# Reverse Time Calculator

By Mateusz Mucha
Last updated: Sep 15, 2021
Reverse time calculator tells you how often something happens per unit of time, based on the same thing expressed in a different unit of time.

The reverse time calculator answers a simple question: if something occurs X times per some unit of time, how many times will it happen per different unit? We are using current frequency as a predictor for what happens in the future. In other words, how often this thing occurs is a constant value.

Example: I know that Omni Calculator's website received 45,000 visits from search engines this week. A week is a perfect time unit to measure for us, since the traffic strongly follows a weekly pattern (weekends are quiet, working days are when people come in larger numbers).

While monthly traffic is less interesting for me – a month is a less uniform unit (28-31 days, different number of weekend days, etc.) – I often want to know the number: "how many visits do we have per month"? It comes up in conversations, as it's a base unit of time in many fields, for reasons unknown to me. Why are salaries usually paid per month? Why are services billed monthly?

This calculator lets me enter `45000` in the "/week" field and I immediately know that over the course of an average month, it would mean `195665` visits. Incidentally, before I made this calculator, I would simply use a regular calculator like this: `45000 * 30.5 / 7`, which produces `196071`, which is close enough for my needs.

However, this reverse time calculator completely ignores any growth factor. Use the exponential growth prediction tool to see what some value would be if it grows by a certain percentage in a given period of time.

The compound interest calculator does a similar thing, but it measures something per amount of time, not per unit of time. And finally, the rule of 72 calculator simply tells you how much time something needs to double if it follows an exponential growth pattern.

Mateusz Mucha
/
per year
/
per month
/
per week
/
per day
/
per h
/
per minute
/
per s
People also viewed…

### Body fat

Use the body fat calculator to estimate what percentage of your body weight comprises of body fat. 