Australia GST Calculator (Add or Remove 10% GST & BAS)
Add 10% GST or calculate the 1/11th GST component backwards from inclusive totals.
Solve ax² + bx + c = 0 with steps.
Paste this into any page — the live tool appears with a credit link back here.
Enter a, b, c and get the discriminant, roots (real or complex), and a step-by-step breakdown.
🔒 This tool runs entirely in your browser. Nothing is uploaded or stored.

Background reading: Quadratic Solver on Wikipedia. More: all calculators.
The equation has no real roots: both solutions are complex numbers. The solver shows them in full instead of erroring.
Yes. Every result includes the step-by-step breakdown from coefficients through discriminant to the final roots.
Explore complementary free web utilities running 100% in your browser:
Add 10% GST or calculate the 1/11th GST component backwards from inclusive totals.
Calculate UK income tax, National Insurance, and take-home pay for 2024/25 & 2025/26.
Calculate time-and-a-half (1.5x), double time (2.0x), and California daily overtime.
Calculate how many pizzas to order for any party, meeting, or group event.
Oct 18, 2026
Three steps, two minutes: exact decimal age, UCSD conversion, breed-size correction. Worked example for a 6.5-year-old Beagle (medium): ln(6.5) ≈ 1.872, times 16 ≈ 30, plus 31 ≈…
Read postOct 17, 2026
Dog years count birthdays; human years map developmental equivalence. A 4-year-old dog has lived 4 dog years and functions like a ~53-year-old human. Same animal, two numbers, two…
Read postOct 17, 2026
The scientifically accurate calculator is the one running 16 × ln(age) + 31 with breed-size correction — currently that description fits a short list headlined by our own…
Read post