Estimate travel time from distance and speed — with optional arrival time and traffic buffer. Add traffic buffers and arrival targets for realistic plans — free, local, no signup.
Plan study hours from syllabus weight and days left — pass with scheduled effort. Turn 5 chapters in 10 days into daily targets — free, local, no signup.
Add hours and minutes to any time — shift schedules, compute end times, total durations. Add 8h30m to 9:00 for shift end — free, local, no signup.
Estimate pages from word count and font size — about 500 words/page at 12pt, 600 at 10pt and under. Font-size-only math, no spacing or margin inputs — free, local, no signup.
Compute running pace and speed from distance and time in km or miles. Check splits for a 5K tune-up — free, local, no signup.
Estimate password crack times from length, charset, and attacker speed — entropy made visceral. Show why 8-char passwords fall in hours — local math, free, no signup.
Distance and speed — arrival time computes instantly. Distance and speed entered — arrival time computes instantly.
Add buffer manually; the math is pure distance-over-speed. Add buffer manually; the math itself is pure distance-over-speed.
Kilometers or miles with matching speed units, your free choice here.
No — calculation runs locally in your browser, free with no signup.
120 km at a steady 60 km/h takes exactly 2 hours — depart 9:00, arrive 11:00. The tool does the same division live and formats the arrival clock time.
Time Duration Calculator
Calculate the exact duration between two times. Handles overnight time spans and displays results in hours, minutes, and seconds. Numbers never leave your device — every calculation runs locally in your browser.
Time Addition Calculator
Add hours and minutes to any time — shift schedules, compute end times, total durations. Add 8h30m to 9:00 for shift end — free, local, no signup.
Last updated October 2026