Finance Calculators
Nine finance tools for real decisions — check a sale price, set a product margin, plan a monthly loan cost, or find the break-even point before you commit. Enter your numbers and results appear immediately.
What these finance tools help you with
- Pricing and margins — work out gross profit as a % of revenue, e.g. $30 cost, $50 price → 40% margin
- Discounts and sale prices — find exact savings and final price, e.g. 25% off $80 → $20 off, $60 final
- Monthly loan cost — calculate repayments and total interest before signing, e.g. $10,000 at 6% over 60 months → $193/month
- Investment returns — measure ROI as a percentage and net gain, e.g. $5,000 invested, $6,200 returned → 24% ROI
- Break-even analysis — find units needed to cover fixed costs before a product launch
- Weighted averages — blend values by their relative importance, e.g. GPA from courses with different credit hours
All finance calculators
Each tool answers a specific financial question. Choose based on what you're trying to find — a price, a payment, a return, or a cost threshold.
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Discount Calculator
Calculate discounted prices and savings instantly.
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Markup Calculator
Calculate selling price from cost and markup percentage.
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Profit Margin Calculator
Calculate gross profit margin for any product or service.
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Sales Tax Calculator
Calculate sales tax and total price including tax.
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ROI Calculator
Calculate return on investment percentage and net gain or loss.
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Simple Interest Calculator
Calculate simple interest and total amount from principal, rate, and time.
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Loan Payment Calculator
Calculate monthly loan payment and total interest for any fixed-rate loan.
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Weighted Average Calculator
Calculate the weighted average from values and their corresponding weights.
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Break-Even Calculator
Calculate break-even point in units and revenue from fixed costs and pricing.
All calculators run instantly in your browser — no sign-up, no data stored.
Common questions
Quick answers to the most common points of confusion between these tools.
What's the difference between markup and profit margin?
Markup is based on cost — a 25% markup on an $80 item adds $20, selling for $100. Profit margin is based on revenue — that $20 profit on $100 revenue is a 20% margin. Same transaction, different denominators.
How do I find total interest paid on a loan?
Enter the principal, annual rate, and term into the loan payment calculator. It shows both the monthly repayment and total interest — for example, $10,000 at 6% over 60 months costs $1,600 in interest. The simple interest calculator gives a faster estimate without monthly compounding.
Can I use the ROI calculator for ad spend or projects?
Yes — the ROI calculator works for any investment with a measurable return. Enter what you spent and what you got back — it returns the percentage gain and net profit regardless of the asset type.