The two questions this answers
Students usually arrive at a volunteer hour count with one of two questions, and they need different arithmetic.
"When will I finish?" is the planning question. You know roughly how much time you can give each week and you want to know whether that gets you there. Enter your goal, what you have logged and your weekly pace, and you get a date. If that date lands after the deadline you had in mind, you have found out early enough to do something about it.
"What pace do I need?" is the deadline question, and it is the one people ask in Grade 12. You know when the hours are due and you need to know what that means for your weeks between now and then. Enter the date instead of a pace and you get the hours per week required. Seeing "6.4 hrs/week" is usually the moment a plan becomes realistic.
How the math works
There is nothing clever happening here, which is the point. Hours remaining is your goal minus what you have logged, floored at zero. For a finish date, the remaining hours are divided by your weekly pace, rounded up to whole weeks, and added to today. For a required pace, the remaining hours are divided by the number of weeks between today and your deadline.
Both assume a steady rhythm, which real life is not. Treat the output as a planning figure rather than a promise, and give yourself margin: finishing a requirement a month early costs you very little and removes the risk entirely.
A calculator, not a record
This tool does arithmetic with the numbers you type, in your browser. Nothing is saved and nothing is sent anywhere, so it tells you where you stand today and forgets it. That is fine for a quick check and useless as proof.
When a school or scholarship asks for your hours, they want dates, organizations and a description of what you did, not a total. If you are not keeping that yet, our free log template is a spreadsheet you can copy or download without an account, and how to track your volunteer hours covers the habit around it. If you would rather it were done for you, create a free Volunteerly account and it totals and exports your record as you go.