Business Tools
Free business calculators for pricing, invoicing and payroll. Work out margin, markup, break-even, late fees and hourly rates in seconds — no sign-up needed.
40 free tools
40 tools
Pricing & profit
Invoice Late Fee Calculator
Calculate the late fee on an overdue invoice free. Enter the amount, days late and monthly or annual rate to get the exact interest and new balance.
Profit Margin Calculator
Free profit margin calculator. Enter cost and price to get gross margin, profit per unit and markup, or work backwards from a target margin to a price.
Markup Calculator
Free markup calculator. Turn cost into a selling price at any markup percentage, and see the margin that markup actually produces. No sign-up needed.
Break Even Calculator
Free break-even calculator. Enter fixed costs, price and variable cost per unit to find your break-even point in units, revenue and contribution margin.
Commission Calculator
Free sales commission calculator: marginal or retrospective tiers, base salary, revenue or gross-profit basis, and draw recovery — see the full payout.
LTV Calculator
Customer lifetime value done right: gross-margin-adjusted LTV with the revenue figure shown beside it, plus LTV:CAC ratio and CAC payback months.
Pay & people
Salary to Hourly Calculator
Convert an annual salary to an hourly, daily, weekly and monthly rate free. Adjust hours per week and paid time off for a realistic effective hourly wage.
Overtime Calculator
Calculate overtime pay at time and a half or double time. Handles the FLSA bonus rule and California daily overtime. Free, no sign-up.
PTO Accrual Calculator
Calculate PTO accrual per hour worked or per pay period, track your balance, and see how a carryover cap causes hours to be forfeited.
Mileage Reimbursement Calculator
Calculate mileage reimbursement using the 2026 IRS rates. Handles the mid-year change from 72.5 to 76 cents, plus medical and charitable rates.
Hourly to Salary Calculator
Convert an hourly wage to annual, monthly and biweekly pay in seconds. Set hours and unpaid weeks off to see the real annual figure behind an offer.
Documents & AI
NDA Generator
Generate a mutual or one-way NDA free. Covers the standard exclusions, survival period and compelled disclosure that free templates skip. No sign-up.
Privacy Policy Generator
Generate a privacy policy that matches your real data practices. Emits the clauses Google requires for AdSense, plus GDPR and CCPA sections. Free.
Refund Policy Generator
Generate a refund policy for goods, digital products or services. Warns when your choices collide with posting laws and the EU 14-day right. Free.
AI Product Description Generator
Free AI product description generator for online stores. Turn product names and features into ready-to-paste copy. Bring your own free API key.
AI Payment Reminder Email Generator
Free AI payment reminder email generator for overdue invoices. Write a polite nudge, firm follow-up or final notice in seconds. Bring your own free API key.
AI Review Reply Generator
Free AI review reply generator for Google, Yelp and Facebook. Turn customer reviews into professional responses in seconds. Bring your own free API key.
Shipping
DIM Weight Calculator
Calculate dimensional (DIM) weight with the 2026 divisors: USPS and UPS/FedEx at 139, express at 5000 cm³/kg. Works in lb/in and kg/cm. Free, no sign-up.
Freight Class Calculator
Find your freight class from density under the NMFC scale effective July 2025. Shows the legacy chart comparison and reclass warnings. Free.
Pallet Calculator
How many boxes fit on a 48×40 pallet? Enter box size to get TI × HI, layers, deck utilization, pallets per shipment and the weight cap. Free, no sign-up.
Marketing
CPM Calculator
Calculate CPM from spend and impressions, see the viewable CPM behind it, and plan what any budget buys. Free, no sign-up, runs in your browser.
CTR Calculator
Calculate click-through rate from clicks and impressions, plan clicks from a CTR, and read the result against typical channel ranges. Free.
Google Ads Budget Calculator
Plan a Google Ads budget with Google's real rules: 30.4× monthly cap, 2× daily overdelivery, clicks, leads, sales and the Smart Bidding floor. Free.
UTM Builder
Build UTM campaign URLs free: source, medium, campaign and content auto-lowercased and underscored so Analytics never splits your traffic. No sign-up.
A/B Test Sample Size Calculator
How many visitors per variant does your A/B test need? Baseline rate, minimum detectable effect, power and significance — the standard two-proportion formula, free.
Target ROAS Calculator
Set target ROAS from your gross margin, not a screenshot: break-even ROAS, the tROAS that leaves real profit per order, and the max CPC that clears it. Free.
Conversion Rate Calculator
Calculate conversion rate free: visitors, conversions and spend to rate, cost per conversion, and the gap to your benchmark — with the funnel-stage trap explained.
Home & property
Mortgage Calculator
Free mortgage calculator with taxes, insurance, PMI and HOA. See the true monthly payment on any home price, plus total interest and payoff months.
Home Affordability Calculator
How much house can you afford? Enter income, debts and down payment to get your price ceiling under the 28/36 rule, with PMI and closing costs.
Rent Increase Calculator
Project a rent increase over up to ten years with full compounding. See the new rent, the yearly path and the total extra paid — caps and notice rules too.
Closing Cost Calculator
Estimate buyer closing costs free: lender fees, title, transfer tax and prepaid escrow, itemized — with the total shown against both the loan and the price.
Property Tax Calculator
Estimate property tax from home value and the effective rate: annual bill, monthly escrow and homestead exemption — with state rates from the Tax Foundation.
Investing
Average Down Calculator
Free stock average-down calculator: weighted cost across multiple buys, all-in break-even with fees, unrealized P/L, and the prices needed for +5% to +50% gains.
Stock Profit Calculator
Free stock profit calculator: net gain after entry and exit fees and capital-gains tax, return on capital, and the break-even exit price — long or short.
Position Size Calculator
Free position size calculator: shares from account size, risk percent, entry and stop — with a position-value cap and a simplified Kelly comparison.
DCA Calculator
Free dollar-cost-averaging calculator: total invested, contribution fees, gain and an approximate annualized return — with the cumulative out-of-pocket schedule.
Building & materials
Concrete Calculator
Concrete calculator for slabs, footings and columns: cubic yards with waste allowance, 80/60/40 lb bag counts, and when to order ready-mix instead.
Paint Calculator
How much paint do I need? Enter room size and openings for gallons at two-coat math — doors and windows deducted, Sherwin-Williams coverage, gallon + quart buying.
Flooring Calculator
How many boxes of flooring do I need? Room area with layout-based waste — 10% straight, 15% diagonal, 20% herringbone — rounded up to whole boxes, with cost.
Tile Calculator
How much tile do I need? Room area, tiles from their inch dimensions, pattern waste — 10% straight, 15% diagonal, 20% herringbone — in whole boxes.
About these tools
Most small-business numbers get worked out once, in a spreadsheet, and then never checked again. Costs drift, a supplier raises prices, wages go up, and the pricing built on last year's figures quietly stops covering them. These calculators exist to make that check take thirty seconds instead of an afternoon.
They cover the four questions that decide whether a business is profitable rather than merely busy: what to charge, what a job actually earns you, how much you need to sell before you are making money, and what an hour of someone's time really costs. Each one shows its working, so you can see which input is moving the answer.
Several tools also have versions written for a specific line of work — restaurant food costing, construction overhead recovery, auto repair parts matrices, contractor rate setting. Those pages carry the benchmarks and conventions of the trade alongside the same calculator, because a 30% margin means something very different in grocery than it does in consulting.
Frequently asked questions
Are these business calculators free?
Yes — every tool has a genuinely useful free tier with no sign-up. The site is funded by advertising, and a few tools offer an optional Pro upgrade for advanced options.
Do my figures get sent anywhere?
Not by the calculators: every calculation runs in your browser using JavaScript, and nothing you type — costs, prices, salaries, invoice amounts — is transmitted or stored. The one exception is the AI product description generator, which sends your product details to the Agnes AI model with your own API key, directly from your browser.
Can I use these for a different currency?
Yes. Each calculator has a currency selector covering USD, EUR, GBP, CAD and AUD. The arithmetic is identical; only the formatting changes.
Is this financial or tax advice?
No. These tools produce estimates for general information. Tax rates, employment rules and interest caps vary by jurisdiction and change over time, so verify anything consequential with a qualified accountant or lawyer.