Enter the lowest and highest numbers and how many you need. The generator picks whole numbers in that range, each equally likely, with or without repeats: six numbers from 1 to 100 with no repeats, for example. Change the draw number for a new set; the same inputs always give the same set, so a shared link shows the same draw.
My Construction Calculator
Random Number Generator
Inputs
Results update as you type.
Diagram updates as you type.
Results
Check the working before you order.
Your numbers
40, 48, 92, 76, 63, 11
Sorted
11, 40, 48, 63, 76, 92
Sum
330
Chance of any one number
1 in 100
Price This optional: add your own prices
Your prices are remembered on this device only.
Send Order WhatsApp, SMS or email to your supplier
100 possible whole numbers from 1 to 100, each equally likely.
6 drawn, each number at most once (draw number 1).
Pseudo-random: fine for picking, sampling and games, not for passwords, security or official lotteries.
Scan to open this calculationThe code links to this calculator with your inputs, so anyone can scan it with a phone camera and see the same result. Save it for a report, a site board or WhatsApp.Test copy: this code opens the live site, myconstructioncalculator.com, so it works on a phone once the site is launched.
Results are estimates for planning and material ordering only. They are not a substitute for structural design or approval by a qualified engineer. Read the full disclaimer.
Scan to open this calculation with the same inputs.
Generated with myconstructioncalculator.com. Estimates for planning and ordering only; verify against drawings and specifications.
How It Works
Range size = highest − lowest + 1Each draw = lowest + a random whole number from 0 to range size − 1No repeats: a number already drawn is skipped and drawn again
Worked Example
Pick 6 numbers from 1 to 100 with no repeats:
100 possible numbers, each with a 1 in 100 chance
Draw number 1 gives a set of six different numbers
Change the draw number for another set
Chance of a Number Coming Up
Range
Numbers drawn (no repeats)
Chance a given number is picked
1 to 10
1
1 in 10
1 to 100
1
1 in 100
1 to 100
5
1 in 20
1 to 100
10
1 in 10
1 to 1,000
10
1 in 100
Frequently Asked Questions
How do I pick a random number between 1 and 100?
Set the lowest number to 1, the highest to 100 and how many to 1. Each of the 100 numbers has a 1 in 100 chance.
How do I get a new set of numbers?
Change the draw number to 2, 3, 4 and so on. Every draw number gives a different set, and going back to an earlier one gives that set again.
Can I use it to choose samples on site?
Yes. Number the items, such as bags, bars or concrete trucks, and draw the ones to test, so the choice is not biased. Keep the share link as a record of the draw.
Are the numbers truly random?
They come from a well-mixed pseudo-random formula, which is fine for picking, sampling and games. Do not use it for passwords, security or official lotteries.
What does no repeats mean?
Each number can come out only once, like drawing numbered balls from a bag. You cannot ask for more numbers than there are in the range.
Embed This Calculator on Your Website
Free for any website: contractors, suppliers, blogs and schools. Paste this code where you want the calculator to appear. It works in WordPress (Custom HTML block), Wix, Squarespace and plain HTML.
