UD5 Toolkit
Recipe Cost Calculator – Price Per Serving & Ingredient
Add ingredients with purchase prices and quantities used to calculate the total cost of a recipe and cost per serving. Perfect for meal prepping on a budget.
Financial Calculators - Money Management
78+ toolsHome Equity Loan & HELOC Payment Calculator
Estimate monthly payments and borrowing capacity for a home equity loan or line of credit. Input your home value, mortgage balance, and credit score range.
Early Auto Loan Payoff Calculator – Save on Interest
Calculate how much you'll save by paying off your car loan early. Add extra monthly or one-time payments and see the new payoff date and total interest saved.
Invoice Late Fee Calculator – Flat Fee & Monthly Interest
Calculate fair late fees on overdue invoices. Set a flat fee, monthly interest rate, or both, and see how much extra your client owes for paying after the due date.
Student Loan Deferment & Forbearance Calculator
See how pausing your student loan payments through deferment or forbearance affects total interest and payoff date. Compare to continued partial payments.
International Stamp Price Calculator – Letter Postage by Country
Calculate the number of stamps or exact postage needed to send a letter or postcard from the US to any other country. Includes USPS Global Forever stamp info.
Cost of Living Comparison – City vs City in US & Abroad
Compare the cost of living between two cities. See how much you'd need to earn in a new city to maintain your current standard of living, broken down by category.
Auto Loan Interest Comparison – 0% vs Rebate Calculator
Compare taking a 0% financing deal versus a cash rebate with a low-interest loan. See the total cost and monthly payment for each option to make a smarter decision.
Rental Property ROI Calculator – Cash Flow & Cap Rate
Analyze the return on investment for a rental property. Input purchase price, rental income, and expenses to calculate cash flow, cap rate, and cash-on-cash return.
Subscription Cleanup Calculator – Track Forgotten Subscriptions
List all your monthly and annual subscriptions to see total yearly spending. Identify unused services and see how canceling them boosts your budget.
Lunch Savings Calculator – Packing vs Buying Lunch
Estimate your potential savings by packing lunch instead of eating out. Enter how often you buy lunch and the average cost to see yearly savings and other uses for that money.
Coffee Savings Calculator – Brew at Home vs Cafe Daily
See how much you could save by making coffee at home instead of buying it daily. Compares annual costs and shows the power of small daily habit changes.
LTV Calculator – Customer Lifetime Value Estimator
Estimate how much revenue an average customer will generate over their entire relationship with your business. Use LTV to optimize marketing spend and retention.
Gross Profit Margin Calculator – Margin & Markup Online
Determine your gross profit margin and markup percentage instantly. Enter cost and revenue to see profit, margin, and markup, plus suggested selling prices for target margins.
FIRE Calculator – Financial Independence Retire Early Simulator
Calculate when you can achieve financial independence and retire early based on your income, savings rate, and expected investment returns. Adjust variables to see different FIRE scenarios.
Emergency Fund Calculator – How Much Should You Save?
Determine your ideal emergency fund target based on your monthly expenses and desired safety buffer. Get a step-by-step plan to build financial security today.
Economic Order Quantity Calculator – Optimal Inventory EOQ
Minimize total inventory costs by calculating the Economic Order Quantity. Enter annual demand, ordering cost, and holding cost for an instant optimal reorder size.
Gas vs Electric Vehicle Savings Calculator – Total Cost of Ownership
Calculate the total cost of ownership between a gasoline car and an electric vehicle. Includes fuel/electricity, maintenance, tax credits, and resale value estimates.
Home Renovation Cost Estimator – Room Remodel Budget
Get rough cost estimates for common home renovation projects including kitchen, bathroom, flooring, and roofing. Input your region and project size for a quick budget number.
Pro Rata Calculator – Prorated Amounts for Partial Periods
Easily compute a prorated amount for a partial billing period. Useful for calculating mid-month rent, partial salaries, subscription refunds, or utility bills.
Streaming Service Cost Comparison – Netflix, Disney+, & More
Compare monthly and annual costs of popular streaming services side by side. Add multiple services to see your total entertainment bill and find the best bundle.
Light Bulb Savings Calculator – LED vs Incandescent
See how much money and energy you can save by switching from incandescent or CFL bulbs to LED. Includes payback period and annual savings estimates.
CD Ladder Calculator – Build a Certificate of Deposit Strategy
Model a CD ladder strategy by mixing CDs with different maturity lengths. See projected returns and liquidity flow to safely grow your savings while maintaining access to funds.
APY to APR Converter – Calculate Effective Annual Rate Online
Quickly convert between Annual Percentage Yield (APY) and Annual Percentage Rate (APR) with compounding frequency. Understand the true cost of loans or real return on savings in a simple online tool.
Compound Frequency Impact Calculator – Daily vs Monthly Compounding
Compare how different compounding frequencies (daily, monthly, quarterly, annually) affect the final amount of your investment or loan. Visualize the power of compound interest.
Rental Yield Calculator – Gross & Net Yield Percentage
Evaluate a rental property by entering purchase price and annual rent to instantly see gross and net rental yield. Factor in expenses for accurate ROI.
Subscription True Cost Calculator – Monthly to Annual
See the annual equivalent of all your monthly subscriptions. Convert weekly and monthly fees to a yearly total – you might cancel a few!
Live Currency Converter – 170+ Currencies & Cryptocurrencies
Convert between 170+ fiat currencies and top cryptocurrencies with live mid‑market exchange rates. No historical charts, just clean conversion.
Coast FIRE Calculator – When Can You Stop Saving?
Find the age at which your existing retirement savings will grow enough to reach your FIRE number without any further contributions. Perfect for planning a career downshift.
No‑Spend Challenge Tracker – Mark Your Frugal Days
Click days on a calendar when you spent nothing. Build a streak and see how many no‑spend days you can achieve in a month.
Mega Millions Payout Calculator – Lump Sum vs Annuity
Calculate the after‑tax payout of a Mega Millions jackpot. Compare the lump‑sum cash value with the 30‑year annuity option, including federal and state tax estimates.
Student Loan Repayment Calculator – Standard vs IDR Plans
Estimate monthly payments under different student loan repayment plans including Standard, Graduated, and Income-Driven Repayment (IDR). Compare total interest paid over time.
Kids Allowance Tracker – Manage Weekly Pocket Money
Track your child's weekly allowance, extra chore earnings, and savings goals. A simple digital ledger to teach money management and the value of saving.
Virtual Savings Jar – Digitally Track Your Fund Goals
Create a visual savings jar for each of your financial goals. Drag coins and notes to fill the jar as you save, and see your progress toward a target amount.
Wishlist Cost Accumulator – Total Your Dream Purchases
Add items to a personal wishlist with their prices to see the total cost. Helps prioritize purchases and set a realistic savings goal for your dream gear.
Wedding Vendor Tip Calculator – Who & How Much to Tip
Enter the cost of each vendor service and see the customary tip range for caterers, photographers, hair stylists, and more. Print the final gratuity list.
Cat Litter Cost per Use Calculator – Clumping, Crystal & Pine
Enter the price and weight of a litter box fill and how long it lasts to calculate daily and monthly cost. Compare different litter types.
Customs Duty Estimator – Import Tax & Tariff Quick Reference
Get a rough estimate of customs duties when importing goods to the US or EU. Input item value, category, and origin to see potential extra costs.
Bi‑Weekly Mortgage Payment Calculator – Save Thousands
Calculate the interest savings and earlier payoff date by switching to bi‑weekly mortgage payments instead of monthly. See the power of an extra annual payment.
Wedding Budget Calculator – Allocate Costs by Category
Plan your wedding spending with a simple percentage-based budget breakdown. Adjust the total budget to see recommended amounts for venue, catering, attire, and more.
Commute Cost Calculator – Gas, Public Transport & Time
Calculate your daily, monthly, and yearly commuting costs by car vs public transit. Factor in fuel, parking, maintenance, and your time to find the smartest option.
International eSIM & Roaming Cost Comparator – Data per Day
Compare the cost of international roaming versus buying a local eSIM or physical SIM for your trip. Input data usage and duration for a total cost estimate.
USD Inflation Calculator – Historical Buying Power
Find out what a dollar amount from a past year is worth today, or vice versa. Uses official US CPI data to show the true impact of inflation over time.
Investment Goal Timeline - Online Reach Your Target
Enter your current savings, monthly contribution, and target amount. Calculate time needed and suggestions. Private.
Currency Code to Symbol Converter - Online ISO 4217 Lookup
Enter a three‑letter currency code like USD or EUR and instantly see the corresponding symbol and number of decimals. Quick developer reference.
Receipt & Expense Logger - Online Simple Finance
Snap or type expense details and store them locally. Categorize and see monthly totals. No cloud, no sign‑up.
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.
Simplified DCF Valuation - Online Stock Intrinsic Value
Estimate the intrinsic value of a stock using a simplified Discounted Cash Flow model with growth rate and discount rate.
NPV Calculator - Online Net Present Value & IRR
Enter cash flows and discount rate to compute Net Present Value and Internal Rate of Return. Finance 101.
Number to English Words - Online Write Out Checks
Enter any number up to trillion and get the English word representation. For filling out checks or legal documents.
Crypto Address Format Checker - Online Validate Wallet
Paste a Bitcoin, Ethereum, or other crypto wallet address and quickly verify its format and checksum. No connection to blockchain.
Itemized Receipt Splitter - Online Who Ordered What?
Assign each receipt item to specific people, then split tax and tip proportionally. Fair group dining payments. All local.
Stock Average Down Calculator - Online Investment Cost Basis
Calculate the new average cost of a stock after buying more shares at a different price. Invest smarter. All local.
Car Loan Calculator - Online Auto Financing & EMI Tool
Estimate monthly car loan payments with trade-in, down payment, and sales tax options. Amortization schedule included. Client-side calculation.
Retirement Calculator - Online Savings & Investment Planner
Project your retirement savings growth with monthly contributions, employer match, and CAGR. Interactive chart. Financial data stays on your device.
Currency Name ↔ Code Converter - Online USD/EUR Lookup
Find the currency code (USD, EUR, JPY) for any country or reverse‑lookup the country from a code. Static reference.
Rule of 72 Calculator - Online Estimate Investment Doubling
See how many years it takes to double your money at a given interest rate using the Rule of 72. Quick financial math.
Currency Converter - Online Exchange Rate (Manual Update)
Convert between currencies using manually updated or default rates. Great for estimation when offline. Local settings.
Envelope Budget Planner - Online Cash Category Allocator
Allocate your monthly income into virtual envelopes by category. Track spending and see remaining balances. LocalStorage.
Loan Calculator - Online EMI & Amortization Schedule Generator
Calculate monthly EMIs for any loan type and see the detailed amortization schedule. Compare different interest rates and tenures with instant results.