Time Calculator
Add, subtract, convert, and find durations easily
Time Calculator: Complete Guide to All Modes and Features
Learn how to add, subtract, convert, and measure time with accurate, accessible tools. This guide explains each mode with examples, tips, and best practices.
Add Time
Add Time helps you combine two durations fast, whether you’re planning a schedule, adding up clips in an edit, or totaling billable hours. You can type in whatever feels natural: “1h 30m,” “90m,” “5400s,” or colon styles like “1:30:00.” If you’d rather tap, use the clock inputs to select hours, minutes, and seconds with precision. When you calculate, the result appears in three friendly ways: a clear HH:MM:SS display, the exact total in seconds, and a plain‑language sentence that spells out days, hours, minutes, and seconds. That makes it easy to paste into an email or chat without losing context.
For best results, keep both inputs in a similar style if you’re comparing scenarios, and double‑check that any pasted values include seconds when needed. If you have more than two parts to add, you can run the calculation multiple times, or convert each piece into minutes in the Convert tab and add from there. Labels and hints guide you, errors are written in plain language, and everything works with keyboard and screen readers.
Subtract Time
Subtract Time finds the difference between two durations and presents the answer in a way that’s easy to read and share. You can type “2h 5m 30s,” “125m,” or “2:05:30,” or use the clocks for quick entry on touch devices. The output shows the HH:MM:SS display, total seconds, and a sentence in words (days, hours, minutes, seconds) so non‑technical readers never misinterpret the result.
Use it for timeline edits, workout splits, or keeping projects on track when you need to know what’s left. If the second value is bigger than the first, you’ll see a negative sign and a worded result that also reflects the negative. Errors are easy to spot and fix because they appear next to the related field with plain‑language guidance. Clear resets your entries, and Copy grabs the final answer to share in chat, tickets, or reports.
Duration Between Times
Duration Between Times measures the span from a start to an end with practical options for real‑world schedules. You can type 24‑hour times like “14:20:00,” AM/PM like “2:20 PM,” or select a date and clock for exact cross‑day math. If you only enter times, enable the “end is next day” box to handle overnight shifts gracefully. Results always include the HH:MM:SS display, total seconds, and a spelled‑out sentence (days, hours, minutes, seconds).
This mode is perfect for planning events, tracking shift work, estimating travel windows, or mapping production timelines. When dates are provided, the calculator uses precise calendar arithmetic so spans across days are accurate. Examples below the inputs make formats obvious. Include dates when your timing crosses midnight or more than one day for maximum clarity.
Convert Time Units
Convert Time Units makes translating time values simple and consistent across seconds, minutes, hours, and days. Enter your number, choose the original unit, pick the target unit, and get an instant, legible answer. Alongside the conversion, you’ll also see a worded breakdown into days, hours, minutes, and seconds when that helps communication. This makes it perfect for coordinating teams that use different units, or for reports where readers expect plain language.
Common examples include turning “2 hours” into minutes for shot lists, converting “900 seconds” into minutes for checklists, or summarizing “2.5 days” as a readable multi‑unit breakdown for stakeholders. Watch out for rounding when moving between very large and very small units—the display favors readability, while the copy action gives you a consistent result to paste anywhere.
Find Future or Past Time
Find Future or Past Time starts with a known time (and optional date) and moves by a duration you choose—forward for planning, backward for back‑timing. It’s ideal for reminders, departure plans, meeting schedules, and production steps. Enter the duration in a way that suits you: “1h 45m,” “105m,” or “1:45:00.” Results show the final time clearly and also include the duration in words so the change is easy to understand.
Use the Past toggle to subtract the duration for scenarios like “When should I leave to arrive by 6:30 PM?” Pair this mode with Duration Between Times to confirm lead times across midnight or multi‑day spans. When you have what you need, press Copy to share the output in chat, email, or calendar notes so everyone aligns on the plan.
Accessibility & UX
Inputs are paired with clear labels and helpful hints, while errors appear right next to the field in plain language. Keyboard navigation follows a predictable order, and focus is highlighted so it’s always visible. The layout adapts for small phones and large desktops, with generous touch targets and readable spacing. Color contrast is tuned for legibility.
These practices don’t just help people—they also help search engines understand the page. Semantic headings, landmark regions, and structured data make content scannable and crawlable. Together, these choices create a tool that feels simple the first time you use it and stays reliable day after day.
Tips, Examples, and FAQs
Popular examples
- Add Time: 1h 45m + 35m → 0 days 2 hours 20 minutes 0 seconds.
- Subtract Time: 2:15:30 − 45:15 → 0 days 1 hour 30 minutes 15 seconds.
- Duration: 9:15 AM to 6:05 PM → 0 days 8 hours 50 minutes 0 seconds.
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