Free Online Calculators
16 instant tools for finance, business, and maths — with step-by-step workings. No account required, completely free.
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11 Financial Calculators
5 Maths Calculators
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Most Popular
Amortization
Popular
Estimate monthly loan payments based on principal, rate, and term.
Simple Interest
Popular
Compute simple interest and total repayment on a principal amount.
Quadratic Formula
Popular
Solve ax² + bx + c = 0 and find real roots instantly.
Break-Even
Popular
Find units and revenue needed to cover fixed costs and break even.
Derivative
Popular
Differentiate a single-term function using the power rule.
Trigonometry
Popular
Calculate sine, cosine, or tangent for any angle in degrees or radians.
Financial & Business Calculators
Amortization
Free
Estimate monthly loan payments based on principal, rate, and term.
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Annuity
Free
Calculate the present value of a fixed annuity payment stream.
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Break-Even
Free
Find units and revenue needed to cover fixed costs and break even.
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Depreciation
Free
Calculate straight-line depreciation and book value for an asset.
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EOQ
Free
Calculate the Economic Order Quantity to minimise inventory costs.
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Simple Interest
Free
Compute simple interest and total repayment on a principal amount.
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Interest
Free
Calculate both simple and compound interest with flexible inputs.
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Productivity
Free
Calculate labour productivity by output per labor hour.
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Ratios
Free
Compute gross margin, operating margin, and net profit margin.
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Project Evaluation
Free
Estimate project payback period from initial investment and cash flows.
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Inventory Turnover
Free
Calculate inventory turnover ratio and days inventory outstanding.
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Mathematics Calculators
Quadratic Formula
Free
Solve ax² + bx + c = 0 and find real roots instantly.
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GCD & LCM
Free
Find the greatest common divisor and least common multiple of two integers.
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Logarithm
Free
Compute log base b of x using the change of base formula.
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Trigonometry
Free
Calculate sine, cosine, or tangent for any angle in degrees or radians.
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Derivative
Free
Differentiate a single-term function using the power rule.
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