Free Calculator Widgets for Websites

Pick a calculator below and tap “Copy embed code”.
Paste it into your website’s HTML (WordPress: add a “Custom HTML” block).
Done — it works on phones and computers.

GPA Calculator

Great for: Schools, counselors, student blogs

<iframe src="https://fastonlinecalculator.com/embed/gpa-calculator" width="100%" height="640" style="border:1px solid #e2e8f0;border-radius:14px;max-width:560px;display:block;margin:0 auto;" loading="lazy" title="GPA Calculator"></iframe>
<p style="font-size:12px;color:#64748b;text-align:center;margin-top:6px;">Free <a href="https://fastonlinecalculator.com/calculators/gpa-calculator" target="_blank" rel="noopener">GPA Calculator</a> by <a href="https://fastonlinecalculator.com/" target="_blank" rel="noopener">Fast Online Calculator</a></p>

Final Grade Calculator

Great for: Teachers, classroom sites

Open calculator

<iframe src="https://fastonlinecalculator.com/embed/final-grade-calculator" width="100%" height="640" style="border:1px solid #e2e8f0;border-radius:14px;max-width:560px;display:block;margin:0 auto;" loading="lazy" title="Final Grade Calculator"></iframe>
<p style="font-size:12px;color:#64748b;text-align:center;margin-top:6px;">Free <a href="https://fastonlinecalculator.com/calculators/final-grade-calculator" target="_blank" rel="noopener">Final Grade Calculator</a> by <a href="https://fastonlinecalculator.com/" target="_blank" rel="noopener">Fast Online Calculator</a></p>

Test Grade Calculator

Great for: Teachers, tutoring sites

Open calculator

<iframe src="https://fastonlinecalculator.com/embed/test-grade-calculator" width="100%" height="640" style="border:1px solid #e2e8f0;border-radius:14px;max-width:560px;display:block;margin:0 auto;" loading="lazy" title="Test Grade Calculator"></iframe>
<p style="font-size:12px;color:#64748b;text-align:center;margin-top:6px;">Free <a href="https://fastonlinecalculator.com/calculators/test-grade-calculator" target="_blank" rel="noopener">Test Grade Calculator</a> by <a href="https://fastonlinecalculator.com/" target="_blank" rel="noopener">Fast Online Calculator</a></p>

Percent Error Calculator

Great for: Science & chemistry classes

Open calculator

<iframe src="https://fastonlinecalculator.com/embed/percent-error-calculator" width="100%" height="640" style="border:1px solid #e2e8f0;border-radius:14px;max-width:560px;display:block;margin:0 auto;" loading="lazy" title="Percent Error Calculator"></iframe>
<p style="font-size:12px;color:#64748b;text-align:center;margin-top:6px;">Free <a href="https://fastonlinecalculator.com/calculators/percent-error-calculator" target="_blank" rel="noopener">Percent Error Calculator</a> by <a href="https://fastonlinecalculator.com/" target="_blank" rel="noopener">Fast Online Calculator</a></p>

Algebra Solver

Great for: Math tutors, homework help

Open calculator

<iframe src="https://fastonlinecalculator.com/embed/algebra-solver" width="100%" height="640" style="border:1px solid #e2e8f0;border-radius:14px;max-width:560px;display:block;margin:0 auto;" loading="lazy" title="Algebra Solver"></iframe>
<p style="font-size:12px;color:#64748b;text-align:center;margin-top:6px;">Free <a href="https://fastonlinecalculator.com/calculators/algebra-solver" target="_blank" rel="noopener">Algebra Solver</a> by <a href="https://fastonlinecalculator.com/" target="_blank" rel="noopener">Fast Online Calculator</a></p>

Percentage Calculator

Great for: Any website

Open calculator

<iframe src="https://fastonlinecalculator.com/embed/percentage-calculator" width="100%" height="640" style="border:1px solid #e2e8f0;border-radius:14px;max-width:560px;display:block;margin:0 auto;" loading="lazy" title="Percentage Calculator"></iframe>
<p style="font-size:12px;color:#64748b;text-align:center;margin-top:6px;">Free <a href="https://fastonlinecalculator.com/calculators/percentage-calculator" target="_blank" rel="noopener">Percentage Calculator</a> by <a href="https://fastonlinecalculator.com/" target="_blank" rel="noopener">Fast Online Calculator</a></p>

Currency Converter

Great for: Travel & finance blogs

Open calculator

<iframe src="https://fastonlinecalculator.com/embed/currency-converter" width="100%" height="640" style="border:1px solid #e2e8f0;border-radius:14px;max-width:560px;display:block;margin:0 auto;" loading="lazy" title="Currency Converter"></iframe>
<p style="font-size:12px;color:#64748b;text-align:center;margin-top:6px;">Free <a href="https://fastonlinecalculator.com/calculators/currency-converter" target="_blank" rel="noopener">Currency Converter</a> by <a href="https://fastonlinecalculator.com/" target="_blank" rel="noopener">Fast Online Calculator</a></p>

Mortgage Calculator

Great for: Real estate agents, finance blogs

Open calculator

<iframe src="https://fastonlinecalculator.com/embed/mortgage-calculator" width="100%" height="640" style="border:1px solid #e2e8f0;border-radius:14px;max-width:560px;display:block;margin:0 auto;" loading="lazy" title="Mortgage Calculator"></iframe>
<p style="font-size:12px;color:#64748b;text-align:center;margin-top:6px;">Free <a href="https://fastonlinecalculator.com/calculators/mortgage-calculator" target="_blank" rel="noopener">Mortgage Calculator</a> by <a href="https://fastonlinecalculator.com/" target="_blank" rel="noopener">Fast Online Calculator</a></p>