but often presented with friendly copy and optional recurrence handling for yearly events.

Features

Support recurring yearly events: if the target date this year already passed, compute days until the date next year.

Offer both exact days and a human-friendly format like "2 months and 5 days".

Countdown formatting: allow users to toggle between days-only, weeks + days, or months + days.

Example: Today is 2025-09-24 — Days until 2025-12-25 (Christmas) = 92 days.

Putting it all together — Building reliable web calculators

Here are practical tips for developers and product managers building these tools on websites and mobile apps:

Use tested date libraries. Rely on battle-tested libraries (like Luxon, date-fns, or the native Intl APIs) rather than hand-rolled date math. They handle leap years, daylight saving time, and locale formats.

Validate user input. Provide clear error messages, accept multiple formats, and sanitize all numeric input to avoid parsing errors (commas vs dots in decimals).

Provide educational context. For BMI and loan calculators, include short notes about limitations (BMI) and fees/assumptions (loans) so users understand what the outputs mean.

Accessibility. Make forms keyboard-friendly, support screen readers, and provide visible focus states. Add aria-live regions to announce results to screen reader users.

Performance and privacy. Calculations should occur client-side where possible to reduce latency and avoid storing sensitive input like birth dates or financial figures on servers unless explicitly needed.

Internationalization (i18n). Respect local number and date formats, offer metric and imperial units, and translate messages for broader reach.

Sample HTML form (simplified)

<form id="percentage-form"> <label>Base: <input name="base" type="number" step="any" /></label> <label>Percentage: <input name="percent" type="number" step="any" /></label> <button type="submit">Calculate</button> </form>

Attach client-side JS to compute results instantly and show them inside an accessible result container.

Design & SEO considerations

These calculator pages are highly searchable. Follow these quick SEO tips:

Provide clear titles and meta descriptions (as used in this page).

Use structured data (Schema.org) where appropriate — for example, FAQ schema if you include common questions about the calculators.

Offer shareable results or a printable summary for users who want to save calculations or share with advisors.

Include internal links between calculators (users often transit between percentage calculators, loan calculators and BMI pages).

Conclusion

Age, Percentage, Loan, BMI, Date Difference, and Days Until calculators are simple but powerful tools that deliver immediate value. When implemented carefully — with correct formulas, clear UX, accessibility, and privacy considerations — they can significantly improve user engagement and trust. Developers should prefer reliable libraries for date and numeric handling, clearly document assumptions, and provide helpful explanations so users can understand and act on their results.

If you’d like, I can also provide ready-to-use JavaScript snippets for any of the calculators above (for example, a full amortization table script for the Loan Calculator or a BMI widget with unit toggles). Tell me which one you want first and I’ll include a copy-pasteable implementation.

Random Number Generator

Random Integers

Random Decimals

Dice Roller

Lottery Numbers

Custom Number Lists

Statistics & History

Generation Stats

Quick Actions

Export Options

Number Types

Features

Example algorithm (days)

6. Days Until

Features

Putting it all together — Building reliable web calculators

Sample HTML form (simplified)

Design & SEO considerations

Conclusion