Free Online Calculator Apps for Every Subject

Why Use Browser-Based Calculator Apps Instead of Paid TI-84 Software?

Calc84 offers free browser-based equivalents of the most-used TI-84 Plus CE apps. Texas Instruments sells individual calculator apps for $5 to $15 each. PlySmlt2 for polynomial solving. The Finance app for TVM calculations. Inequalz for inequality graphing. If a student needs all three, that is $30 or more — on top of a $120 calculator. This page gives you browser-based equivalents of those same apps, for free. Same accuracy. Same workflow. Zero cost.

Each app on this page is integrated with the rest of Calc84. After the polynomial root finder gives you roots, click "Store to X,Y" and the values go straight to the graphing calculator to plot. After the system solver finds an intersection point, push it to the grapher for visual confirmation. The periodic table lookup lets you store atomic masses into the calculator memory. These are not isolated widgets — they work together.

Meet the Apps: TVM Solver, Polynomials, Systems & the Periodic Table

TVM Solver (Time Value of Money). This is the app for finance and business math. It handles all five TVM variables: present value (PV), future value (FV), payment (PMT), interest rate (I%), and number of periods (N). Give it any four and it solves for the fifth. Use it for: loan amortization, mortgage comparisons, compound interest projections, car payment calculations. Business finance students use this instead of a $150 financial calculator.

Polynomial Root Finder. This works like the TI-84’s PlySmlt2 app. Enter the coefficients of a quadratic, cubic, or quartic equation, and it returns all roots — both real and complex. Input validation catches common mistakes like entering coefficients in the wrong order. Use it for: Algebra 2 polynomial units, Precalculus, any course where factoring by hand takes too long. Roots are computed directly from the coefficients.

System of Equations Solver. Handles 2×2 linear systems using Cramer's rule with every step shown. The solver warns you when the determinant is zero (no unique solution exists). Use it for: Algebra 1 and 2, any word problem that translates to "two equations, two unknowns." For larger systems, try the matrix calculator with RREF.

Periodic Table. Click any element to see its atomic number, mass, electron configuration, and category. Store atomic masses directly into the calculator for stoichiometry calculations. Use it for: chemistry homework, molar mass calculations, reaction balancing.

For step-by-step walkthroughs of each calculator type, see our TI-84 graphing calculator guide and the TI-84 quadratic formula tutorial.

How Do I Calculate a Loan Payment With the TVM Solver?

Here is a realistic problem: You borrow $15,000 for a car at 4.5% annual interest for 5 years. What is your monthly payment?

1. Set N = 60 (5 years × 12 months per year)
2. Set I% = 4.5 (annual interest rate)
3. Set PV = 15000 (the loan amount — positive because you receive it)
4. Set FV = 0 (you want the loan paid off completely)
5. Set P/Y = 12 and C/Y = 12 (payments and compounding are monthly)
6. Solve for PMT. The answer: about $279.65 per month.

Over 60 months, you pay a total of $279.65 × 60 = $16,779. That means $1,779 in total interest. Try changing the interest rate to 6% and watch the monthly payment jump to $289.99 — a small rate increase costs you $620 more over the life of the loan. This is the kind of "what if" comparison the TVM solver makes easy.

The Free App Lineup at a Glance

• TVM solver — time value of money, loans, mortgages, compound interest (all 5 variables)
• Polynomial root finder — quadratic, cubic, and quartic equations with real and complex roots
• System of equations solver — 2×2 linear systems with step‑by‑step Cramer's rule
• Periodic table lookup — atomic masses, electron configuration, element categories
• Probability simulator — coin flips and dice roll experiments
• Send‑to‑calculator — push any result to the main Calc84 tool for further work
• Built without CAS to align with common SAT policies for 2025‑2026

Page last updated: August 4, 2026

Miqdad Qaisrani

Educational Software Engineer & Creator of Calc84

Miqdad is a full-stack engineer and cybersecurity student specializing in educational technology (EdTech). He built Calc84 to ensure every student has free, instant access to advanced mathematical tools—like TVM solvers and polynomial engines—without having to pay $5–$15 per app on top of expensive physical calculator hardware.

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