Everyday Calculators
Dates, tips, grades, passwords and other everyday utilities.
Tip Calculator
Add a tip and split the bill.
Discount Calculator
Sale price after a percentage discount.
Age Calculator
Exact age and days until your next birthday.
Date Calculator
Days between dates, or add/subtract days.
Time Calculator
Add/subtract hh:mm — outputs hh:mm and decimal hours.
Grade Calculator
Weighted average and the grade needed on the final exam.
GPA Calculator
GPA from letter grades and credit hours.
Love Calculator
A bit of fun — deterministic compatibility score from two names.
Password Generator
Strong random passwords — generated client-side, nothing leaves your browser.
Work Hours Calculator
Shift duration minus unpaid break → hours and decimal hours for payroll.
Working Days Calculator
Weekdays only — enter holiday count to subtract bank holidays.
Hours From Now Calculator
Start time defaults to now — override it to add to any time.
Half Birthday Calculator
Half birthdays are a thing for summer-birthday kids — and anyone mid-year milestone-curious.
Countdown Calculator
Pick a target date — get days, weeks and hours remaining.
Time Card Calculator
Shift duration minus unpaid break → hours and decimal hours for payroll.
Time Clock Calculator
Shift duration minus unpaid break → hours and decimal hours for payroll.
Hours Calculator
Add/subtract hh:mm — outputs hh:mm and decimal hours.
Days Between Dates
Days between dates, or add/subtract days.
Weeks Between Dates
Days between dates, or add/subtract days.
Business Days Calculator
Weekdays only — enter holiday count to subtract bank holidays.
What Time Will It Be
Start time defaults to now — override it to add to any time.
Employee Hours Calculator
Shift duration minus unpaid break → hours and decimal hours for payroll.
Payroll Hours Calculator
Shift duration minus unpaid break → hours and decimal hours for payroll.
Weighted GPA Calculator
AP/IB courses get +1.0, honors +0.5 on top of the standard 4.0 points.
Cumulative GPA Calculator
Cumulative GPA = Σ(GPA × credits) ÷ total credits — not a simple average.
Percent Off Calculator
Sale price after a percentage discount.
GPA Calculator (4.0 Scale)
GPA from letter grades and credit hours.
Honors/AP GPA Calculator
AP/IB courses get +1.0, honors +0.5 on top of the standard 4.0 points.
Semester GPA Calculator
Cumulative GPA = Σ(GPA × credits) ÷ total credits — not a simple average.
Concrete Calculator
Volume = L × W × D. Add 10% waste — running short mid-pour is the expensive mistake.
Paint Calculator
Standard emulsion covers ~12m² per litre per coat. Two coats is the default.
Tile Calculator
Area + 10% waste (15% for diagonal laying) → tiles and boxes.
Wallpaper Calculator
UK rolls are 10m × 0.52m — pattern repeats eat into coverage.
Flooring Calculator
Room m² + waste → packs. Laminate/vinyl pack coverage ~2m², carpet sold by the metre.
Concrete Block Calculator
Standard CMU is 440×215mm (UK) / 8×8×16in (US) — count blocks by wall area.
Rebar Calculator
Grid rebar in both directions — 300mm spacing is standard for 100mm slabs.
Ceiling Grid Calculator
Standard 600×600mm (2×2ft) grid — mains at 1.2m, tees between.
Concrete Slab Calculator
Volume = L × W × D. Add 10% waste — running short mid-pour is the expensive mistake.
Paint Coverage Calculator
Standard emulsion covers ~12m² per litre per coat. Two coats is the default.
Tile Estimator
Area + 10% waste (15% for diagonal laying) → tiles and boxes.
Wallpaper Estimator
UK rolls are 10m × 0.52m — pattern repeats eat into coverage.
Carpet Calculator
Room m² + waste → packs. Laminate/vinyl pack coverage ~2m², carpet sold by the metre.
Quikrete Calculator
Volume = L × W × D. Add 10% waste — running short mid-pour is the expensive mistake.
Flooring Estimator
Room m² + waste → packs. Laminate/vinyl pack coverage ~2m², carpet sold by the metre.
Cement Calculator
Volume = L × W × D. Add 10% waste — running short mid-pour is the expensive mistake.
Concrete Driveway Calculator
Volume = L × W × D. Add 10% waste — running short mid-pour is the expensive mistake.
Concrete Cost Calculator
Volume = L × W × D. Add 10% waste — running short mid-pour is the expensive mistake.
Cinder Block Calculator
Standard CMU is 440×215mm (UK) / 8×8×16in (US) — count blocks by wall area.
Carpet Installation Cost Calculator
Room m² + waste → packs. Laminate/vinyl pack coverage ~2m², carpet sold by the metre.
Paint Estimator
Standard emulsion covers ~12m² per litre per coat. Two coats is the default.
Carpet Removal Cost Calculator
Room m² + waste → packs. Laminate/vinyl pack coverage ~2m², carpet sold by the metre.
Tile Installation Cost Calculator
Area + 10% waste (15% for diagonal laying) → tiles and boxes.
Drop Ceiling Calculator
Standard 600×600mm (2×2ft) grid — mains at 1.2m, tees between.
Holiday Entitlement Calculator
Statutory minimum = 5.6 × days worked per week, capped at 28 days. Part-year workers accrue by fraction of year worked.
Holiday Accrual Calculator
Rolled-up holiday: every hour worked accrues 12.07% of an hour as paid leave (the 5.6/46.4 statutory ratio).
Zero Hours Holiday Pay Calculator
Zero-hours workers accrue 12.07% of hours worked as paid holiday — same statutory right as everyone else.
Notice Period Calculator
Statutory minimum: 1 week per full year served, capped at 12. Contracts can demand more — the contract wins if longer.
Holiday Calculator
Statutory minimum = 5.6 × days worked per week, capped at 28 days. Part-year workers accrue by fraction of year worked.
Annual Leave Calculator
Statutory minimum = 5.6 × days worked per week, capped at 28 days. Part-year workers accrue by fraction of year worked.
Holiday Allowance Calculator
Statutory minimum = 5.6 × days worked per week, capped at 28 days. Part-year workers accrue by fraction of year worked.
Holiday Leave Calculator
Statutory minimum = 5.6 × days worked per week, capped at 28 days. Part-year workers accrue by fraction of year worked.
Work Out Holiday Entitlement
Statutory minimum = 5.6 × days worked per week, capped at 28 days. Part-year workers accrue by fraction of year worked.
Pro Rata Holiday Calculator
Rolled-up holiday: every hour worked accrues 12.07% of an hour as paid leave (the 5.6/46.4 statutory ratio).
Holiday Accrual by Hours
Rolled-up holiday: every hour worked accrues 12.07% of an hour as paid leave (the 5.6/46.4 statutory ratio).
Zero Hours Holiday Pay Calculator
Zero-hours workers accrue 12.07% of hours worked as paid holiday — same statutory right as everyone else.
Notice Period Date Calculator
Statutory minimum: 1 week per full year served, capped at 12. Contracts can demand more — the contract wins if longer.
Shipping Cost Calculator
Billable weight = max(actual, volumetric).
Biorhythm Calculator
Physical (23d), emotional (28d), intellectual (33d) cycles today.
Pet Age Calculator
Human-equivalent age for dogs and cats.
Construction Materials Calculator
Concrete, paint and flooring quantities for a job.
Age & Date Calculator
Exact age plus the gap between any two dates.
Compatibility Calculator
A bit of fun — deterministic compatibility score from two names.
Week Counter
Days between dates, or add/subtract days.
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