Use the ToolSpilo calculator library to find focused tools with clear inputs, instant results, assumptions, common questions, and related calculators.
Convert ad spend and attributed revenue into ROAS, then read the result next to margin and profit instead of treating revenue as success by itself.
Convert visitors and conversions into a rate you can compare across funnel steps, while keeping the event definition consistent.
Calculate a sale price from the original price and discount percentage, then see the savings and effective discount. Use it for single discounts, stacked promotions, and checking whether a deal is really worth it.
Enter your target take-home income, annual business expenses, tax buffer, and billable hours to find the minimum hourly rate that covers everything. Adjust billable hours per week to see how utilisation changes your rate — or raise the income target to see what rate a salary jump requires.
Enter cost and selling price to see gross profit, profit margin percentage, and markup. The margin bar shows at a glance how much of every revenue dollar is profit. Adjust the selling price to find the price that hits a target margin — or adjust cost to see how supplier negotiations affect your bottom line.
Estimate total wedding cost from guest count, venue, catering per guest, and other costs, then review the budget mix and cost per guest.
Enter the vehicle price, cap cost reduction, residual value, money factor, and lease term to estimate the base monthly lease payment, its depreciation and finance-charge split, and the total amount paid over the contract.
Enter the vehicle price, down payment, trade-in value, interest rate, and loan term to see your monthly payment, total interest, and true vehicle cost including all financing. Adjust the term between 48 and 72 months to see exactly how much extra interest a longer loan generates before you finalize a deal.
Compare a vehicle rebate against a subsidized low-interest offer by entering the vehicle price, cash rebate, both rates, and the loan term. The result shows which offer costs less over the full term and how large the difference is.
Enter a starting value, ending value, and time period to calculate CAGR, total return, and the net gain between the two endpoints.
Enter face value, coupon rate, years to maturity, market yield, and payment frequency to estimate bond price and see whether the bond trades at a premium or discount.
Enter an initial deposit, APY, and term to estimate the balance at maturity and separate your original deposit from the interest earned.
Enter your principal, annual rate, years, and compounding frequency to see your final balance and total interest earned. The growth chart shows the year-by-year split between principal and accumulated interest — the widening gap is the compounding effect.
Solve one time-value-of-money variable at a time: future value, present value, or payment. Enter the remaining values, choose the target field, and use the breakdown to see how starting principal, payments, and growth interact.
Enter a starting amount, annual return, years, and optional monthly contribution to estimate future value, total contributions, and investment growth over time.
Calculate projected future net worth from Income, Savings rate, Expected return, Years, with the key formulas and caveats needed to interpret the result correctly.
Enter a starting amount, annual inflation rate, and time horizon to see its future equivalent cost and how much purchasing power is lost. Adjust the rate between 2% and 8% to compare how apparently small differences in long-run inflation compound into substantial gaps in real purchasing power.
Enter principal, annual rate, time, and compounding frequency to estimate the final balance, interest earned, effective annual rate, and total return from compound growth.
Enter a present value, future value, years, and compounding periods to solve for the nominal annual rate and the effective annual rate implied by that growth.
Project how an initial investment plus monthly contributions could grow over time. Separate what you contribute from what comes from compounding.