Mortgage Overpayment & Amortization Calculator - Online
See how extra monthly or lump‑sum payments reduce your mortgage term and total interest. Dynamic chart. All local calculation.
UD5 Toolkit
| # | Date | Payment | Principal | Interest | Extra | Balance | Cum. Interest |
|---|
See how extra monthly or lump‑sum payments reduce your mortgage term and total interest. Dynamic chart. All local calculation.
Enter total balance and limit to see utilization percentage. See how it affects credit score bands.
Calculate total work hours and pay from time-in/out entries. Supports overtime and breaks. Generate a printable timesheet. All local.
Project your retirement savings growth with monthly contributions, employer match, and CAGR. Interactive chart. Financial data stays on your device.
Approximate monthly child support obligation based on both parents incomes and number of children. Uses simplified model for educational reference. Not legal advice.
Estimate ovulation day and fertility window from last menstrual period. Displays probable conception dates. Informational only; processes locally in browser.
Compare renting to buying a home by entering price, rent, interest, and years. See which saves more. Simplified model.
Enter appliance loads and battery capacity to estimate how long your RV can run without recharging. Local simulation.
Enter wallet size and get the exact length of duct tape strips needed to build a sheet. DIY crafting.
Enter regular hours, hourly rate, and overtime hours to calculate total weekly pay. Follows standard 1.5x rule.
Log daily sleep to see cumulative sleep debt or surplus over weeks. Visualizes chronic sleep loss trends. Stores data locally in your browser only.
Estimate due date from last menstrual period or conception date. Uses Naegele's rule and shows week-by-week milestones. Local calculator for informational use.
Calculate your Basal Metabolic Rate using the Mifflin‑St Jeor equation. Know how many calories you burn at rest. All data private.
Determine the minimum sample size needed for a survey or A/B test with a given confidence level and margin of error.
Check your Body Mass Index using standard or metric units. Get a health category analysis instantly. Educational purpose only; data stays private.
Enter desired pom-pom diameter to estimate yards needed and number of wraps. Quick craft math.
Calculate the exact number of days, weeks, months, and workdays between two dates. Visual calendar highlights. Perfect for projects.
Enter piece count and piece size to estimate finished dimensions. Check if it fits your table.
Estimate calories burned for various activities like running, cycling, swimming based on duration and body weight. Informational and motivational.
Measure your waist‑to‑hip ratio and learn about associated health risks. WHR interpretation. Educational only.
Select an activity, enter your weight and duration, and see the estimated calories burned. Based on MET values.
Add a list of time intervals (hh:mm) and get the total duration instantly. For timesheets or music playlists.
Enter clock-in/out times for each day and see total hours worked, overtime. Calculate weekly pay based on hourly rate. Local storage.
Calculate power supply and controller requirements for any length of LED strip (5050, 2835, WS2812B). Prevents overloading. Local only.
Enter baby's weight in lbs or kg to see suggested diaper sizes across major brands. General reference, no data collected.
Enter rolls remaining and household size to estimate weeks of supply. A humorous yet practical aid.
Enter number of children and see estimated cups, plates, party favors needed. Quick planning tool for birthday parties.
Convert between all major length units: meter, kilometer, mile, yard, foot, inch, and more. Instant results in a clean interface. No registration.
Calculate gear inches, meters of development, and speed ratio for any chainring/cog combination. For cyclists.
Evaluate the strength of your passwords with a visual meter and detailed feedback. Check for length, complexity, and breached passwords. All analysis is client-side.