Tool directory
All tools
Browse every SolveKit utility. Each tool solves one real problem quickly, clearly, and without requiring an account.
Mortgage Calculator
Estimate monthly mortgage payments, total interest, and total repayment cost.
FinanceLoan Calculator
Calculate a loan payment schedule from principal, rate, and term.
FinanceCompound Interest Calculator
Project investment growth with regular compounding and contributions.
FinanceSimple Interest Calculator
Find simple interest and final balance for any principal and term.
FinanceSavings Goal Calculator
Work out the monthly deposit needed to reach a savings target.
FinanceInvestment Return Calculator
Measure investment gain, return percentage, and annualized performance.
FinanceROI Calculator
Calculate return on investment from cost and final value.
FinanceProfit Margin Calculator
Calculate profit, markup, and gross margin from cost and revenue.
FinanceDiscount Calculator
Find the sale price and amount saved after one or two discounts.
FinanceSales Tax Calculator
Add or remove sales tax from any price.
FinanceTip Calculator
Split a bill and tip fairly between any number of people.
FinanceSalary to Hourly Calculator
Convert annual salary into hourly, daily, weekly, and monthly pay.
FinanceHourly to Salary Calculator
Convert an hourly rate into weekly, monthly, and annual earnings.
FinanceBreak-even Calculator
Find how many units you must sell to cover fixed and variable costs.
FinanceCurrency Converter
Convert major world currencies using current reference exchange rates.
FinanceBMI Calculator
Calculate adult body mass index and see the standard weight category.
Health & FitnessCalorie Calculator
Estimate daily calories using the Mifflin–St Jeor equation and activity level.
Health & FitnessMacro Calculator
Split daily calories into protein, carbohydrates, and fat targets.
Health & FitnessBody Fat Calculator
Estimate body fat percentage using the U.S. Navy circumference method.
Health & FitnessIdeal Weight Calculator
Compare several evidence-based adult ideal weight formulas.
Health & FitnessWater Intake Calculator
Estimate a practical daily hydration target from weight and activity.
Health & FitnessRunning Pace Calculator
Convert distance and finish time into pace and average speed.
Health & FitnessPregnancy Due Date Calculator
Estimate a due date and current pregnancy week from the last period.
Health & FitnessOvulation Calculator
Estimate the fertile window from cycle dates and average cycle length.
Health & Fitness