Work out charity donation impact instantly with clear inputs, formula shown and shareable results.
Tax relief is added first, overheads are then deducted, and the remainder is divided by the cost of delivering one unit of impact. Tax relief can add a quarter to a gift at no cost to you, which usually outweighs the difference in overhead ratios between comparable charities.
Programme funding
to programme = donation x (1 + tax relief) x (1 - overhead share)
Units funded
units = programme funding / cost per unit
to programme = donation x (1 + tax relief) x (1 - overhead share). Tax relief is added first, overheads are then deducted, and the remainder is divided by the cost of delivering one unit of impact.
Tax relief can add a quarter to a gift at no cost to you, which usually outweighs the difference in overhead ratios between comparable charities.
Enter donation amount, cost to deliver one unit of impact, share spent on overheads, tax relief added to the gift. The defaults shown are a realistic worked example — swap in your own figures to get a result you can use.