Calculators
Decision-support tools for sizing, cost, capacity, runtime, ownership, and other practical planning questions.
Calculate household income as a percentage of a benefit program's stated income limit. Enter monthly household income and the monthly limit for the same household size and period. This comparison does not determine eligibility.
Estimate the average cost per attendee by combining venue costs with per-person food and materials costs. Enter your event's expected attendance and costs to see a planning estimate.
Estimate the total number of seats in a community event layout by multiplying the number of rows by the seats in each row. This estimate assumes every row has the same number of usable seats.
Estimate the total number of supply items needed for a community event from the expected attendee count, items allocated per attendee, and any fixed additional items.
Subtract program, staff, and materials costs from a community grant amount to estimate the funds remaining after these listed budget lines.
Calculate the percentage of invited people who attended a community meeting using attendee and invitation counts.
Estimate a sample proportion's approximate Wald confidence interval using the observed percentage, sample size, and selected z critical value.
Estimate a monthly household cost-of-living budget from housing, household size, and user-entered monthly costs for food, transportation, and other essentials. This is a planning worksheet, not a location price comparison.
Calculate what percentage a demographic group represents of a total population using counts for the group and the whole population.
Compare a measured rate for one group with a reference-group rate to calculate their disparity ratio. Enter both rates in the same units and time period.
Calculate the percentage of districts represented by counting represented districts and dividing by the total number of districts. This simple share assumes both counts use the same district boundaries and reporting period.
Estimate total fundraising from one-time gifts and recurring donations over a selected number of months.
Estimate the direct program output represented by a donation using your own cost-per-unit assumption. The result is an illustrative number of units funded, not a measure of long-term social impact.
Estimate the total value of planned cash and in-kind donations using the amounts and item values you provide. This simple worksheet does not estimate tax benefits or assign market prices to donated goods.
Estimate the number of gifts and total revenue represented by a fundraising pyramid. Set a gift tier, the number of gifts at that tier, and the number of tiers. Each tier below is assumed to have twice as many gifts at half the gift amount.
Calculate the percentage of donors who gave in both a previous period and the current period, using donor counts for those periods.
Estimate voter turnout for an election precinct by dividing ballots cast by registered voters and multiplying by 100. Enter counts from the same precinct and election period.
Calculate the employment rate for a population using the number of employed people and the population base you choose. The result is the employed share of that base, expressed as a percentage.
Compare the representation rate of a group with a reference group using the same population measure. Enter each group's count and total population to calculate the percentage-point gap. This descriptive comparison does not establish why a gap exists or measure equity in every context.
Estimate the net proceeds from a fundraising event by subtracting its direct costs from gross funds raised. Enter amounts in one currency and include only costs you want counted in this event-level estimate.
Estimate the return on a fundraising campaign by comparing net funds raised with campaign costs. Enter the gross amount raised and direct campaign costs to calculate ROI as a percentage. This simple model does not account for timing, restricted funds, or broader organizational impact.
Estimate how much of a fundraising goal has been reached and how much remains using the current amount raised and your target.
Compare the average pay of two groups using the same pay measure and time period. The calculator reports how much lower Group B's average pay is than Group A's, as a percentage of Group A's average pay.
Estimate the Gini coefficient for a simplified population divided into two equally sized groups, using the lower-income group's share of total income.
Estimate the share of monthly household income spent on housing costs using rent or mortgage, utilities, and gross income.
Calculate the percentage change in income between two periods using starting and ending income amounts. The result is a simple comparison and does not adjust for inflation, taxes, or changes in work hours.
Compare two annual household income benchmarks to see how many times larger the higher benchmark is than the lower one. This simple ratio does not measure inequality across an entire population.
Estimate where an annual household income falls within an income distribution by comparing it with the mean and standard deviation you supply. This simplified normal-distribution model returns an estimated percentile, not an official ranking.
Compare two hourly pay rates to see the dollar difference and the percentage difference relative to the reference rate. This simple comparison does not adjust for job, hours, or demographic factors.
Divide a public spending amount by the population it serves to estimate spending per person. This simple comparison uses the spending and population figures you enter and does not adjust for differences in need, service costs, or accounting periods.
Calculate the relative percent change in a group's share of a population between two periods using the starting and ending representation percentages.
Estimate household income as a percentage of a supplied federal poverty guideline. Enter annual household income, household size, and the applicable annual guideline amount per person for your location and year.
Calculate what percentage of a fundraising goal has been reached from the amount raised and the total target.
Calculate the percentage point change between an earlier percentage and a later percentage by subtracting the earlier value from the later value.
Calculate the difference between two percentages in percentage points by subtracting the starting percentage from the ending percentage.
Calculate the average number of people per unit of land area by dividing a population count by the area you enter.
Estimate a population's future size from its current population, annual growth rate, and number of years using a constant compound growth assumption.
Estimate the share of a population living in poverty using the number of people below a poverty threshold and the total population. This is a user-supplied estimate, not an official poverty determination.
Estimate total attendance across public meetings by multiplying the number of meetings by the average number of attendees per meeting. This simple estimate assumes the same average attendance for each meeting.
Compare two hourly wage rates and estimate the percentage difference relative to the reference wage. This simple comparison does not adjust for occupation, hours, experience, or other factors.
Estimate your chance of holding the winning ticket in a raffle when each ticket has an equal chance of being drawn. Enter the total tickets and the number you hold.
Calculate what percentage of your gross monthly income goes toward monthly rent. Enter rent and income in the same currency and time basis.
Calculate the percentage of a group represented within a larger population using the group count and total population. The result describes the share represented in the total you enter.
Compare a comparison group's selection share with a reference group's selection share. Enter each selected share as a proportion from 0 to 1. The reference share must be at least 0.000001 so the ratio is defined.
Estimate a sponsorship package's planning value from audience reach, engagement, deliverable quantity, and a selected exposure factor. This transparent worksheet uses supplied assumptions and is not a quote or guaranteed market price.
Calculate the percentage of eligible survey invitations that resulted in completed responses.
Calculate the unemployment rate from the number of unemployed people actively seeking work and the total labor force. Enter both counts using the same population and time period.
Estimate event supply costs by multiplying the number of volunteers by the supply cost per person, then adding shared supply costs.
Estimate the total volunteer hours contributed by a group over a reporting period using the number of volunteers, hours each volunteer serves per week, and the number of weeks tracked.
Estimate the replacement value of volunteer time using hours contributed, a user-entered hourly benchmark, and a share of time spent on skilled tasks. This is an illustrative worksheet estimate, not cash raised or a valuation of a volunteer's worth.