MathPlotter — Calculate. Solve. Visualize.

Your current local time

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From Location

Country / Time Zone

Date

Time

To Location

Country / Time Zone

Date

Time

The selector includes all countries and territories recognised by the time-zone database. Countries such as Australia, Canada, the United States and Russia may use multiple time zones. For accurate conversion, choose the relevant city or regional time zone. Daylight-saving changes are handled automatically by the browser.

Reverse Percentage Calculator

Work backwards from a final amount. Example: if $3,000 includes 15% tax, the original amount is $2,608.70 and the tax component is $391.30.

Amount you have / received

Percentage (%)

Calculation type

Original / base amount

$2,608.70

Percentage component$391.30

Final amount$3,000.00

Formula3000 ÷ 1.15

Age & Date Difference Calculator

Start date / Date of birth

End date

Calculate until today

Exact difference

—

Total days—

Total weeks—

Total hours—

Total minutes—

Total seconds—

Next birthday—

Advanced Scientific Calculator

Angle mode

Memory

Supports arithmetic, powers, roots, trig/inverse trig, logarithms, factorial, percentages, constants and memory.

Interactive Graphing Calculator

Examples: sin(x), cos(x), x^2 - 4*x + 3, sqrt(abs(x)), log(x), 1/x. Move the mouse over the graph to see coordinates. Mouse wheel zooms around the pointer; drag to pan.

🌍 Country Tax Calculator

Estimate resident individual income tax by country, compare yearly and monthly figures, or reverse-calculate gross income from a net amount. A separate GST/VAT mode removes tax from tax-inclusive amounts.

Country / tax system

Amount entered as

Taxable income

↩️ Reverse Income Tax — Net to Gross

Enter the amount you received after estimated income tax. MathPlotter will estimate the gross income and tax difference using the selected country's progressive brackets.

Net amount received

Net amount period

🧾 Reverse GST / VAT / Sales Tax

Use this when an amount already includes a percentage tax. Example: A$3,300 including 10% GST → pre-tax amount A$3,000 and GST A$300.

Tax-inclusive amount

GST / VAT / tax rate (%)

Amount period

Important: Income-tax estimates use simplified resident-individual brackets and do not include every deduction, credit, levy, surcharge, state/provincial tax, social contribution or special rule. GST/VAT rates can also vary by supply. Always verify a final tax position with the relevant tax authority or adviser.