Add your tasks and a rough estimate for each. The calculator adds a realistic buffer, tells you whether it fits in the time you have — and when you’ll be done.
Free · No sign-up · Saved in your browser
How it works
Write down everything you want to get done today.
Pick 15, 30, 60 or 90 minutes, or type your own estimate.
See the total with a buffer, whether it fits in your available time and when you’ll finish.
Good to know
Most of us plan as if nothing will go wrong. In reality, tasks run over, meetings overrun and messages interrupt. Adding a buffer — 25% is a good starting point — makes your plan realistic instead of optimistic.
The best way to get better at estimating is to compare your estimates with the time things actually take. After a few weeks you’ll know your own patterns, and your plans will start to hold.
FAQ
Start with 25%. If your days usually overrun, try 50%. If you often finish early, reduce it.
Most people manage around four to six hours of focused work in a typical workday, once meetings, messages and breaks are taken into account.
Yes, in your browser only. Nothing is sent to us.
Planzer.io lets you estimate every task, tracks the time you actually spend, and shows estimated vs actual time in Analytics so your estimates improve over time.
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Planzer.io does this for you — connected to your calendar and the tools you already use. Start for free.
