YAYA JOURNAL · Yaya Blog
Turn hard problems into
steps you can follow
Practical guides for browser tools, debugging, and productivity — with clear steps, real examples, and reusable checklists.
Featured Compound Interest Calculator with Contributions
Estimate compound interest from a principal, nominal annual rate, compounding frequency, and end-of-period contributions. See formulas, examples, and limits.
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Loan Calculator: Monthly Payment, Interest, and Two Methods
Estimate a fixed-rate loan's monthly payment and total interest, then compare level payment with equal principal on the same amount, rate, and full term.
What Grade Do I Need on My Final? Weighted Grade Math
Find what grade you need on your final from weighted scores and leftover course weight. Work a 70% example and see when a 90% target is already out of reach.
Sales Tax Calculator: Add Tax or Remove It From a Total
Learn the two formulas for adding sales tax and backing it out of a tax-inclusive price, with examples and clear limits.
Savings Goal Calculator: Estimate Monthly Savings and Time to Goal
Learn how a savings goal calculator estimates monthly contributions, time to goal, and fixed-rate growth—and where the estimate stops.
Debt Payoff Calculator: Estimate a Monthly Payment and Payoff Time
Use a debt payoff calculator to test one fixed-rate balance, compare payoff time with a monthly payment, and understand the assumptions behind the estimate.
Ratio Calculator Guide: Simplify, Scale, and Split Totals
Learn how to simplify ratios, solve equivalent ratios, and split a total into proportional shares with transparent formulas and examples.
Concrete Calculator: Estimate Yards and Bags for a Slab
Learn how a concrete calculator converts slab dimensions into cubic feet, cubic yards, liters, and a rounded ready-mix bag estimate.
Pace Calculator: Convert Running Pace, Speed, and Finish Time
Use a pace calculator to turn a time and distance into pace, speed, or a steady finish-time estimate in miles and kilometers.
Simple Interest Calculator: Use I = Prt Correctly
Use I = Prt to calculate simple interest. Convert months and days to years, work an $8,000 example, and see when compounding is the wrong model to use.